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HomeMy WebLinkAbout2016-05-02 Committee of the Whole Agenda and Reports.pdfCity of Maple Ridge Note: If required, there will be a 15-minute break at 3:00 p.m. Chair: Acting Mayor 1.DELEGATIONS/STAFF PRESENTATIONS – (10 minutes each) 1:00 p.m. 1.1 Festivals Update and Preview •Kathryn Baird, Festivals and Volunteer Coordinate •Yvonne Chu, Arts and Community Connections 2.PUBLIC WORKS AND DEVELOPMENT SERVICES Note: The following items have been numbered to correspond with the Council Agenda: 1101 2016-040-RZ, 12080 228 Street, RS-1 to R-3 Staff report dated May 2, 2016 recommending that Maple Ridge Zone Amending Bylaw No. 7237-2016 to rezone from RS-1 (One Family Urban Residential) to RS-3 (Special Amenity Residential District) to permit future subdivision into 3 single family residential lots be given first reading and that the applicant provide further information as described on Schedule B of the Development Procedures Bylaw No. 5879-1999, along with the information required for an Intensive Residential Development Permit and a Subdivision application. COMMITTEE OF THE WHOLE AGENDA May 2, 2016 1:00 p.m. Council Chamber Committee of the Whole is the initial venue for review of issues. No voting takes place on bylaws or resolutions. A decision is made to send an item to Council for debate and vote or to send an item back to staff for more information or clarification before proceeding to Council. The meeting is live streamed and recorded by the City of Maple Ridge. Note: Owners and/or Agents of Development Applications may be permitted to speak to their applications with a time limit of 10 minutes. Committee of the Whole Agenda May 2, 2016 Page 2 of 4 1102 2015-275-RZ, 23227 Dogwood Avenue, Temporary Use Permit Staff report dated May 2, 2016 recommending that Maple Ridge Official Community Plan Amending Bylaw No. 7176-2015 to permit a temporary parking lot to serve the existing Black Sheep Pub be given second reading and be forwarded to Public Hearing. 1103 2015-361-RZ, Zoning Bylaw Text Amendment, “1 km rule” for Wine Stores in Grocery Stores Staff report dated May 2, 2016 recommending that Maple Ridge Zone Amending Bylaw No. 7190-2015 establishing a 1 kilometre distance rule for all future alcohol beverage retailers in Maple Ridge be given second reading and be forwarded to Public Hearing. 1104 2014-054-SD, 23590 Dogwood Avenue, Local Area Service Bylaw Staff report dated May 2, 2016 recommending that a Local Area Service Bylaw be authorized for enhanced landscape maintenance costs and that Dogwood Ridge Local Area Service Bylaw No. 7246-2016 be given first, second and third readings. 1105 2011-002-RZ, 25608 Bosonworth Avenue, Final One Year Extension Staff report dated May 2, 2016 recommending that a final one year extension be granted for rezoning application 2011-002-RZ to rezone from A-2 (Upland Agricultural) to RS-2 (One Family Suburban Residential) to allow for future subdivision into 3 lots. 1106 2012-102-RZ, 25638 112 Avenue, Final One Year Extension Staff report dated May 2, 2016 recommending that a final one year extension be granted for rezoning application 2012-102-RZ to rezone from RS-3 (One Family Rural Residential) to RS-2 (One Family Suburban Residential) to allow for future subdivision into 4 lots and create 1 remnant RS-3 (One Family Rural Residential) lot. Committee of the Whole Agenda May 2, 2016 Page 3 of 4 1107 Award of Contract ITT-EN16-23: 128 Avenue/Abernethy Way Road and Drainage Improvements (216 Street to 224 Street) Staff report dated May 2, 2016 recommending that Contract ITT-EN16-23, 128 Avenue/Abernethy Way Road and Drainage Improvements (216 Street to 224 Street) be awarded to B & B Contracting (2012) Ltd., that a construction contingency be approved, that the ISL Engineering and Land Services Ltd. contract for Engineering Design Services from 128 Avenue (Abernethy Way) from 210 Street to 224 Street be amended, that the Financial Plan be amended and that the Corporate Officer be authorized to execute the contracts. 1108 North and South Alouette Rivers Additional Floodplain Analysis Phase 2 - Technical Investigations Completion Final Report Staff report dated May 2, 2016 recommending that the “North and South Alouette Rivers Additional Floodplain Analysis Phase 2 - Technical Investigations Completion Final Report” be endorsed. 3. FINANCIAL AND CORPORATE SERVICES (including Fire and Police) 1131 4. COMMUNITY DEVELOPMENT AND RECREATION SERVICES 1151 Award of Contract, 2016/2017 Mowing Services Staff report dated May 2, 2016 recommending that the Option “B” proposal for mowing services for 2016 from Horizon Landscape Contractors be approved. 5. ADMINISTRATION 1171 Joint Airport Mediation Next Steps Strategy Staff report dated May 2, 2016 providing information on joint meetings between the City of Maple Ridge and the City of Pitt Meadows with respect to the airport and Parks and Recreation Services. 6. CORRESPONDENCE 1181 Committee of the Whole Agenda May 2, 2016 Page 4 of 4 7. OTHER ISSUES 1191 8. ADJOURNMENT 9. COMMUNITY FORUM Checked by:________________ Date: ________________ COMMUNITY FORUM The Community Forum provides the public with an opportunity to speak with Council on items that are of concern to them, with the exception of Public Hearing by-laws that have not yet reached conclusion. Each person will be permitted 2 minutes to speak or ask questions (a second opportunity is permitted if no one else is sitting in the chairs in front of the podium). Questions must be directed to the Chair of the meeting and not to the individual members of Council. The total time for this Forum is limited to 15 minutes. If a question cannot be answered, the speaker will be advised when and how a response will be given. Council will not tolerate any derogatory remarks directed at Council or staff members. Other opportunities are available to address Council including public hearings and delegations. The public may also make their views known to Council by writing or via email and by attending open houses, workshops and information meetings. Serving on an Advisory Committee is an excellent way to have a voice in the future of this community. For more information on these opportunities contact: Clerk’s Department at 604-463-5221 or clerks@mapleridge.ca Mayor and Council at mayorandcouncil@mapleridge.ca City of Maple Ridge TO: Her Worship Mayor Nicole Read MEETING DATE: May 2, 2016 and Members of Council FILE NO: 2016-040-RZ FROM: Chief Administrative Officer MEETING: C of W SUBJECT: First reading Zone Amending Bylaw No. 7237-2016 12080 228 Street EXECUTIVE SUMMARY: An application has been received to rezone the subject property, located at 12080 228 Street, from RS-1 (One Family Urban Residential) to R-3 (Special Amenity Residential District) to permit future subdivision into 3 single family residential lots. To proceed further with this application additional information is required as outlined below. Due to its location within the Town Centre, this application is exempt from the Community Amenity Contribution Program. RECOMMENDATIONS: That Zone Amending Bylaw No. 7237-2016 be given first reading; and That the applicant provides further information as described on Schedule B of the Development Procedures Bylaw No. 5879–1999, along with the information required for an Intensive Residential Development Permit and a Subdivision application. DISCUSSION: a)Background Context: Applicant: Baljinder Sidhu Owner: Baljinder Sidhu Legal Description: Lot: 302, Section 20, Township 12, New Westminster District Plan 44858 OCP: Existing: Single Family Residential Zoning: Existing: RS-1 (One Family Urban Residential) Proposed: R-3 (Special Amenity Residential District) Surrounding Uses: North: Use: Single Family Residential Zone: RS-1 (One Family Urban Residential) Designation: Single Family Residential South: Use: Single Family Residential Zone: RS-1 (One Family Urban Residential) Designation: Ground Oriented Multi-Family 1101 - 2 - East: Use: Single Family Residential Zone: RS-1 (One Family Urban Residential) Designation: Single Family Residential West: Use: Multi-family Residential Zone: RM-2 (Medium Density Apartment Residential) Designation: Low Rise Apartment Existing Use of Property: Residential Proposed Use of Property: Residential Site Area: 0.104 HA. (0.25 acres) Access: 228 Street Servicing requirement: Urban Standard b)Site Characteristics: The subject property is approximately 0.104 ha. (0.25 acres) in size, is generally flat, and is bound by single family residential properties to the north, east and south, with 228 Street and a condominium complex to the west (see Appendix A and B). c)Project Description: The current application proposes to rezone the subject property from RS-1 (One Family Urban Residential) to R-3 (Special Amenity Residential District) to permit future subdivision into three lots and a lane in the back. The proposed lots will be a minimum of 286 m2 and the lane is proposed to be 6.9m wide on this property, leaving 0.6m to be integrated into the lane during development of the adjacent property 12081 Greenwell Street. A temporary Statutory Right-of-Way will be required to get registered over the proposed middle lot, to establish temporary access to the rear lane, until such time an adjacent property is developing and providing access. This proposal is consistent with the other development applications in the block, and aligns with the concept plan envisioned for this block. At this time the current application has been assessed to determine its compliance with the Official Community Plan (OCP) and provide a land use assessment only. Detailed review and comments will need to be made once full application packages have been received. A more detailed analysis and a further report will be required prior to second reading. Such assessment may impact proposed lot boundaries and yields, OCP designations and Bylaw particulars, and may require application for further development permits. d) Planning Analysis: Official Community Plan: The subject property is designated Single Family Residential in the Town Centre Area Plan, Section 10.4 of the OCP. This designation provides options for increasing density and choice of housing form, while retaining the single-family character in established neighbourhood blocks. The R-3 (Special Amenity Residential District) zone is compatible with this designation. Furthermore, the current proposal is consistent with the following policies of the Town Centre Area Plan: Policy 3-17 To enable some densification in areas designated for Single-Family Residential, Maple Ridge will consider: a.A Detached Garden Suite, subject to consistency with the Maple Ridge Detached Garden Suites policy; - 3 - b. A Secondary Suite within a principle single-family use dwelling, subject to consistency with the existing Maple Ridge Secondary Suite Bylaws. c. Lot size of 213 m2 to 370m2 is permitted, where vehicle access is from a rear lane only… Policy 5-9 Maple Ridge will encourage the retention of laneways and the creation of new laneways should be considered, where appropriate and feasible. The proposal as submitted complies with the intent of the OCP. Community Amenity Contribution Program: On March 14, 2016, Council approved the Community Amenity Contribution Program Policy. As stated in Section 3 of the policy, properties within the Town Centre Area Plan boundaries are exempt from the CAC Program (except where Council applies the provisions of Section 8 of the policy, where applications seeking an extension under Development Procedures Bylaw No. 5879-1999, may be subject to the city-wide community amenity contribution program at the discretion of Council). Zoning Bylaw: The current application proposes to rezone the property located at 12080 228 Street from RS-1 (One Family Urban Residential) to R-3 (Special Amenity Residential District) to permit future subdivision into three lots and a lane in the back. The minimum lot size for the current RS-1 (One Family Urban Residential) zone is 668m2, and the minimum lot size for the proposed R-3 (Special Amenity Residential District) zone is 213 m2. Any variations from the requirements of the proposed zone will require a Development Variance Permit application. Development Permits: Pursuant to Section 8.8 of the OCP, an Intensive Residential Development Permit application is required to ensure the current proposal provides emphasis on high standards in aesthetics and quality of the built environment, while protecting important qualities of the natural environment. e) Interdepartmental Implications: In order to advance the current application, after first reading, comments and input, will be sought from the various internal departments and external agencies listed below: a) Engineering Department; b) Fire Department; c) Building Department; d) School District; e) Utility companies; and f) Canada Post. The above list is intended to be indicative only and it may become necessary, as the application progresses, to liaise with agencies and/or departments not listed above. This application has not been forwarded to the Engineering Department for comments at this time; therefore, an evaluation of servicing requirements has not been undertaken. This evaluation will take place between first and second reading. - 4 - f)Development Applications: In order for this application to proceed the following information must be provided, as required by Development Procedures Bylaw No. 5879–1999 as amended: 1.A complete Rezoning Application (Schedule B); 2.An Intensive Residential Development Permit Application; and 3.A Subdivision Application. The above list is intended to be indicative only, other applications may be necessary as the assessment of the proposal progresses. CONCLUSION: The development proposal is in compliance with the OCP, therefore, it is recommended that Council grant first reading subject to additional information being provided and assessed prior to second reading. The proposed layout has not been reviewed in relation to the relevant bylaws and regulations governing subdivision applications. Any subdivision layout provided is strictly preliminary and must be approved by the City of Maple Ridge’s Approving Officer. “Original signed by Therese Melser”_______________ Prepared by: Therese Melser Planning Technician “Original signed by Christine Carter”________________ Approved by: Christine Carter, M.PL, MCIP, RPP Director of Planning “Original signed by Christine Carter”______________for_ Approved by: Frank Quinn, MBA, P. Eng GM: Public Works & Development Services “Original signed by E.C. Swabey”____________________ Concurrence: E.C. Swabey Chief Administrative Officer The following appendices are attached hereto: Appendix A – Subject Map Appendix B – Ortho Map Appendix C – Zone Amending Bylaw No. 7237-2016 Appendix D – Proposed Subdivision Plan DATE: Feb 22, 2016 2016-040-RZ BY: JV PLANNING DEPARTMENT SUBJECT PROPERTY DEWDNEY TRUNK ROAD ´ Scale: 1:1,500 12080 228 Street 2011 ImageLegend Indefinite Creek River Centreline Major Rivers & Lakes APPENDIX A DATE: Feb 22, 2016 2016-040-RZ BY: JV PLANNING DEPARTMENT SUBJECT PROPERTY DEWDNEY TRUNK ROAD ´ Scale: 1:1,500 12080 228 Street 2011 Image Aerial Imagery from the Spring of 2011 Legend Indefinite Creek Major Rivers & Lakes APPENDIX B CITY OF MAPLE RIDGE BYLAW NO. 7237-2016 A Bylaw to amend Map "A" forming part of Zoning Bylaw No. 3510 - 1985 as amended ______________________________________________________________________________ WHEREAS, it is deemed expedient to amend Maple Ridge Zoning Bylaw No. 3510 - 1985 as amended; NOW THEREFORE, the Municipal Council of the City of Maple Ridge enacts as follows: 1.This Bylaw may be cited as "Maple Ridge Zone Amending Bylaw No. 7237-2016." 2.That parcel or tract of land and premises known and described as: Lot 302 Section 20 Township 12 New Westminster District Plan 44858 and outlined in heavy black line on Map No. 1671 a copy of which is attached hereto and forms part of this Bylaw, is hereby rezoned to R-3 (Special Amenity Residential District). 3.Maple Ridge Zoning Bylaw No. 3510 - 1985 as amended and Map "A" attached thereto are hereby amended accordingly. READ a first time the day of , 20 READ a second time the day of , 20 PUBLIC HEARING held the day of , 20 READ a third time the day of , 20 ADOPTED, the day of , 20 _____________________________ ____________________________ PRESIDING MEMBER CORPORATE OFFICER APPENDIX C PURDEY AVE.228 ST.PURDEY AVE.228 ST.12094 /9212128 12120 12040 22745/4712154 12109 12105 12141 12155 12050 12065 12147 12091 12151 12115 12135 12140 12105 12121 12125 12065/75/85/95 12131 12092 12139 12053 2289012078 12080 2288112120 22773/872288812145 12095 12130 12143 12070 12090 12037 12157 12041 12055 12110 228072283912150 228702288012112 12087 12064 12041 2288212160 12103 2287112081 2287212115 12140N 50' 5 250 240 3 339 300 E 1/2 A244 237 337 Rem. 320 331 18 238 245 340 Rem. N 130' of 2 318 A 301 N 1/2 6 242 299 319 B Rem. 5 332 316 401 228 402 251 315 260 S 1/2 6 2 Rem. W1/2 A17 1 261 326 338 317 246 1 295 336 3021 1 235 A 226 337 247 Rem. 2 B 241 B A 249 262 296 236 227 327 327 239 248 252 S 1/2 7 Rem. 297 225 338 N70' N130' of 2 2 294 243 P 44292P 44292P 11644P 44292 *PP083LMP 6030P 44858 *PP091P 17221P 46282EP 12239P 47804 *PP090 LMP 4065 P 68638 P 44858LMP 1505 P 56987 BCS 3189 P 62211 LMP 26553P 44858 P 51371P 8333P 52750 P 67081 P 77489P 11845P 77596P 52578P 52578R W 8 0 2 4 3 EP 44294228 ST.GREENWELL ST.SCALE 1:1,500 MAPLE RIDGE ZONE AMENDINGBylaw No. Map No. From: To: RS-1 (One Family Urban Residential) R-3 (Special Amenity Residential District) 7237-20161671 APPENDIX D - 1 - City of Maple Ridge TO: Her Worship Mayor Nicole Read MEETING DATE: May 2, 2016 and Members of Council FILE NO: 2015-275-RZ FROM: Chief Administrative Officer MEETING: C of W SUBJECT: Second Reading Official Community Plan Amending Bylaw No. 7176-2015 23227 Dogwood Avenue EXECUTIVE SUMMARY: A Temporary Use Permit application has been received for the subject property, located at 23227 Dogwood Avenue, to permit a temporary parking lot to serve the existing Black Sheep Pub, located to the south of the subject property. Council granted first reading and considered the early consultation requirements for the Official Community Plan (OCP) Amending Bylaw No. 7176-2015, on October 27, 2015. A text amendment to Appendix D - Temporary Use Permits of the Official Community Plan (OCP) is proposed to allow a temporary parking lot on the subject property. RECOMMENDATIONS: 1)That, in accordance with Section 475 of the Local Government Act, opportunity for early and on-going consultation has been provided by way of posting Official Community Plan Amending Bylaw No. 7176-2015, as amended in the Council report dated May 2, 2016, on the municipal website and requiring that the applicant host a Development Information Meeting (DIM), and Council considers it unnecessary to provide any further consultation opportunities, except by way of holding a Public Hearing on the bylaw; 2)That Official Community Plan Amending Bylaw No. 7176-2015, as amended in the Council report dated May 2, 2016, be considered in conjunction with the Capital Expenditure Plan and Waste Management Plan; 3)That it be confirmed that Official Community Plan Amending Bylaw No. 7176-2015, as amended in the Council report dated May 2, 2016, is consistent with the Capital Expenditure Plan and Waste Management Plan; 4)That Official Community Plan Amending Bylaw No. 7176-2015, as amended in the Council report dated May 2, 2016, be given second reading and be forwarded to Public Hearing; 5)That the following terms and condition be met prior to final reading: i)Amendment to Official Community Plan Appendix D – Temporary Use Permits, to add the subject property to the list of properties; and ii)A refundable security equivalent to 100% of the estimated landscape cost will be provided to ensure satisfactory provision of landscaping and retaining wall with acoustical barrier, in accordance with the terms and conditions of the Temporary Use Permit. 1102 - 2 - DISCUSSION: 1)Background Context: Applicant: David Ho Owner: Beta Enterprises Ltd. Legal Description: Lot 1, Section 28, Township 12, New Westminster District Plan LMP46534, Except: Plan BCP39158 OCP: Existing: Commercial Proposed: Commercial, Temporary Off-Street Parking Use Zoning: Existing: C-1 (Neighbourhood Commercial) Proposed: C-1 (Neighbourhood Commercial) Surrounding Uses: North: Use: Residential Zone: RS-2 (One Family Suburban Residential) Designation: Estate Suburban Residential South: Use: Pub and Liquor Store Zone: CS-1 (Service Commercial) Designation: Commercial and Estate Suburban Residential East: Use: Residential Zone: RS-2 (One Family Suburban Residential) Designation: Estate Suburban Residential West: Use: Residential (Strata) Zone: RG-2 (Residential Strata) and RS-2 (One Family Suburban Residential) Designation: Estate Suburban Residential Existing Use of Property: Vacant Proposed Use of Property: Temporary Off-Street Parking Use Access: Dogwood Avenue Site Area: 1758 m² (0.43 acres) Servicing: Urban 2)Site Characteristics: The subject property is approximately 1758 m² (0.4 acres), and is located on the north-east corner of 232 Street and Dogwood Avenue. It is bordered to the north, east, southeast and southwest by single family residential developments and the Black Sheep Pub is located to the south (see Appendices A and B). 3)Project Description: The subject property had an approved development permit (2012-062-DP) issued on July 11, 2014, which proposed a mixed-use commercial and residential development that would consist of five commercial units on the main level, and five rental housing units on the second storey. A text - 3 - amendment to the C-1 (Neighbourhood Commercial) zone was required to allow for the increased density. However, as substantial construction did not commence within 18 months of approval, this development permit has expired. The applicant is now proposing to amend Appendix D - Temporary Use Permits of the Official Community Plan (OCP) to allow a Temporary Use Permit for off-street parking on the subject property (see Appendix C). This will provide approximately 58 parking spaces for the Black Sheep Pub , located at 12968 232 Street, for up to six years, or until such a time that the owner decides to redevelop the subject property. Perimeter landscaping and the acoustical barrier walls proposed under the previously approved development permit (2012-062-DP) will be provided as a condition of this Temporary Use Permit (see Appendices D and E). As per Section 497 of the Local Government Act, the Temporary Use Permit is valid for a period of three years, and can be renewed only once for another period of three years. 4) Planning Analysis: Official Community Plan: An OCP amendment is required to add the subject property into Appendix D – Temporary Use Permits of the OCP. Appendix D of the OCP states the following: 1. Lands in the District may be designated to permit temporary uses if a condition or circumstance exists that warrants the use for a short period of time but does not warrant a change of land use designation or zoning of the property. 2. Council has the authority by resolution to issue Temporary Use Permits to allow temporary uses on specific properties. Council may specify conditions for the temporary use. 3. Designated Temporary Use Permit areas will require guidelines that specify the general conditions regarding the issuance of permits, the use of the land, and the date the use is to terminate. 4. As a condition of issuing the permit, Council may require applicants or owners to remove buildings, to restore the property to a specific condition when the use ends, and to post a security bond. A permit may be issued for a period of up to three years, and may be renewed only once. 5. Council may issue Temporary Use Permits to allow: a) temporary commercial uses, i.e., temporary parking areas; and b) temporary industrial uses, i.e. soil screening. 6. A Temporary Use Permit is issued in accordance with the provisions of Section 920.2 of the Local Government Act. The main difference between rezoning and temporary use permits is the duration of time that the use is permitted on the property, and the removal and restoration requirements. Under the previous Rezoning and Development Permit applications, a text amendment was approved to allow off-street parking for 18 parking spaces for the Black Sheep Pub as a principal use on the subject property; however these parking spaces were going to be provided in an underground parkade once the development was constructed. This Temporary Use Permit would temporarily allow the off-street surface parking as a principal use over the entire property, without a principal building on the property. - 4 - In addition to the Temporary Use Permit for the subject property, amendments to Appendix D of the OCP are also proposed to add “other temporary uses” under the section that allows Council to issue Temporary Use Permits, as currently Council may only issue Temporary Use Permits for commercial or industrial uses, which reflected the Local Government Act language of the day. Other amendments are of a housekeeping nature and change the Local Government Act reference and reflect that Maple Ridge is now a City rather than a District. The bylaw has been amended to add the Permit Area Number “5”, to be in sequential numeric order within Appendix D of the OCP. 5)Development Information Meeting: A Development Information Meeting was held at 23347 128 Avenue, Yennadon Elementary School, on March 17, 2016. Six neighbours attended the meeting and supported the temporary parking lot to help relieve parking congestion along Dogwood Avenue. One letter of support was received from the public. 6)Interdepartmental Implications: The Engineering Department has indicated that a Building Permit will be required for the onsite works which will include a storm sewer connection. Securities for offsite works have already been collected with the previous rezoning application. 7)Traffic Impact: The temporary parking lot is intended to alleviate the parking concerns along Dogwood Avenue. The temporary parking lot could be in use for a potential maximum of up to six years, should the applicant receive an extension through Council after the first three years for the Temporary Use Permit. When the subject property redevelops, a covenant is in place to provide 18 parking spaces for the Black Sheep Pub, located at 12968 232 Street. 8)School District No. 42 Comments: Pursuant to Section 476 of the Local Government Act, consultation with School District No. 42 is required at the time of preparing or amending the OCP. A referral was sent to School District No. 42 on November 13, 2015 and no response has been received to date. 9)Local Government Act: An amendment to the OCP requires the local government to consult with any affected parties and to adopt related bylaws in compliance with the procedures outlined in Section 477 of the Local Government Act. The amendment required for this application, to amend Appendix D - Temporary Use Permits of the Official Community Plan (OCP) is proposed to allow a Temporary Use Permit on the subject property, is considered to be minor in nature. It has been determined that no additional consultation beyond existing procedures is required, including referrals to the Board of the Regional District, the Council of an adjacent municipality, First Nations, the School District or agencies of the Federal and Provincial Governments. - 5 - The amendment has been reviewed with the Financial Plan/Capital Plan and the Waste Management Plan of the Greater Vancouver Regional District and determined to have no impact. CONCLUSION: It is recommended that second reading be given to OCP Amending Bylaw No. 7176-2015, and that application 2015-275-CU be forwarded to Public Hearing. “Original signed by Michelle Baski” _______________________________________________ Prepared by: Michelle Baski, AScT, MA Planner 1 “Original signed by Christine Carter” _______________________________________________ Approved by: Christine Carter, M.PL, MCIP, RPP Director of Planning “Original signed by Christine Carter” for _______________________________________________ Approved by: Frank Quinn, MBA, P.Eng GM: Public Works & Development Services “Original signed by E.C. Swabey” _______________________________________________ Concurrence: E.C. Swabey Chief Administrative Officer The following appendices are attached hereto: Appendix A – Subject Map Appendix B – Ortho Map Appendix C – OCP Amending Bylaw No. 7176-2015 Appendix D – Site Plan Appendix E – Proposed Retaining Wall with Acoustical Barrier DATE: Sep 3, 2015 FILE: 2015-275-CU BY: PC PLANNING DEPARTMENT SUBJECT PROPERTY ´ Scale: 1:2,000 23227 DOGWOOD AVENUE DOGWOOD AVE 232 STLegend !(Ponds \\Wetlands GPS Creek Centrelines Streams & Rivers (Topographic) Feature Type Indefinite Creek Centreline Ditch Centreline River Centreline Rivers & Lakes (Topographic) Feature Type Lake/Reservoir River Major Rivers & Lakes APPENDIX A City of PittMeadows District of Langley District of MissionFRASER R. ^ DATE: Sep 3, 2015 FILE: 2015-275-CU BY: PC PLANNING DEPARTMENT SUBJECT PROPERTY City of Maple Ridge´ Scale: 1:2,000 23227 DOGWOOD AVENUE (2011 IMAGERY) DOGWOOD AVE 232 STAPPENDIX B CITY OF MAPLE RIDGE BYLAW NO. 7176-2015 A Bylaw to amend the Official Community Plan Bylaw No. 7060-2014 _______________________________________________________________________________ WHEREAS Section 882 of the Local Government Act provides that the Council may revise the Official Community Plan; AND WHEREAS it is deemed expedient to amend Schedule "A" to the Official Community Plan; NOW THEREFORE , the Municipal Council of the City of Maple Ridge, enacts as follows: 1.This Bylaw may be cited for all purposes as "Maple Ridge Official Community Plan Amending Bylaw No. 7176-2015." 2.Appendix D. TEMPORARY USE PERMITS, Section TEMPORARY USE PERMITS is amended as follows: i.Subsection 1. is amended by replacing the word “District” with the word “City” ii.Subsection 5. is amended by adding item c) in correct numerical order: c)other temporary uses iii.Subsection 6. is amended by replacing “Section 920.2” with “Section 492” iv. Subsection 7. Is deleted in its entirety and replaced with the following: 7. The following section lists areas designated for Temporary Uses and describes the purpose of the use. The described purpose and the specified general conditions for issuing a Permit for the declared areas are described as part of the Temporary Use Permit. 3.Appendix D. TEMPORARY USE PERMITS, Section TEMPORARY USE PERMIT AREA is amended by the addition of the following, in sequential numeric order: “Temporary Commercial Use Permit Area Location No.5 Purpose: To permit temporary off-street parking use with 58 parking spaces for the Black Sheep Pub, located at 12968 232 Street. Location: Those parcels or tracts of land shown on Temporary Commercial Use Permit Area No. 5 map, and known and described as: Lot 1 Section 28 Township 12 New Westminster District Plan LMP46534 EXCEPT: Plan BCP39158” APPENDIX C is hereby designated to permit a temporary commercial use for off-street parking, for a three-year period, effective upon adoption of this bylaw. 4. Appendix D. TEMPORARY USE PERMITS, Section TEMPORARY USE PERMIT AREA is amended by the addition of the attached Temporary Commercial Use Permit Area Location No. 5 map, in sequential numeric order. 5. Maple Ridge Official Community Plan Bylaw No. 7060-2014, as amended, is hereby amended accordingly. READ A FIRST TIME the 27th day of October, 2015. READ A SECOND TIME the day of , 20 . PUBLIC HEARING HELD the day of , 20 . READ A THIRD TIME the day of , 20 . ADOPTED the day of , 20 . ___________________________________ _____________________________ PRESIDING MEMBER CORPORATE OFFICER DATE: Apr 7, 2016 BY: DT 12892 1296823227 2324223298 23299233032322312854 23199/2331123100 233532315112885 2324123240232642328712888 2317712899 12912 23327231 0 0 23228232452325723236232622321423265232712328023302129 AVE.232 ST.231 ST.232 ST.130 AVE.SL 1 A P 14790 W 1/2 4*LMP6904NWS 2746 SK 12238 P 20593 E *PP131P 6337 F P 58062 21 22 5 L SL 17 33 P 25708 LMP 46534 2 P 26004 1 C P 75590 Rem A G P 20593 I P 15594 K O 2 M 1 SL 2 CP 1 P 15594 P 14790 J N P 10938 P 6488P 77424 2 6 Rem. C 3 P 10938 P 77424 BCP 38954 D P A 3 P 15594 P 15594 232 ST.DOGWOOD AVE. Scale: 1:2,000 TEMPORARY COMMERCIAL USE PERMIT AREA Location No. 5 CITY OF MAPLE RIDGE PLANNING DEPARTMENT P.L 57.92m ( 190.03 ft.)P.L 30.50m ( 100.07 ft.)TOTAL 58 STALLS AT GRADETOP OF 6 FT. HIGHPRECAST CONCRETE FENCEAND WOOD FENCEON CONC. RETAINING WALLELEV. @ 19.78mTOP OF 6 FT. HIGH WOOD FENCE@ 19.79m58'-0" [17.68 M]42'-1" [12.83 M]TIER 2 TIER 1 EA1.2DA1.2DA1.2190'-0" [57.91 M]ALUMN. GUARDRAILRETAINING WALL NEW LET DOWNTIER 2TIER 1T.O FIN. GRADE 17.65MSTREET TREES ASPER LANDSCAPEDRAWINGS232 STREET DOGWOOD AVE.EXIST. BRICKCOLUMNSEXIST. DRIVEWAYASPHALTPAVING246844525048545658403836461012`1416182022242628303234425'-0" [1.52 M]100'-1" [30.50 M] 5'-0" [1.53 M]TOP OF 5 FT. HIGHPRECAST CONC.FENCEON CONC. RETAIN. WALLELEV. @ 19.47m42" HIGH MIN.ALUMN. GUARDRAILANCHORED ON TOP OFCONC. RETAIN. WALLELEV. @ 18.15m152'-2" [46.38 M]APPENDIX D INTERIOR SIDE P.LEXISTING FINISHED GRADEBEYONDEXISTING GRADE ONADJOINING EAST PROPERTYEXTERIOR P.L6'-0" HIGH PRECAST CONCRETEFENCED-D-TIER 2 LEVEL CONCRETE RETAINING WALLFINISHED GRADE BEYOND@ 17.65T.O TIER 2 RETAIN. WALL 17.09T.O TIER 1 RETAIN. WALL 17.95T.O FENCE 19.785'-0" HIGH PRECAST CONCRETEFENCE ON RETAINING WALLMAX. RETAIN. WALLHT. PERMITTED42'-1" [12.83 M]100'-1" [30.51 M]58'-0" [17.68 M]T.O FENCE 19.47M42" HIGH MIN. ALUMN.GUARDRAIL ANCHOREDON TOP OF CONC. RETAININGWALL WITH POSTS AT 48" O.CMAX.FINISHED GRADE BEHINDRETAIN. WALLEXISTING GRADEBEYONDEXISTING GRADE ONADJOINING NORTH PROPERTYCONCRETE RETAINING WALLAS PER STRUCT.INTERIOR P.LEXTERIOR P.LE-E-NEW WOOD FENCE BEYOND TO BE 6'-0" HIGHC/W WOOD POSTS SPACED 6'-0" O.CT.O TIER 2 RETAIN. WALL 17.09T.O TIER 1 RETAIN. WALL 17.95T.O FENCE 19.78RECESSED PATTERN INCONC. RETAINING WALL190'-0" [57.91 M]4'-0" [1.22 M]186'-0" [56.69 M]42" HIGH MIN. ALUMN.GUARDRAIL ANCHOREDON TOP OF CONC. RETAININGWALL WITH POSTS AT 48" O.C MAX.152'-2" [46.38 M]FIN. GRADE @ 17.51EXISTING GRADEINTERIOR P.LLAND. STRIPCONC. RETAIN. WALL ANDFOOTING AS PER STRUCT.CONC. PLANTERFINISHED GRADE @ 17.51EXISTING GRADEINTERIOR P.LMIN. LAND.CONC. RETAIN. WALL ANDFOOTING AS PER STRUCT.DRAIN TILE AS PER OTHERCONC. RETAINING WALLAPPENDIX E City of Maple Ridge TO: Her Worship Mayor Nicole Read MEETING DATE: May 2, 2016 and Members of Council FILE NO: 2015-361-RZ FROM: Chief Administrative Officer MEETING: C0W SUBJECT: Second Reading Maple Ridge Zone Amending Bylaw No. 7190-2015 Zoning Bylaw Text Amendment for a “1 km rule” fo r Wine Stores in Grocery Stores EXECUTIVE SUMMARY: At a Council Meeting held on November 24, 2015, Council directed staff to bring forward a bylaw to establish a 1 kilometre distance rule (the 1-km Rule) through a Zoning Bylaw amendment for all future alcohol beverage retailers in Maple Ridge. This would prohibit wine and liquor sales from establishing in grocery stores within one kilometer of existing private or government liquor stores. Council passed the following resolution: That the City hereby begin the preparation of a zoning bylaw in the form of a bylaw attached as Appendix “H” of the staff report dated August 31, 2015 to prohibit the sale of liquor in any grocery store located within one kilometer of a license retail store or government liquor store. When the staff report was considered on December 8, 2015, Council passed the following resolution: That Bylaw No. 7190-2015 be given first reading and that staff be directed to provide Council with information as to the decision of the City of Pitt Meadows and the City of Mission on the sale of wine in grocery stores. RECOMMENDATION: That Maple Ridge Zone Amending Bylaw No. 7190-2015 be given second reading, and forward ed to Public Hearing. BACKGROUND Council received a letter dated June 18, 2015 from the Alliance of Beverage Licensees (ABLE BC) (see Appendix A) regarding Bill 22, the new Special Wine Store Licence Auction Act. The Alliance expressed concern about the impact of wine sales in grocery stores on private liquor stores (referred to as “licensee retail stores” under the Liquor Control and Licensing Act and the Liquor Control and Licensing Regulation). 1103 At a Council Meeting held on July 28, 2015, Council directed staff to prepare a report on options for implementing a minimum 1 kilometre distance rule (the 1-km Rule) through a Zoning Bylaw amendment for all future alcohol beverage retailers in Maple Ridge . Council passed the following resolution: That staff be directed to prepare a report on options for the implementation of a minimum one km distance rule for all future beverage alcohol retailers in Maple Ridge. The requested report was presented at Workshop on August 31, 2015, at which time; Council was presented with three options to proceed with in response to the ABLE BC. These options were: 1.Make no changes and maintain the “status quo” with the Liquor Cont rol Licencing Branch regulating the licensing of liquor sales in grocery stores through their regulations and directives; or 2.Amend the Zoning Bylaw to prohibit liquor sales in all grocery stores, such that a site specific Zoning Bylaw amendment would be required for any grocery store wishing to sell wine or other liquor; or 3.Amend the Zoning Bylaw to prohibit the sale of liquor in grocery stores that are located within 1 kilometre of an existing liquor store Council selected Option 2, granted first and second readings to Maple Ridge Zone Amending Bylaw No. 7162-2015 on August 31, 2015, held Public Hearings on September 15 and October 20, 2015, and defeated the bylaw when third reading was considered on October 27, 2015. In the interim period between Council’s decision to defeat the amending bylaw (No.7162 - 2015) and the decision to again reconsider the matter (Nov 24th, 2015), an application was received for a business licence from a grocery store for wine sales. Given that there was no restriction in place and Council had dealt with the issue fully, the business licence was issued and wine may be purchased at the Valley Fair Mall Save-on Foods. Any new amendment by Council to the Zoning Bylaw intending to restrict wine sales in grocery stores cannot be applied retroactively to this store (i.e. it is now in operation and therefore “grandfathered”). On November 24, 2015, Council directed staff to bring forward a bylaw in line with Option 3 to establish a 1 kilometre distance rule (the 1-km Rule) through a Zoning Bylaw amendment. The requested bylaw Maple Ridge Zone Amending Bylaw No. 7190-2015 (Appendix C) was considered by Council on December 8, 2015. Council granted first reading only, and requested more information on decisions in the neighbouring communities of Pitt Meadows and Mission, before making a decision about whether or not to proceed further. The following motion was passed by Council: That Bylaw No. 7190-2015 be given first reading and that staff be directed to provide Council with information as to the decision of the City of Pitt Meadows and the City of Mission on the sale of wine in grocery stores. DISCUSSION Decision by Pitt Meadows: On December 15, 2015, Pitt Meadows Council referred the issue of establishing a one kilometre distance requirement for liquour/wine sales in grocery stores to their staff. On January 25, 2016, Pitt Meadows Council decided to proceed with a text amending bylaw (Appendix B) to establish such a distance restriction, granting first and second reading on March 1, 2016. The bylaw went before Public Hearing and was granted third and final reading on April 5, 2016. Decision by Mission: As of mid-April, Administrative staff in Mission have advised us that Mission Council does not intend to regulate wine sales in grocery stores. CONCLUSION On November 24, 2015, Council requested that a 1 kilometre distance rule (the 1-km Rule) be established through a Zoning Bylaw amendment for all future alcohol beverage retailers in Maple Ridge. Such a report was brought forward and Bylaw No. 7190-2015 was given first reading, pending more information from staff about decisions by the councils in Pitt Meadows and Mission on the same grocery store wine sale issue. A 1 Kilometre Rule similar to the one being considered by Maple Ridge Council was passed by Pitt Meadows Council. Mission Council will not be pursuing grocery store wine sale restrictions at this time. “Original signed by Adrian Kopystynski” ______________________________________________ Prepared by : Adrian Kopystynski, MCIP, RPP, MCAHP Planner “Original signed by Christine Carter” _________________________________________________ Approved by : Christine Carter, M.PL, MCIP, RPP Director of Planning “Original signed by Christine Carter” for __________________________________________________ Approved by: Frank Quinn, MBA, P. Eng. GM: Public Works & Development Services “Original signed by E.C. Swabey” _________________________________________________ Approved by : E. C. Swabey Chief Administrative Officer Appendix A – Letter from Alliance of Beverage Licensees (ABLE BC) Appendix B – Pitt Meadows Zone Amendment Bylaw No. 2731, 2016 Appendix C - Maple Ridge Zone Amending Bylaw No. 7190-2015 APPENDIX A CITY OF PITT MEADOWS ZONING BYLAW AMENDMENT BYLAW NO. 2731, 2016. #134572v1 A Bylaw to amend a section of Zoning Bylaw No. 2505, 2011 WHEREAS, it is deemed expedient to amend the City of Pitt Meadows Zoning Bylaw No. 2505, 2011, as amended; AND NOW THEREFORE, the Council of the City of Pitt Meadows in open meeting assembled, ENACTS AS FOLLOWS: 1.This Bylaw may be cited as the "City of Pitt Meadows Zoning Bylaw Amendment Bylaw No. 2731, 2016". 2.Part 5 Specific Use Regulations is amended by inserting the following: Section 5.16 Liquor and Wine Sales in Grocery Stores Liquor or wine sales in grocery stores are not permitted unless the grocery store is located no less than 1 km from any existing liquor or wine store (as measured in a straight line from the primary retail entrance to the primary retail entrance). 3.City of Pitt Meadows Zoning Bylaw No. 2505, 2011 as amended, is hereby amended accordingly. READ a FIRST and SECOND time the 1st day of March, 2016. PUBLIC HEARING held the ___ day of __________, 2016. READ a THIRD time the ___ day of __________, 2016. FINALLY CONSIDERED AND ADOPTED the ___ day of __________, 2016. Mayor Corporate Officer - 175 - APPENDIX B CITY OF MAPLE RIDGE BYLAW NO. 7190-2015 A Bylaw to prohibit liquor sales in grocery stores within one kilometre of a liquor store __________________________________________________________________________ WHEREAS it is deemed expedient to amend Maple Ridge Bylaw No. 3510-1985; NOW THEREFORE, the Municipal Council of the City of Maple Ridge enacts as follows: Citation 1.This Bylaw may be cited as “Maple Ridge Zone Amending Bylaw No. 7190-2015.” Amendments 1.Maple Ridge Zoning Bylaw No. 3510-1985 is amended by adding the following under Part 4, GENERAL REGULATIONS, Section 401(3): (g) The sale in or from an ineligible grocery store, or in or from a store located in an ineligible grocery store, of beer, cider, wine or spirits, or any other product intended for human consumption, that contains more than 1% alcohol by volume, except a product produced primarily for cooking purposes, and for this purpose “ineligible grocery store” means a grocery store any part of any public entrance to which is located within 1 kilometre, measured in a straight line, from any part of any public entrance to a Licensee Retail Store or government liquor store that is carrying on business when sales referred to in this section commence. READ a first time the 8th day of December, 2015. READ a second time the day of 2016. PUBLIC HEARING held the day of 2016. READ a third time the day of 2016. ADOPTED the day of 2016. _______________________________ ________________________ PRESIDING MEMBER CORPORATE OFFICER APPENDIX C City of Maple Ridge TO: Her Worship Mayor Nicole Read MEETING DATE: May 2, 2016 and Members of Council FILE NO: 2014-054-SD FROM: Chief Administrative Officer MEETING: C of W SUBJECT: First, Second, and Third Reading Dogwood Local Area Service Bylaw No. 7246-2016 23590 Dogwood Avenue EXECUTIVE SUMMARY: The developer of the property located at 23590 Dogwood Avenue has made a formal petition (Appendix “E”), per the Community Charter, Part 7, Division 5, 211 (1)(a), requesting the City provide a Local Area Service Bylaw specific to those properties to be created by subdivision. The service is for enhanced landscape maintenance of a parkette and trail within the development. The bylaw will require the future property owners of each of the 12 single family lots to pay an annual fee as a Local Service Tax for these enhanced landscape maintenance areas within the development. Similar Local Area Service bylaws have been established in Albion and Silver Valley. A concurrent rezoning application (2014-054-RZ) was granted final reading on March 8, 2016. Local Area Service Bylaws have previously been applied in other areas of Maple Ridge, predominantly in growth areas such as Silver Valley and Albion. The nature of this development project as a relatively small infill project has generated discussion about the application parameters for when Local Area Service Bylaws are required. As such, staff will be preparing an information report to Council in 2016 outlining the current practices and performance of Local Area Service Bylaws. RECOMMENDATIONS: 1.That a Local Area Service Bylaw, as formally petitioned by the developer of the lands referred to as ‘Dogwood’, and per the Community Charter, Part 7, Division 5, 211 (1)(a), be authorized for the enhanced landscape maintenance costs to be levied on the benefitting properties to be created by subdivision of the land; and further 2.That Dogwood Ridge Local Area Service Bylaw No. 7246-2016 be given first, second and third readings. DISCUSSION: a)Background Context: The subject property was rezoned on March 8, 2016 to allow for future subdivision into 12 single family lots. The lots will be accessed from a new local road connected to Dogwood Avenue. The new local road has been designed to maintain a large isolated stand of mature trees through the creation of a 1,158 m2 (12, 464 ft2) ‘parkette’ within the road allowance. Similar road designs have been used in Silver Valley Eco-Cluster developments, and in Albion. The proposed road will loop around this stand of trees so that they can be preserved in their natural state. 1104 - 2 - In addition, the applicant proposes to dedicate 6,601.1 m2 (71,054 ft2) of developable land along the eastern property line for preservation of mature trees. These combined areas are equivalent to 25% of the development site area, which does not include Environmentally Sensitive Areas (ESA) that are undevelopable. A pedestrian trail will be constructed through the dedicated park land to the river and will connect to the vehicle access road. As this area has not been identified as part of the trail network, ongoing maintenance for the trail, as well as the ‘parkette’, will be funded through a Local Area Service Bylaw for the benefitting 12 lots created through subdivision. b)Desired Outcomes: A Local Area Service Bylaw is required for the enhanced landscape maintenance of a parkette and trail within the development in order for subdivision approval under application 2014-054-SD. The developer has made a formal petition, per the Community Charter, Part 7, Division 5, 211 (1)(a), requesting the City provide a Local Area Service Bylaw, specific to those properties to be created by subdivision. The developer of the site will be responsible for the enhanced landscaped areas installation costs and maintenance costs, ensuring 100% survival, for the first year after completion of planting. The costs for ongoing maintenance in subsequent years will then be provided by the 12 property owners after subdivision. The cost recovery method will be through the collection of 100% of the enhanced landscaping maintenance costs as a Local Service Tax. c)Dogwood Enhanced Landscape Area Requirements: The enhanced landscape maintenance areas include a parkette and trail. These areas are identified on the Bylaw Map (Schedule “A” of Appendix “D”). The planting concept for these landscape areas is for enhanced natural areas that will preserve the existing trees and will include a variety of native shrubs. The planting plan for the enhanced landscape planting areas was prepared by Letts Environmental Consultants and is attached as Schedule ‘C” of Appendix “D”. The recommended procedures and frequencies for maintenance is Level 3 – Moderate, under the BC Landscape Standard. This standard is for preservation of natural conditions, with weeds and debris removed as necessary. The standard includes maintaining areas to preserve natural plantings in a natural condition. Phoenix Environmental has provided an estimate for the yearly maintenance of $1,350.00 per year after the developer’s initial one year maintenance period, attached as Appendix “E”. d) Citizen Implications: The estimated cost of the petitioned service will be $112.50 per year for each residential lot of the 12 lots in the Dogwood Local Area Service. It is anticipated that this charge will start in 2018, after the completion of the one year maintenance period required from the developer. Potential buyers prior to 2018 will be advised of the future charge through a notation on the Property Tax Information Sheet. Once the charge comes into effect, the cost will be included in the property tax. Operations Department: The enhanced landscaping maintenance requirements for the enhanced landscape planting areas in this development are in excess of the funded base level of maintenance provided throughout Maple - 3 - Ridge, and therefore would be unfunded by the City. Local Area Service bylaws have been established in several other areas in the City, including Albion and Silver Valley. Finance Department: The Property Tax section of the Finance Department will impose the cost of this service as a levy and place the notation on the tax roll of the benefitting property owners, anticipated to be in 2018. CONCLUSION: It is recommended that the formal petition by the developer for a Local Area Service be authorized by Council for the enhanced landscape maintenance costs to be levied on the benefitting properties to be created by subdivision of the land; and that first, second and third readings be given to Dogwood Local Area Service Bylaw No. 7246-2016. “Original signed by Amelia Bowden” _______________________________________________ Prepared by: Amelia Bowden Planning Technician “Original signed by Christine Carter” “Original signed by David Boag” ____________________________________________ _______________________________________ Approved by: Christine Carter, M.PL, MCIP, RPP Approved by: David Boag Director of Planning Director of Parks & Facilities “Original signed by Christine Carter” for _______________________________________________ Approved by: Frank Quinn, MBA, P. Eng GM: Public Works & Development Services “Original signed by E.C. Swabey” _______________________________________________ Concurrence: E.C. Swabey Chief Administrative Officer The following appendices are attached hereto: Appendix A – Subject Map Appendix B – Ortho Photo Appendix C – Subdivision Plan Appendix D –Local Area Service Bylaw No. 7246-2016 Appendix E – Cost Estimate for Yearly Maintenance Appendix F – Petition for Local Area Service City of PittMeadows District ofLangley District of MissionFRASER R. ^ DATE: Jun 16, 2014 FILE: 2014-054-RZ BY: PC CORPORATION OF THE DISTRICT OF MAPLE RIDGE PLANNING DEPARTMENT SUBJECT PROPERTIES ´ Scale: 1:2,500 23598 & 23627 DOGWOOD AVENUE 128 AVE FERN CR APPENDIX A City of PittMeadows District ofLangley District of MissionFRASER R. ^ DATE: Jun 16, 2014 FILE: 2014-054-RZ BY: PC CORPORATION OF THE DISTRICT OF MAPLE RIDGE PLANNING DEPARTMENT SUBJECT PROPERTIES District of Maple Ridge´ Scale: 1:2,500 23598 & 23627 DOGWOOD AVENUE 128 AVE FERN CR SKRWRJUDSK\LPDJH APPENDIX B APPENDIX C CITY OF MAPLE RIDGE LOCAL AREA SERVICE BYLAW NO. 7246-2016 A Bylaw to authorize a municipal service to maintain enhanced landscape areas; to define the benefitting lands; and to establish that the cost of the municipal service shall be borne by the owners of real property within such defined area. WHEREAS, Council has been petitioned to provide a municipal service pursuant to Division 5, Section 210 of the Community Charter S.B.C. 2003, c.26 (the “Community Charter”); AND WHEREAS the Corporate Officer has certified that the petition received for the municipal services does constitute a sufficient and valid petition; AND WHEREAS it is deemed expedient to proceed with the works; AND WHEREAS the “Maple Ridge Local Area Service Policy”, as amended, provides that the cost of providing a municipal service shall be recoverable from each of the existing parcels of land and all future lots created by subdivision of the parcels, specifically: Lot A Section 28 Township 12 New Westminster District Plan EPP56756 Except Plan EPP56757 that will benefit from the service. NOW THEREFORE, the Municipal Council of the City of Maple Ridge enacts as follows: 1.This Bylaw may be cited as “Dogwood Local Area Service Bylaw No. 7246-2016”. 2.The contents of Schedules “A”, “B” and “C” attached hereto are hereby declared to be made an integral part of this Bylaw. 3.The Local Area Service of the City for the benefit of which the enhanced landscape areas are to be maintained as a municipal service are defined as the hatched areas on the attached Schedule “A”. 4.The recommended procedures and frequencies for maintenance and Annual Charges are described on the attached Schedule “B”. 5.The Enhanced Landscape Area planting and design plans “Trail & Parkette Restoration Planting Plan” by Phoenix Environmental Services Ltd dated April 2016; are attached as Schedule “C” 6.The bylaw shall take effect as of the date of adoption hereof. READ a first time the day of , 201. READ a second time the day of , 201. READ a third time the day of , 201. ADOPTED the day of , 201. _____________________________ ____________________________ PRESIDING MEMBER CORPORATE OFFICER APPENDIX D DOGWOOD AVE. 128 CRESC E N T 234 B ST.23565236812355323490235902349623641235242361223669235752348323647234612344712835 23532236471287023452 23694236792365323463/65235052368923525234972344812895 13034 12865 236623 B 1 4 PARK4 5 A 37 1 E 41 PARK A 2 A D 3 F A 1 2 4 Rem 16 Rem A 2 3 2 42 241 38 ARem 13 P 2637 P 20363 P 50674P 19475P 46567 P 77771 P 17199 RP 15169P 7806P 38973P 11075EPP 56756 EPP 56757 P 46567 P 6438 P 77771 P 63548P 6735 RP 13095P 6734 P 50674 P 1719 9 P 11117P 6438 P 6734 P 6438 LMP 29631 BCP 44989 EP 67619EP 77772 FERN CRESCENT ´ SCALE 1:2,500 MAPLE RIDGE LOCAL AREA SERVICE BYLAWBylaw No. Enhanced Landscape Areas Original Lot Boundary 7246-2016 "Schedule A" CITY OF MAPLE RIDGE LOCAL AREA SERVICE BYLAW NO. 7246-2016 SCHEDULE “B” Class of Work: The establishment, maintenance and replacement of enhanced road parkette and trail indicated by bold outline on Schedule “A” are to be maintained as per the recommended procedures and frequencies for maintenance “Level 3 – Moderate” of the BC Landscape Standard. (BC Society of Landscape Architects and BC Landscape & Nursery Association). Annual Charge: The Annual Charge is based on a per lot basis for each of the 12 lots created by the subdivision of: Lot A Section 28 Township 12 New Westminster District Plan EPP56756 Except Plan EPP56757 Of $ 112.50 starting in 2018. The charges established under this Bylaw shall be specifically charged against the parcels benefitting from the work, payable by a per lot basis levied year by year. The Annual Charge Adjustment: The annual charge will be reviewed each year by the Operations Department, and adjusted accordingly to reflect any change in maintenance requirements or costs, and to reflect any increase in the Consumer Price Index (CPI) for Vancouver, BC for the immediately preceding year commencing with 2015, as provided by Statistics Canada. "Schedule C" APPENDIX E APPENDIX F - 1 - City of Maple Ridge TO: Her Worship Mayor Nicole Read MEETING DATE: May 2, 2016 and Members of Council FILE NO: 2011-002-RZ FROM: Chief Administrative Officer MEETING: C of W SUBJECT: Final One Year Extension Application Maple Ridge Zone Amending Bylaw No. 6795 - 2011 25608 Bosonworth Avenue EXECUTIVE SUMMARY: Council granted a one year extension to the above noted application on April 14, 2015. The applicant has now applied for a final one year extension under Maple Ridge Development Procedures Bylaw No. 5879-1999. The purpose of this application is to rezone the subject property from A-2 (Upland Agricultural) to RS-2 (One Family Suburban Residential) to allow for future subdivision into 3 lots. RECOMMENDATION: That pursuant to Maple Ridge Development Procedures Bylaw No. 5879-1999, a final one year extension be granted for rezoning application 2011-002-RZ (property located at 25608 Bosonworth Avenue and that the following conditions be addressed prior to consideration of Final Reading: i. Registration of a Rezoning Servicing Agreement as a Restrictive Covenant and receipt of the deposit of a security, as outlined in the Agreement; ii.Road widening, truncation and cul-de-sac turn-around as required; iii.Registration of a geotechnical report as a Restrictive Covenant at the Land Title Office which addresses the suitability of the site for the proposed development; iv. A disclosure statement must be submitted by a Professional Engineer advising whether there is any evidence of underground fuel storage tanks. If there is evidence, a site profile pursuant to the Waste Management Act must be provided in accordance with the regulations. v. Pursuant to the Contaminated Site Regulations of the Environmental Management Act, the property owner will provide a Site Profile for the subject land(s). 1105 - 2 - DISCUSSION: a) Background Context: Applicant: Paul Hayes Owner: Ian A Speckman Legal Description: Lot 1, Section 12, Township 12, New Westminster District Plan 2713 OCP: Existing: Suburban Residential Proposed: Suburban Residential Zoning: Existing: A-2 (Upland Agricultural) Proposed: RS-2 (One Family Suburban Residential) Surrounding Uses North: Use: Single Family Residential Zone: RS-3 (One Family Rural Residential) subject to 2012- 102-RZ for 4 RS-2 lots and 1 renmant RS-3 zoned lot Designation Suburban Residential South: Use: Vacant District Land Zone: A-2 (Upland Agricultural) Designation: Forest East: Use: Single Family Residential Zone: A-2 (Upland Agricultural) Designation: Suburban Residential West: Use: Single Family Residential Strata Zone: RG-2 (Suburban Residential Strata) Designation: Suburban Residential Existing Use of Property: Single Family Residential Proposed Use of Property: Single Family Residential Site Area: 1.882 HA. (4.56 Acres) Access: Bosonworth Avenue and 256 Street Servicing requirement: On-site septic and municipal water Companion Applications: 2015-330-SD The purpose of this application is to rezone the subject property from A-2 (Upland Agricultural) to RS-2 (One Family Suburban Residential) to allow for future subdivision into 3 lots. - 3 - The following dates outline Council’s consi deration of the application and Bylaw 6795 – 2011: - First reading was granted February 8, 2011; - Second reading was granted on March 25, 2014; - Public Hearing was held April 15, 2014; - Third reading was granted April 22, 2014; and - A first extension was granted April 14, 2015. Application Progress: The extension request for this application was submitted too late to make the April 18, 2016 CoW meeting, but before the expiry date of April 23, 2016. If Council allows the extension, it would apply retroactively, April 23, 2016 – April 23, 2017. As well, the subject site and the application across the street to the north (2012-102-RZ) have the same developer (Paul Hayes). Both applications share some conditions (e.g. those related to the road, a trail and services) making it more effective for the developer to proceed in unison . Therefore, the extension applications for both files (2012-102-RZ expires May 27, 2015) have been submitted together to allow both to proceed to completion and are both scheduled for the May 2, 2016 Committee of the Whole meeting. The applicant has made progress on some of the terms and conditions of 2011-002-RZ, including submission of a geotechnical report, a storm water management concept, topographic analysis and plans for the septic system and steep slope covenants. The steep slope covenant has replaced the requirement for a development permit application. The applicant has also made a new subdivision application in place of the one that expired. Alternatives: Council may choose one of the following alternatives: 1.grant the request for extension; 2.deny the request for extension; or 3.repeal third reading of the bylaw and refer the bylaw to Public Hearing. In considering these alternatives, pursuant to Council Policy 6.31 under the Community Amenity Contribution (CAC) Program, Council may choose to apply the CAC Program when considering extension applications. Council may choose to add to the third reading terms and conditions to require the following CAC contribution be made prior to final reading: $5,100 x 3 single family lots = $15,300 - 4 - CONCLUSION: The applicant has completed some of the terms and conditions of this rezoning application; however, needs additional time to complete the remaining ones and to coordinate this with another project across the street from the subject site. Therefore, the applicant has applied for a final one year extension. “Original signed by Adrian Kopystynski ” _______________________________________________ Prepared by : Adrian Kopystynski, MCIP, RPP, MCAHP Planner “Original signed by Christine Carter” _______________________________________________ Approved by : Christine Carter, M.PL, MCIP, RPP Director of Planning “Original signed by Christine Carter” for _______________________________________________ Approved by: Frank Quinn GM: Public Works & Development Services “Original signed by E.C. Swabey” _______________________________________________ Concurrence: E.C. Swabey Chief Administrative Officer The following appendices are attached hereto: Appendix A – Subject Map Appendix B – Ortho Map Appendix C – Second Reading Report City of PittMeadows District of Langley District of MissionFRASER R. ^ DATE: Mar 14, 2014 FILE: 2011-002-RZ BY: PC CORPORATION OF THE DISTRICT OF MAPLE RIDGE PLANNING DEPARTMENT SUBJECT PROPERTY 256 STBOSONWORTH AVE ´ Scale: 1:2,000 25608 BOSONWORTH AVENUE GODWIN DR 5= APPENDIX A City of PittMeadows District ofLangley District of MissionFRASER R. ^ DATE: Mar 14, 2014 FILE: 2011-002-RZ BY: PC CORPORATION OF THE DISTRICT OF MAPLE RIDGE PLANNING DEPARTMENT SUBJECT PROPERTY 256 STBOSONWORTH AVE District of Maple Ridge´ Scale: 1:2,000 25608 BOSONWORTH AVENUE GODWIN DR 2011 photography image APPENDIX B District of Maple Ridge TO: His Worship Mayor Ernie Daykin MEETING DATE: March 17, 2014 and Members of Council FILE NO: 2011-002-RZ FROM: Chief Administrative Officer MEETING: C of W SUBJECT: Second Reading Maple Ridge Zone Amending Bylaw No. 6795 - 2011 25608 Bosonworth Avenue EXECUTIVE SUMMARY: An application has been received to rezone the subject property from A-2 (Upland Agricultural) to RS-2 (One Family Suburban Residential), to permit a future subdivision of 3 lots. The proposed RS-2 (One Family Suburban Residential) zoning complies with the Official Community Plan. RECOMMENDATIONS: 1.That Zone Amending Bylaw No. 6795 - 2011 be given second reading and be forwarded to Public Hearing; and 2.That the following term(s) and condition(s) be met prior to Final Reading. i.Registration of a Rezoning Servicing Agreement as a Restrictive Covenant and receipt of the deposit of a security, as outlined in the Agreement; ii.Road widening, truncation and cul-de-sac turn-around as required; iii.Registration of a geotechnical report as a Restrictive Covenant at the Land Title Office which addresses the suitability of the site for the proposed development; iv. A disclosure statement must be submitted by a Professional Engineer advising whether there is any evidence of underground fuel storage tanks. If there is evidence, a site profile pursuant to the Waste Management Act must be provided in accordance with the regulations. v.Pursuant to the Contaminated Site Regulations of the Environmental Management Act, the property owner will provide a Site Profile for the subject land(s). APPENDIX C - 2 - DISCUSSION: a)Background Context: Applicant: Paul Hayes Owner: Ian A. Speckman Legal Description: Lot 1, Section 12, Township 12, New Westminstwer Plan 2713 OCP: Existing: Suburban Residential Zoning: Existing: A-2 (Upland Agricultural) Proposed: RS-2 (One Family Suburban Residential) Surrounding Uses: North: Use: Single Family Residential Zone: RS-3 (One Family Rural Residential) Designation Agricultural and Suburban Residential South: Use: Vacant District Land Zone: A-2 (Upland Agricultural) Designation: Forest East: Use: Single Family Residential Zone: A-2 (Upland Agricultural) Designation: Suburban Residential West: Use: Single Family Residential Strata Zone: RG-2 (Suburban Residential Strata) Designation: Suburban Residential Existing Use of Property: Single Family Residential Proposed Use of Property: Single Family Residential Site Area: 1.882 HA. (4.56 Acres) Access: Bosonworth Avenue and 256 Street Servicing requirement: On-site septic and municipal water Companion Applications: 2011-002-SD b)Project Description: The applicant is seeking to rezone the subject 1.882 hectare (4.56 acre) property from A-2 (Upland Agricultural) to RS-2 (One Family Suburban Residential), to create 3 single family lots. Two of the proposed lots will front on Bosonworth Avenue and the third southernmost lot will face 256 Street. Bosonworth Avenue becomes an unpaved gravel road in front of this property and 256 Street has been constructed south of Bosonworth Avenue as part of the Grant Hill subdivision to the west. Widening and paving of Bosonworth Avenue, a cul-de-sac turnaround at the current south terminus of 256 Street and a corner truncation at the intersection of these two streets will be provided as part of the subdivision associated with this rezoning application. - 3 - The subject property contains an existing dwelling to be retained. It will be sited on one of the three lots in accordance with Zoning Bylaw setback requirements. The land slopes upwards from Bosonworth Avenue and is particularly steep at the southern end of the site abutting the District Forest Lands. The southern portion of the site and the unconstructed portion of 256 Street will be retained in its natural state. A preliminary site plan showing the lot layout, proposed building envelopes and on-site septic disposal areas is attached for reference (Appendix C). c)Planning Analysis: Official Community Plan: The proposal for RS-2 (One Family Suburban Residential) Zoning is consistent with the zones permitted in the Zoning Matrix for lands designated as Suburban Residential. Consequently, the proposal is consistent with the existing Official Community Plan designation. Zoning Bylaw: The proposed lots will meet the minimum lot width, depth and area set out in the Zoning Bylaw for RS-2 (One Family Suburban Residential) zone. Each lot is at least 0.40 hectares (1.0 acre) in area, with the southern lot having a greater area of 1.055 hectares. The two lots along Bosonworth Avenue will be about 50 metres wide and 84 metres deep, and Lot 3 is about 100 metres in both width and depth. Lot 3 is larger to permit adequate space for a building site and septic fields due to the sloping conditions of the land. Development Information Meeting: A Development Information Meeting was not required because the proposed subdivision will result in fewer than 25 dwelling units, and no Official Community Plan amendment is required. d)Environmental Implications: At first reading, it was anticipated that pursuant to Section 8.10 of the Official Community Plan, a Natural Features Development Permit (NFDP) application would be required for the portion of the site with an average natural slope of greater than 15 percent. After further review, it has been determined that a development permit will not be required. Instead, the sloping lands in the southern part of the site will be subject to a no-build/no disturb steep slope covenant. Plantings will be undertaken by the applicant in lieu of a development permit, for restoration and enhancement works along an unbuilt portion of 256 Street north of Bosonworth Avenue in conjunction with another site (2012-102-RZ) being developed by the same applicant. The necessary covenant and accompanying explanatory plan will be registered on proposed Lot 3 at the time of subdivision. - 4 - e)Interdepartmental Implications: Engineering Department: Engineering has identified a number of required off site works including: construction of Bosonworth to a rural standard (it is currently a gravel road) in front of the property, a corner truncation, dedication to complete the cul-de-sac at the south end of 256 Street, storm water/drainage works on Bosonworth, and installing a mast-arm street light and new water service connections. Latecomers for the area’s water system and road access onto 256 Street may apply. Parks & Leisure Services Department: An existing off road trail within the Bosonworth Avenue right-of-way may need to be accommodated as a boulevard trail in the road right of way in conjunction with the construction of Bosonworth Avenue across the frontage of the property. This will be determined as part of the subdivision approval process. CONCLUSION: It is recommended that second reading be given to Maple Ridge Zone Amending Bylaw No. 6795 – 2011 and that application be forwarded to Public Hearing. "Original signed by Adrian Kopystynski" _______________________________________________ Prepared by: Adrian Kopystynski, MCIP, RPP, MCAHP Planner "Original signed by Christine Carter" _______________________________________________ Approved by: Christine Carter, M.PL, MCIP, RPP Director of Planning "Original signed by Frank Quinn" _______________________________________________ Approved by: Frank Quinn, MBA, P.Eng GM: Public Works & Development Services "Original signed by J.L. (Jim) Rule" _______________________________________________ Concurrence: J. L. (Jim) Rule Chief Administrative Officer The following appendices are attached hereto: Appendix A – Subject Map Appendix B – Zone Amending Bylaw Appendix C – Site Plan - 1 - City of Maple Ridge TO: Her Worship Mayor Nicole Read MEETING DATE: May 2, 2016 and Members of Council FILE NO: 2012-102-RZ FROM: Chief Administrative Officer MEETING: C of W SUBJECT: Final One Year Extension Application Maple Ridge Zone Amending Bylaw No. 6965-2013 25638 112 Avenue EXECUTIVE SUMMARY: Council granted a one year extension to the above noted application on June 23, 2015. The applicant has now applied for a final one year extension under Maple Ridge Development Procedures Bylaw No. 5879-1999. The purpose of this application is to rezone the southern portion of the subject property from RS-3 (One Family Rural Residential) to RS-2 (One Family Suburban Residential), to allow for future subdivision into 4 lots and create 1 remnant RS-3 (One Family Rural Residential) lot in the northern part of the subject property. RECOMMENDATION: That pursuant to Maple Ridge Development Procedures Bylaw No. 5879-1999, a final one year extension be granted for rezoning application 2012-102-RZ (property located at 25638 112 Avenue) and that the following conditions be addressed prior to consideration of Final Reading: i.Registration of a Rezoning Servicing Agreement as a Restrictive Covenant and receipt of the deposit of a security, as outlined in the Agreement; ii.Road dedication as required; iii.Registration of a geotechnical report as a Restrictive Covenant at the Land Title Office which addresses the suitability of the site for the proposed development; iv. Registration of a Tree Protection/Steep Slope Restrictive Covenant at the Land Title Office; v.Registration of a Agricultural Impact Assessment report and a Landscaping Plan for a buffer along the Agricultural Land Reserve Boundary at the Land Title Office; vi. Entering into a Restoration and Enhancement Agreement for the unconstructed portion of the 256 Street allowance abutting the site; vii. Removal of the existing building/s; 1106 - 2 - viii. A disclosure statement must be submitted by a Professional Engineer advising whether there is any evidence of underground fuel storage tanks. If there is evidence, a site profile pursuant to the Waste Management Act must be provided in accordance with the regulations. ix.Pursuant to the Contaminated Site Regulations of the Environmental Management Act , the property owner will provide a Site Profile for the subject land(s). DISCUSSION: a) Background Context: Applicant: Paul Hayes Owner: Walter Heckmann and Karoline Heckmann Legal Description: Lot 8, Section 13, Township 12, New Westminster District Plan 8336 OCP: Existing: Agricultural, Suburban Residential Proposed: Suburban Residential Zoning: Existing: RS-3 (One Family Rural Residential) Proposed: RS-2 (One Family Suburban Residential) and RS-3 (One Family Rural Residential) Surrounding Uses North: Use: Single Family Residential in ALR Zone: RS-3 (One Family Rural Residential) Designation: Agricultural South: Use: Single Family Residential Zone: RS-3 (One Family Rural Residential) Under application 2011-002-RZ for RS-2 (One Family Suburban Residential) Designation: Agricultural East: Use: Single Family Residential in ALR Zone: RS-3 (One Family Rural Residential) Designation: Suburban Residential West: Use: Single Family Residential Zone: RS-3 (One Family Rural Residential) Designation: Suburban Residential Existing Use of Property: Vacant, forested Proposed Use of Property: Residential Site Area: 4.047 Ha (10 acres) Access: Southern lots: Bosonworth Avenue Northern remnant lot: 112 Avenue Servicing requirement: Southern lots: Municipal water and on-site septic disposal; Northern remnant lot: Well water and on-site septic disposal - 3 - Companion Applications: 2015-229-SD This application is to permit the southern portion of the subject property to be rezoned from RS-3 (One Family Rural Residential) to RS-2 (One Family Suburban Residential) to allow subdivision into (4) lots with a minimum lot size of 0.4 ha. and one remnant RS-3 (One Family Rural Residential) lot having a minimum lot size of 0.8 ha. The following dates outline Council’s consideration of the application and Bylaw 6965-2013: First Reading was granted March 20, 2013; Second Reading was granted April 8, 2014 Public Hearing was held May 20, 2014; Third Reading was granted May 27, 2014; and First extension as granted on June 23, 2015. Application Progress: This application shares terms and conditions with application 2011-002-RZ submitted by the same developer (Paul Hayes). The rear portion of the subject site was also subject to a successful ALR exclusion application 2014-060-AL, approved by the ALC on July 27, 2015. Following this, time was spent adjusting the project (e.g. reducing the ALR buffer, changing the layout to accommodate future subdivision and grading plans). The applicant has complete some terms and conditions (e.g. topographic analysis, preliminary rehabilitation and enhancement plan, septic disposal and grading plan) and requires additional time to complete the remaining requirements. Some requirements are being pursued with 2011- 002-RZ for the road frontage the two development proposals share. Both of the extensions are scheduled for the May 2, 2016 Committee of the Whole meeting. The applicant has also submitted a new subdivision application in place of the one that expired. Alternatives: Council may choose one of the following alternatives: 1.grant the request for extension; 2.deny the request for extension; or 3.repeal third reading of the bylaw and refer the bylaw to Public Hearing. - 4 - In considering these alternatives, pursuant to Council Policy 6.31 under the Community Amenity Contribution (CAC) Program, Council may choose to apply the CAC Program when considering extension applications. Council may choose to add to the third reading terms and conditions to require the following CAC contribution be made prior to final reading: $5,100 x 5 single family lots = $25,500 CONCLUSION: With the successful exclusion of the northern portion of the property from the ALR, the applicant has been able to complete some of the terms and conditions of this rezoning application. However, additional time is needed to turn their attention to the remaining requirements and to coordinate this with another project across the street (2011-002-RZ) from the subject site. Therefore, the applicant has applied for a final one year extension. “Original signed by Adrian Kopystynski” _______________________________________________ Prepared by : Adrian Kopystynski, MCIP, RPP, MCAHP Planner “Original signed by Christine Carter” _______________________________________________ Approved by : Christine Carter, M.PL, MCIP, RPP Director of Planning “Original signed by Christine Carter” for _______________________________________________ Approved by: Frank Quinn GM: Public Works & Development Services “Original signed by E.C. Swabey” _______________________________________________ Concurrence: E.C. Swabey Chief Administrative Officer The following appendices are attached hereto: Appendix A – Subject Map Appendix B – Ortho Map Appendix C – Second Reading Report City of PittMeadows District of Langley District of MissionFRASER R. ^ DATE: Feb 25, 2013 FILE: 2012-102-RZ BY: PC 25638 112 AVENUE CORPORATION OF THE DISTRICT OF MAPLE RIDGE PLANNING DEPARTMENT SUBJECT PROPERTY ´ Scale: 1:3,000 BOSONWORTH AVE PALMER ROLPH ST5= APPENDIX A City of Pitt Meadows District of Langley District of MissionFRASER R. ^ DATE: Jun 5, 2013 2012-102-SD BY: JV 25638-112 Ave CORPORATION OF THE DISTRICT OF MAPLE RIDGE P L A N NIN G D E P A RT M E N T2553 62554 92567 62555 62559 52559 62557 52557 7 1119 8 (PUMP STATIO N)2563 82560 92559 02555 92558 02560 82566 3/97 11 360 2554 02557 22559 2 11 438 2554 12563 0 11 267 2555 42558 02573 1 11 2252552 02554 22558 8256 S T. 11 2 A V E .PA L M E R R O LP H S T.PA L M E R R O LP H S T. EPS 234 13 14 1 A EP 17454 SL49 P 17459 12 SL47 8 P 8336 SL59 11 SL58 SL57 2 P 27239 SL60 SL48 Rem 6 3 SL50 P 17459 5 P 2713 710 15 ´ Scale: 1:2,500 APPENDIX B District of Maple Ridge TO: His Worship Mayor Ernie Daykin MEETING DATE: April 7, 2014 and Members of Council FILE NO: 2012-102-RZ FROM: Chief Administrative Officer MEETING: C of W SUBJECT: Second Reading Maple Ridge Zone Amending Bylaw No.6965-2013 25638 112 Avenue EXECUTIVE SUMMARY: An application has been received to rezone the portion of the subject property located outside of the Agricultural Land Reserve (ALR) from RS-3 (One Family Rural Residential) to RS-2 (One Family Suburban Residential) to permit a future subdivision into four (4) RS-2 lots and one RS-3 lot remaining in the ALR This application received first reading for Zone Amending Bylaw No. 6965-2013 on March 12, 2013 and second reading on March 25, 2014. The site is identified by the Agricultural Land Commission as one of the “Remnant Properties” in their comments concerning the Albion Flats Concept Plan. The applicant was given the option of proceeding with an exclusion application on the rear portion of the development site ahead of rezoning. The applicant did not choose to do the exclusion; therefore, instead of rezoning from RS-3 to RS-2 (One Family Suburban Residential) and A-1 (Small Holding Agricultural), the northern portion located in the ALR will retain its current RS-3 zoning. This report is being brought forward because the bylaw granting second reading on March 25, 2014 contained an error – the map schedule correctly showed the front being rezoned from RS-3 to RS-2 and the rear retaining RS-3; however the bylaw text still referred to the A-1 Zone. This inconsistency needs to be corrected by rescinding second reading, amending the bylaw and granting second reading to the amended bylaw before being advanced to Public Hearing. The southern portion is proposed to be subdivided into 4 RS-2 lots. The proposed RS-2 (One Family Suburban Residential) zoning complies with the Official Community Plan. RECOMMENDATIONS: 1.That second reading for Zone Amending Bylaw No. 6965-2013 be rescinded; 2.That Zone Amending Bylaw No. 6965-2013 be amended as identified in the staff report dated April 7, 2014, be given second reading, and be forwarded to Public Hearing; and APPENDIX C - 2 - 3.That the following terms and conditions be met prior to Final Reading: i.Registration of a Rezoning Servicing Agreement as a Restrictive Covenant and receipt of the deposit of a security, as outlined in the Agreement; ii.Road dedication as required; iii.Registration of a geotechnical report as a Restrictive Covenant at the Land Title Office which addresses the suitability of the site for the proposed development; iv. Registration of a Tree Protection/Steep Slope Restrictive Covenant at the Land Title Office; v.Registration of a Agricultural Impact Assessment report and a Landscaping Plan for a buffer along the Agricultural Land Reserve Boundary at the Land Title Office; vi. Entering into a Restoration and Enhancement Agreement for the unconstructed portion of the 256 Street allowance abutting the site; vii. Removal of the existing building/s; viii. A disclosure statement must be submitted by a Professional Engineer advising whether there is any evidence of underground fuel storage tanks. If there is evidence, a site profile pursuant to the Waste Management Act must be provided in accordance with the regulations. ix.Pursuant to the Contaminated Site Regulations of the Environmental Management Act, the property owner will provide a Site Profile for the subject land(s). DISCUSSION: a)Background Context: Applicant: Paul Hayes Owner: Walter and Karoline Heckmann Legal Description: Lot 8, Section 13, Township 12, Plan 8336 OCP: Existing: Agricultural, Suburban Residential Zoning: Existing: RS-3 (One Family Rural Residential) Proposed: RS-2 (One Family Suburban Residential) and RS-3 (One Family Rural Residential) - 3 - Surrounding Uses: North: Use: Single Family Residential in ALR Zone: RS-3 (One Family Rural Residential) Designation: Agricultural South: Use: Single Family Residential Zone: RS-3 (One Family Rural Residential) Designation: Agricultural East: Use: Single Family Residential in ALR Zone: RS-3 (One Family Rural Residential) Designation: Suburban Residential West: Use: Single Family Residential Zone: RS-3 (One Family Rural Residential) Designation: Suburban Residential Existing Use of Property: Vacant, forested Proposed Use of Property: Residential Site Area: 4.047 Ha (10 acres) Access: Non-ALR lots: Bosonworth Avenue ALR lot: 112 Avenue Servicing requirement: Non-ALR lots: Municipal water and on-site septic disposal; ALR lot: Well water and on-site septic disposal b)Project Description: The subject property slopes down from Bosonworth Avenue northward through the ALR and to 112 Avenue. The property is currently forested, except for a clearing at the northern end. A small existing structure will be removed prior to final reading. The site is serviced with a well and septic fields. The applicant proposes to rezone the southern portion of the property that is not in the ALR from RS-3 (One Family Rural Residential) to RS-2 (One Family Suburban Residential. This will permit the creation of about 4 lots having an area of 0.45 Ha (1.1 acres) each fronting along Bosonworth Avenue. The northern 2.22 Ha (5.5 acres) portion of the property within the Agricultural Land Reserve will retain its RS-3 (One Family Rural Residential) zone. The attached preliminary site plan shows the lot layout, proposed building envelopes and on-site septic disposal areas (Appendix C). This subdivision does not require Agricultural Land Commission approval because Section 10 (1) (d) of the Agricultural Land Reserve Use, Subdivision and Procedure Regulations allows the Approving Officer to establish a legal boundary along the boundary of the Agricultural Land Reserve. - 4 - c)Planning Analysis: Official Community Plan: The southern portion of the development site is currently designated Suburban Residential and the northern portion located and being subdivided along the Agricultural Land Reserve boundary is currently designated Agricultural. The proposed rezoning complies with the established designations. Zoning Bylaw: The application proposes to rezone the southern portion of the property located at 25638 112 Avenue from RS-3 (One Family Rural Residential) to RS-2 (One Family Suburban Residential) to permit four 0.45 Ha (1.1 acre) RS-2 lots, and a remnant 2.22 Ha (5.5 acres) RS-3 parcel in the Agricultural Land Reserve. The proposed lots will comply with Zoning Bylaw requirement for lot area, width and depth. Subdivision and Development Services Bylaw: 256 Street is an unconstructed road to the west of the subject site. Due to excessive grade, the Engineering Department determined it cannot be built within municipal road standards and a development variance permit is required to dispense with its construction. Engineering is supportive of this variance. A separate report will be forwarded to Council on this matter at a future date. The road allowance contains a water pumping station at the bottom of the hill on 112 Avenue, and municipal water main from the station up the hill to Bosonworth Avenue and then further south to the Grant Hill Reservoir. Development Information Meeting: A development Information Meeting was not required because the proposed subdivision will result in fewer than 25 dwelling units. Development Permits: Pursuant to Section 8.5 of the Official Community Plan, a Natural Feature Development Permit is required to address excessive sloping conditions on portions of the site. This development permit will be coordinated with these landscaping requirements: Restoration and enhancement plantings will be undertaken by the applicant in lieu of plantings on the subject site and another to the south (2011-002-RZ). This planting will be designed not to impact the recently installed water main and to stabilize the sloping 256 Street right-of-way. - 5 - Landscaping will be planted along the rear of the proposed 4 lots and on the eastern side of the easternmost lot to create a buffer with the Agricultural Land Reserve in accordance with the Landscaping Buffer Specification established by the Agricutural Land Commission. d)Environmental Implications: The site is covered by a tree canopy that increases in intensity from north (along 112 Avenue) to south (along Bosonworth Avenue). The site is characterized by slopes between 10 and 25 percent. The southeastern portion of the site has excessive sloping (more than 25%) conditions. Therefore, the proposed eastern lot will be subject to a Tree Protection/Steep Slope Restrictive Covenant to be registered on title as a third reading condition. The Arborist Report and Tree Survey identify trees to be removed to provide envelopes for building sites and septic fields. Plans have been submitted identifying these envelopes. These envelopes will need to be adjusted for best practices as part of fulfilling subdivision conditions, particularly on the easternmost lot. A geotechnical engineer must insure that any lot grading will have no impact on slope stability. A combination of Development Permit and Restoration and Enhancement Agreement will be used to protect sensitive sloping areas and provide the specification for the necessary plantings to maintain slope stability on the site and along the 256 Street right-of-way. e)Agricultural Impact: Policy 6-12 b) strives to protect the productivity of agricultural lands by “requiring agricultural impact assessments (AIAs) and Groundwater Impact Assessment of non-farm development and infrastructure projects and identifying measures to off-set impacts on agricultural capability.” An Agricultural Impact Assessment report has been provided that satisfies District requirements for this purpose. This report confirms that there will be no direct or indirect drainage, water quality, noise and traffic impact on the agricultural area. A Landscaping Buffer Plan in accordance with ALC and District standards will be completed by the applicant. Registration of a Restrictive Covenant, with the Agricultural Impact Assessment report, a Landscaping Buffer Plan and submission of a security, is a third reading requirement. f)Interdepartmental Implications: Building Department: Comments from Building include: referencing the 2012 Building Code in the Geotechnical Report, insuring building permits are obtained to demolish existing buildings, and insuring the final site grading plan provides for smooth grade transitions between lots. - 6 - Engineering Department: Comments from Engineering have identified some off-site requirements that the applicant needs to address. These include: road widening along 112 and Bosonworth Avenues, and the construction of Bossonworth Avenue (currently a gravel road) to a rural standard. Engineering further advises that the location and design of each driveway be reviewed to avoid excessive driveway grades. Fire Department: Due to heavy tree cover, Fire requires adequate clearance to each future residential dwelling. When constructed, the driveways will need to be clear of vegetation 6 metres wide and minimum 5 metres high with a 5 metre wide drivable surface. CONCLUSION: It is recommended that Maple Ridge Zone Amending Bylaw No. 6965-2013 have second reading rescinded, be amended as identified in the staff report dated April 7, 2014, be given second reading as amended, and be forwarded to Public Hearing. "Original signed by Adrian Kopystynski" _______________________________________________ Prepared by: Adrian Kopystynski, MCIP, RPP, MCAHP Planner "Original signed by Christine Carter" _______________________________________________ Approved by: Christine Carter, M.PL, MCIP, RPP Director of Planning “Original signed by David Pollock” for _______________________________________________ Approved by: Frank Quinn, MBA, P.Eng GM: Public Works & Development Services "Original signed by J.L. (Jim) Rule" _______________________________________________ Concurrence: J. L. (Jim) Rule Chief Administrative Officer The following appendices are attached hereto: Appendix A – Subject Map Appendix B – Zone Amending Bylaw Appendix C – Site Plan City of Maple Ridge TO: Her Worship Mayor Nicole Read MEETING DATE: May 2, 2016 and Members of Council FILE NO: 11-5255-40-195 FROM: Chief Administrative Officer MEETING: C of W SUBJECT: Award of Contract ITT-EN16-23: 128 Avenue/Abernethy Way Road and Drainage Improvements (216 Street to 224 Street) EXECUTIVE SUMMARY: A primary arterial roadway, 128 Avenue from 210 Street to 232 Street provides east-west access across Maple Ridge to the Golden Ears Bridge and Lougheed Highway and is part of the TransLink Major Road Network. The widening of 128 Avenue to an ultimate four lane cross-section was identified in the 2014 Strategic Transportation Plan (STP) and is required as traffic volumes increased due to growth. The expansion of 128 Avenue is in the City’s approved Financial Plan with the construction of Phase I from 210 Street to 216 Street now substantially complete and Phase II from 216 Street to 224 Street proposed for 2016. The construction on 128 Avenue from 216 Street to 224 Street includes widening the roadway from two to four lanes with a paved three metre wide multi-use path and one metre wide gravel horse trail on the north side. The work generally consists of roadway construction, ducting for future fibre optic cable, street lighting, signal modifications, landscaping, stream and ditch relocation, and fish habitat and riparian restoration. The project construction is anticipated to commence in late May 2016 with substantial completion in November 2016. An Invitation to Tender was issued on March 23, 2016 and closed on April 22, 2016. The lowest compliant tender price was submitted by B & B Contracting (2012) Ltd. for $6,524,600.00 excluding taxes. There is additional work to be undertaken by City crews on the City water infrastructure; third party utility relocations; environmental monitoring and construction compliance reviews. Council approval to award the contract is required for the work to proceed. RECOMMENDATION: THAT Contract ITT-EN16-23, 128 Avenue/Abernethy Way Road and Drainage Improvements (216 Street to 224 Street), be awarded to B & B Contracting (2012) Ltd. in the amount of $6,524,600.00 excluding taxes; and THAT a construction contingency of $975,000.00 be approved to address potential variations in field conditions; and THAT the ISL Engineering and Land Services Ltd. contract for Engineering Design Services for 128 Avenue (Abernethy Way) from 210 Street to 224 Street, be amended to increase the budget by $250,000.00 for environmental monitoring and construction compliance services; and THAT the Financial Plan be amended to increase the project budget by $989,600.00 as detailed in the Council Report dated May 2, 2016 titled Award of Contract ITT-EN16-23: 128 Avenue/Abernethy Way Road and Drainage Improvements (216 Street to 224 Street); and further THAT the Corporate Officer be authorized to execute the contracts.1107 DISCUSSION: a)Background Context: A primary arterial roadway, 128 Avenue from 210 Street to 232 Street provides access across Maple Ridge to the Golden Ears Bridge and Lougheed Highway and is part of the TransLink Major Road Network. The widening of 128 Avenue to an ultimate four lane cross-section was identified in the 2014 Strategic Transportation Plan (STP) and is required as traffic volumes increased due to growth. The expansion of 128 Avenue is in the City’s approved Financial Plan with the construction of Phase I from 210 Street to 216 Street now substantially complete and Phase II from 216 Street to 224 Street proposed for 2016. The construction on 128 Avenue from 216 Street to 224 Street includes widening the roadway from two to four lanes with a paved three metre wide multi-use path and one metre wide gravel horse trail on the north side. The work generally consists of roadway construction, ducting for future fibre optic cable, street lighting, signal modification, landscaping, stream and ditch relocation, and fish habitat and riparian restoration. The project construction is anticipated to commence in late May 2016 with substantial completion in November 2016. There are significant water courses that parallel or cross 128 Avenue that will be relocated to the south side of the proposed roadway. Utility relocations by third parties such as BC Hydro are required as part of the project and are included in the project costs. Tender Evaluation An Invitation to Tender was issued on March 23, 2016 for the 128 Avenue/Abernethy Way Road and Drainage Improvements (216 Street to 224 Street) and closed on April 22, 2016. Six compliant tenders were received ranging from $6,524,600.00 to $8,765,041.75 excluding taxes as noted below, listed in order from lowest to highest price: Staff has reviewed the tenders and the lowest compliant bid is $6,524,600.00 from B & B Contracting (2012) Ltd. who has completed a number of projects with a similar scope as 128 Avenue/Abernethy Way Road and Drainage Improvements (216 Street to 224 Street) and is suitably qualified for the works. Staff undertook reference checks with other municipalities and BC Ministry of Transportation and Infrastructure to confirm B & B Contracting (2012) Ltd. is capable of completing the project successfully and these were positive. Tender Price (excluding taxes) B & B Contracting (2012) Ltd. $6,524,600.00 BD Hall Constructors Corp. $7,382,053.00 Eurovia British Columbia Inc. $7,754,632.23 Tybo Contracting Ltd. $8,210,858.00 Pedre Contractors Ltd. $8,423,000.00 Triahn Enterprises Ltd. $8,765,041.75 Consultant Construction Services The City will have a site representative responsible for the day-to-day quality assurance of the contractor’s work and coordination of all site issues. However, given the complex nature of the environmental, fisheries and drainage elements of the project, on-site field reviews and monitoring by the design consultant is required to support City staff as well as satisfy Engineer of Record requirements. The project consultant, ISL Engineering and Land Services Ltd. (ISL), has provided a contract administration proposal of $250,000.00 for the necessary civil, geotechnical, electrical and environmental services during construction. b) Desired Outcome: The construction of 128 Avenue from 216 Street to 224 Street will provide significant improvements to safety, convenience and accessible movement of people, goods and services. This project will also provide a strong multi-modal transportation system by promoting alternative modes (pedestrian, bike) of travel to reduce reliance on the automobile. c) Strategic Alignment: The 128 Avenue/Abernethy Way Road and Drainage Improvements Project supports the following key strategies identified in the City’s Strategic Plan:  Ensure that the transportation system is accessible to individuals of all ages and physical abilities.  Continue to address long-term safety of the City’s roadway network.  Support development of efficient connections between Maple Ridge, key gateways and other regional nodes to enhance regional mobility.  Expand the network of cycling routes within the City and connections to nearby municipalities.  Provide attractive pedestrian facilities in key pedestrian areas and provide for safe facilities along corridors for growing areas.  Ensure that the transportation system serves and supports growth plans within the City and work with the Ministry of Transportation and TransLink to support regional travel demands.  Develop a transportation system that minimizes impacts on the air quality within the City by supporting walking, cycling and transit. d) Citizen/Customer Implications: The estimated construction duration is approximately five months (100 working days) with construction commencing approximately two weeks after the project is awarded and is expected to be substantially complete by November 2016. The impact to everyday traffic, residents, and businesses in the neighbourhood will be minimized as much as possible. 128 Avenue is expected to remain open to traffic throughout construction. Work on roadways and interruption of traffic is prohibited during peak traffic periods of 6:00am – 9:00am and 3:00pm – 6:00pm. Single lane alternating traffic will be maintained at all times unless approved otherwise in the Traffic Management Plan. In-stream works for the two major culvert crossings will be completed within the fisheries window which extends from August 1 to September 15. The Contractor’s schedule will be monitored to minimize impact on properties and events along the 128 Avenue corridor. Impacted parties, as well as the general public will be informed of the construction progress through the City’s website and social media sources. e)Interdepartmental Implications: The Engineering, Operations, Parks and Planning Departments have provided input during the design stage and City resources have been used where possible in the interests of cost effectiveness and efficiencies. f)Business Plan/Financial Implications: The estimated project construction cost is $8,289,600 including all third party utility relocates, field reviews and monitoring by professional consultants, construction costs and contingencies. The projected costs and funding breakdown is as follows: Construction $ 6,524,600 Additional Consultant Services $ 250,000 Third Party Utility Costs $ 300,000 Operations $ 240,000 Construction Contingency $ 975,000 Grand Total $ 8,289,600 Existing Funding 128 Avenue (216 St to 224 St ) $ 7,300,000 Additional Funding Requested Accumulated Surplus $ 296,880 Development Cost Charges $ 692,720 Subtotal $ 989,600 Total Funding $ 8,289,600 This project is largely funded by Development Cost Charges (approx. 70%). The balance is funded through General Revenue and grant funding. The project expenditures include a contingency that will only be utilized if required to address unforeseen issues throughout construction. To accommodate this, the approval for an additional potential draw of $695,300 from Development Cost Charges is identified along with $297,990 from accumulated surplus is required. CONCLUSIONS: The tender price of $6,524,600.00 excluding taxes by B & B Contracting (2012) Ltd. for 128 Avenue/Abernethy Way Road and Drainage Improvements (216 Street to 224 Street) is the lowest compliant tendered price. It is recommended that Council approve the award of the contract to B & B Contracting (2012) Ltd. It is further recommended that Council approve a total budget of $8,293,290 to allow for City water and traffic works, consultant construction services, third party utility relocations, and a project contingency. “Original signed by Jeff Boehmer” “Original signed by Trevor Thompson” Prepared by: Jeff Boehmer, PEng. Financial Trevor Thompson, CPA, CGA Manager of Design & Construction Concurrence: Manager of Financial Planning “Original signed by David Pollock” Reviewed by: David Pollock, PEng. Municipal Engineer “Original signed by Christine Carter” for Approved by: Frank Quinn, MBA, PEng. General Manager: Public Works & Development Services “Original signed by E.C. Swabey” Concurrence: E.C. Swabey Chief Administrative Officer City of Maple Ridge TO: Her Worship Mayor Nicole Read MEETING DATE: May 2, 2016 and Members of Council FILE NO: 11-5255-20-060 FROM: Chief Administrative Officer MEETING: C of W SUBJECT: North Alouette and South Alouette Rivers Additional Floodplain Analysis Phase 2 - Technical Investigations Completion Final Report EXECUTIVE SUMMARY: Over the past decade flooding along the Alouette Rivers, especially the North Alouette River has become a concern for residents living in the floodplain. In 2007, extensive flooding prompted Maple Ridge to establish a multi-stakeholder Task Force for the Alouette Rivers floodplain to identify and compile information on flood issues in the area as well as develop a strategy to manage and/or improve the flood risks along the North and South Alouette rivers. On the recommendation of the Task Force, a hydrotechnical study was initiated to investigate and model both rivers, summarize the results in a report to improve the understanding of the river regimes, and help all parties with interests in the floodplain make informed future decisions. In January 2010, the City retained Northwest Hydraulic Consultants (NHC) to undertake an assessment of the North Alouette and South Alouette Rivers, develop the hydrotechnical model of the flood plain and prepare floodplain maps for both rivers. Staff developed a comprehensive plan based on recommendations from NHC to guide future flood management actions through a phased approach: Phase 1 – Data Review and Scoping: The first phase included a review of flood hazard problems and available information along with the development of a project scope for the technical investigations as the second phase. A final report for this phase was issued in January 2011, which was reviewed by staff. Phase 2 – Technical Investigations: The second phase included geomorphic assessments, climate and hydrologic analyses, hydraulic modelling of both rivers and floodplain, flood events and hazard mapping. An interim report for Phase Two was issued in May 2012 but limitations in accuracy of the river cross sections (supplied by BC Hydro as part of their dam breach modelling for the Alouette Dam) resulted in the model not being able to be calibrated. In 2014/15 NHC undertook a finely grained cross-sectional survey of the rivers and were able to complete the calibration of the model and finalize the Phase Two report. The report includes the updated hydraulic model, flood profiles and inundation mapping for different storm intensities ranging from a one-in-two year event up to a one-in-two hundred year event. The inundation maps indicate the extent of the floodplain affected by the flooding as well as the approximate water depths. 1108 Having a calibrated model now allows the City to determine the effect of any planned land changes in the floodplain. In 2012 the City adopted Policy 9.10 – “Regulation of Earth Fill within Floodplains” that requires applicants seeking to place fill or flood-proof lands within the floodplain to undertake a hydraulic assessment. With the current model a property owner with land in the floodplain can, for a fee have the City evaluate the impact on the floodplain, if any, and identify how to alleviate the impact. The “North Alouette and South Alouette Rivers Additional Floodplain Analysis Phase 2 – Technical Investigations Completion Final Report”, dated February 24, 2016 is attached for Council’s perusal. The amended Flood Construction Levels (FCL) will be utilized by City staff when reviewing proposed developments in the flood plain. The flood inundation maps will be incorporated into the City’s Emergency Response Plan and will assist in the development of guidelines for a flood recovery program. The consultant has proposed a third phase to the project that would utilize the calibrated model for the development of flood management strategies and flood damage mitigation options. This could include the development of a flood bylaw to improve flood resiliency, clarify flood proofing regulations and reduce flood risks in the long term as well as the development of a flood early warning system. These tasks will be brought forward for consideration in the next Financial Plan and Business Planning cycle. RECOMMENDATION: THAT the “North Alouette and South Alouette Rivers Additional Floodplain Analysis Phase 2 - Technical Investigations Completion Final Report, dated February 24, 2016” be endorsed. DISCUSSION: a)Background Context: The hydrologic regimes of the North and South Alouette Rivers are markedly different. The North Alouette is smaller and un-controlled and responds quickly to storm events, particularly large rain or rain-on-snow events. The much larger watershed of the South Alouette includes the Alouette Lake, controlled by BC Hydro, which is dominated by spring freshet type events. However, downstream of the dam, peak flows typically occur during the winter. Both rivers are dynamic and their channel geometry has changed over the past century; these changes are more apparent on the smaller, un-controlled North Alouette system. There is evidence that some aggradation may be taking place in the lower North Alouette study reach. The South Alouette River, that is controlled by BC Hydro, decreases peak flows downstream of the dam, has altered the natural geomorphology of this system, with some corresponding reduction in channel size. Over the past decade, flooding along the Alouette Rivers, especially the North Alouette River has become a concern for the residents living in the floodplain. In 2007, extensive flooding prompted Maple Ridge to establish a multi-stakeholder Task Force for the Alouette Rivers floodplain to identify and compile information on flood issues in the area as well as to develop a strategy to manage and/or improve the flood risks along the North and South Alouette rivers. The Task Force identified six focus areas: River hydrology, hydraulics and flood plain mapping Operation and maintenance Flood response Flood proofing and protection Data collection and information sharing, and Flood plain management roles and responsibilities. A hydrotechnical study was initiated to investigate and model both rivers, summarize the results in a report to improve the understanding of the river regimes, and help all parties with interests in the floodplain make informed future decisions. In January 2010, the City retained Northwest Hydraulic Consultants (NHC) to undertake an assessment of the North Alouette and South Alouette Rivers, develop the hydrotechnical model of the flood plain and prepare floodplain maps for both rivers. Staff developed a comprehensive plan based on recommendations from NHC to guide future flood management actions through a phased approach: Phase 1 – Data Review and Scoping: The first phase included a review of flood hazard problems and available information along with the development of a project scope for the technical investigations as the second phase. A final report for this phase was issued in January 2011, which was reviewed by staff. Phase 2 – Technical Investigations: The second phase included geomorphic assessments, climate and hydrologic analyses, hydraulic modelling of both rivers and floodplain, flood events and hazard mapping. An interim report for Phase Two was issued in May 2012 but limitations in accuracy of the river cross sections (supplied by BC Hydro as part of their dam breach modelling for the Alouette Dam) resulted in the model not being able to be calibrated. In 2014/15 NHC undertook a finely grained cross- sectional survey of the rivers and were able to complete the calibration of the model and finalize the Phase Two report. The report includes the updated hydraulic model, flood profiles and inundation mapping for different storm intensities ranging from a one-in-two year event up to a one-in-two hundred year event. The inundation maps indicate the extent of the floodplain affected by the flooding as well as the approximate water depths. Floodplain mapping corresponding to the 200-year flood was prepared for the North and South Alouette Rivers’ study area. The 200-year flood construction levels (FCLs) include a freeboard allowance of 0.6 m. The mapping also shows levels corresponding to the 25- year flood level including 0.6 m freeboard. Flood contours are based on the two- dimensional model output. The inundation boundaries were verified in the field by NHC staff and vary slightly compared to the previous mapping - reduced in a few areas and slightly increased in others. b)Desired Outcome: The Phase 2 report by NHC provides updated information regarding the Alouette floodplain that will assist both residents and the City. c)Strategic Alignment: The information compiled and floodplain maps developed as part of the present project form a key tool in meeting the Task Force objectives and aiding the City in moving forward to reduce potential future flood losses. d)Citizen/Customer Implications: The key benefits of the project are: Areas prone to flooding during different return period events are now identified and up‐to‐date Flood Construction Levels (FCLs) estimated. Over time, appropriate flood protection measures (structural and non-structural) can be developed for affected housing and long‐range improvements to infrastructure be planned. The hydraulic model forms a tool for evaluating the impact on flood levels caused by changes within the floodplain and the river channels. The effects on flood levels resulting from fill placement, new diking or development on the floodplain can be evaluated using the model. The benefits of enlarging bridge openings/ culverts or removing gravel depositions and debris can be also assessed. The hazard mapping can be used for issuing flood warnings to areas likely to be affected during particular events and for developing emergency response procedures. The maps indicate which roads will be most severely affected at a particular flow and safe access/egress routes can be identified. The mapping forms a public educational tool to inform residents regarding flood hazards and to provide guidance on improving residents’ safety. An important component of flood preparedness is flood recovery. (This was clearly demonstrated after the Calgary 2013 flooding, where recovery plans had been developed in advance.) The present mapping products will aid in developing flood recovery procedures. e)Interdepartmental Implications: The Engineering, Operations, Parks and Planning Departments have provided input during the analysis and modelling of the project. f)Business Plan/Financial Implications: The City’s investment in floodplain mapping products is of significant value and facilitates: Identification of present flood hazards Evaluation of any planned future changes in the floodplain/river channels Development of flood management tools CONCLUSIONS: The completion of the second phase of this project has produced a calibrated model that can be utilized by the City to assist individual property owners as well as larger flood management issues. It is recommended that “North Alouette and South Alouette Rivers Additional Floodplain Analysis Phase 2 – Technical Investigations Completion Final Report”, dated February 24, 2016 be endorsed. “Original signed by Velimir Stetin” Submitted by: Velimir Stetin, PEng. Project Manager “Original signed by David Pollock” Reviewed by: David Pollock, PEng. Municipal Engineer “Original signed by Christine Carter” for Approved by: Frank Quinn, MBA, PEng. General Manager: Public Works & Development Services “Original signed by E.C. Swabey” Concurrence: E.C. Swabey Chief Administrative Officer Att: North Alouette and South Alouette Rivers Additonal Floodplain Analysis Phase 2 – Technical Investigations Completion Final Report NORTH ALOUETTE AND SOUTH ALOUETTE RIVERS ADDITIONAL FLOODPLAIN ANALYSIS (FILE NO. 11_5255-20-60) PHASE 2 – TECHNICAL INVESTIGATIONS COMPLETION FINAL REPORT City of Maple Ridge, British Columbia 24 February 2016 NHC Ref. No. 300349 NORTH ALOUETTE AND SOUTH ALOUETTE RIVERS ADDITIONAL FLOODPLAIN ANALYSIS PHASE 2 – TECHNICAL INVESTIGATIONS COMPLETION FINAL REPORT Prepared for: City of Maple Ridge Maple Ridge, British Columbia Prepared by: Northwest Hydraulic Consultants Ltd. Vancouver, British Columbia 24 February 2016 NHC Ref No. 300349 Prepared by: Andromeda MacIsaac, EIT Vanessa O’Connor, PEng Hydrotechnical Engineer Hydrotechnical Engineer Reviewed by: Monica Mannerström, PEng. Principal DISCLAIMER This document has been prepared by Northwest Hydraulic Consultants Ltd. in accordance with generally accepted engineering practices and is intended for the exclusive use and benefit of City of Maple Ridge and their authorized representatives for specific application to the North Alouette and South Alouette Rivers Additional Floodplain Analysis Phase 2 – Technical Investigations Completion in Maple Ridge, British Columbia, Canada. The contents of this document are not to be relied upon or used, in whole or in part, by or for the benefit of others without specific written authorization from Northwest Hydraulic Consultants Ltd. No other warranty, expressed or implied, is made. Northwest Hydraulic Consultants Ltd. and its officers, directors, employees, and agents assume no responsibility for the reliance upon this document or any of its contents by any parties other than the City of Maple Ridge.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysisi Phase2–TechnicalInvestigationsCompletion FinalReport CREDITSANDACKNOWLEDGEMENTS TheNHCteamwouldliketothanktheCityofMapleRidgeforinitiatingthisstudy,makingavailable extensivebackgroundinformationandprovidingadviceandsupportthroughoutthestudy.KeyCity representativeswere: ƒVelimirStetin,PEngProjectManager ƒDavidPollock,PEngMunicipalEngineer ƒJeffBoehmer,PEngManagerofDesign&Construction  ThefollowingNorthwestHydraulicConsultantsLtd(NHC)personnelparticipatedinthestudy: ƒMonicaMannerström,PEngProjectManager,Reviewer ƒVanessaO’Connor,PEngProjectEngineer–HydraulicModelling ƒAndromedaMacIsaac,EITProjectEngineer–HydraulicModelling ƒSarahNorth,GISPGISSpecialist ƒAdrianChantler,PhD,PEngReviewer ƒTamsinLyle,PEngProjectEngineer(Phase1) ƒGuilhermedeLima,PhDProjectEngineer–HydraulicModelling(Phase1) ƒCharleneMenezes,PGeoGeormorphologist(Phase1)    NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysisii Phase2–TechnicalInvestigationsCompletion FinalReport EXECUTIVESUMMARY InJanuary2010,theCityofMapleRidge(theCity)retainedNorthwestHydraulicConsultants(NHC)to completeahydraulicassessmentandpreparefloodplainmapsfortheNorthandSouthAlouetteRivers. ThisassessmentfocussedonthefloodplainareaboundedbyParkLane,236thStreet,127thAvenueand 136thAvenue(Figure1). FloodingalongtheAlouetteRivershasbecomeasourceofincreasingconcernforMapleRidgeresidents inrecentyears.In2007,extensivefloodingpromptedthecreationofamultiͲstakeholdertaskforce.Its objectivesweretoidentifyandcompileinformationonfloodissuesandtodevelopastrategyto manage/reducethefloodriskalongtheNorthAlouetteandSouthAlouetteRivers. Inordertocompleteacomprehensiveplanthatcanguidefuturefloodmanagementactionsandadapt tocommunityneeds,theCityofMapleRidgehasadoptedaphasedprojectwhichallowsforthe adjustmentofprojectgoalsandobjectivesasfindingsaresummarisedandtoolsaredeveloped.The projectistobecompletedinthreephases: Phase1–DataReviewandScoping:Reviewoffloodhazardproblemsandavailableinformation. Scopingoftechnicalinvestigations.(ReportissuedinJanuary2011.) Phase2–TechnicalInvestigationsCompletion:Geomorphicassessments,climateandhydrologic analyses,hydraulicmodellingofriversandfloodplain,andhazardmapping.(Describedinthisreport, January2016.) Phase3ͲResultsAssessmentandReporting:Assessmentofmodellingresultsforthedevelopmentof floodmanagementstrategiesandflooddamagemitigationoptions.(Completionofadditionaltasks recommendedinthisreport.) ChannelcrossͲsectionsurveyscompletedin2014,highͲqualityLiDARdataalsofrom2014,andthe collectionofcalibrationdataduringthewinterof2014Ͳ2015,allowedfordevelopmentofa sophisticated2ͲdimensionalMIKEFloodnumericalmodel.Thehydraulicmodelwasusedforsimulating thefloodlevelscorrespondingtothe2,5,10,25,50,100and200Ͳyeareventsandthesubsequent generationoffloodextentandfloodhazardmappingfortheseflows.Theupdatedandimproved mapping,basedoncurrenttopographicinformation,recentflowestimatesandmuchimproved hydraulicmodellingmethods,ismoreaccuratethanthe1990floodplainmapsandshouldreplacethese. Thisreportpresentstheupdated200ͲyearfloodplainmapsfortheNorthandSouthAlouetteRiverstudy reachesanddescribestheirdevelopment.The200Ͳyearfloodlimitincludes0.6moffreeboardand determinestheupdatedfloodconstructionlevels(FCLs).Alsoincludedarethe25Ͳyearfloodlevels,with 0.6mfreeboard.Floodestimatesincorporatea10%increaseinflowsonallunregulatedbasinsfor projectedclimatechangeimpactstoyear2100.Downstreamboundaryconditionsweresettoalarge winterflowontheFraserRiver,whichincludesanallowanceforsealevelrise.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysisiii Phase2–TechnicalInvestigationsCompletion FinalReport TheCity’sinvestmentinfloodplainmappingproductsisofsignificantvalueandfacilitates:1)the identificationofpresentfloodhazards;2)evaluationofanyplannedfuturechangesinthe floodplain/riverchannels;and,3)developmentoffloodmanagementtools.Itisrecommendedthatthe Cityadoptstherevisedfloodplainmaps. RecommendationsforfuturetaskstobecompletedunderPhase3include: x Developmentoffloodbylaws. x Developmentofanearlywarningsystemforsevereflooding. x Developmentofanemergencypreparednessplan. x Developmentofafloodrecoveryprogram. x Completionofavulnerabilityassessmenttoidentifyhighriskareas. x Developmentandassessmentofdifferentfloodmitigationoptions. Thereportalsoincludesrecommendationsformaintainingandupdatingthehydraulicmodeland mappingovertime. Section9providesastudysummary,conclusionsandadescriptionoflongtermbenefitsoftheproject. SpecificrecommendationsareavailableinSection10.    NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysisiv Phase2–TechnicalInvestigationsCompletion FinalReport TABLEOFCONTENTS CREDITSANDACKNOWLEDGEMENTS............................................................................................................I EXECUTIVESUMMARY...................................................................................................................................II TABLEOFCONTENTS...................................................................................................................................IV LISTOFTABLES............................................................................................................................................VI LISTOFFIGURES..........................................................................................................................................VI LISTOFMAPS............................................................................................................................................VIII FLOODPLAINMAP.....................................................................................................................................VIII 1INTRODUCTION......................................................................................................................................1 1.1Background......................................................................................................................................1 1.1.1InitialPhase2Workin2011.......................................................................................................1 1.1.2FinalizationofPhase2in2015...................................................................................................2 1.2Terminology.....................................................................................................................................3 1.3ScopeofWork..................................................................................................................................3 1.4ReportOrganization.........................................................................................................................3 2GEOMORPHOLOGY................................................................................................................................3 2.1HistoricalPlanformChanges............................................................................................................4 2.1.1ImpactsofPlanformChanges.....................................................................................................4 2.2HistoricalCrossͲSections..................................................................................................................5 2.2.1CrossͲSectionAnalysis................................................................................................................5 2.2.2SpecificGaugeAnalysis...............................................................................................................6 2.2.3InstabilitySummary....................................................................................................................6 2.3ChangesinLandUse........................................................................................................................7 2.3.1ImpactsofLandUseChangesonHydroͲGeomorphology..........................................................7 3CLIMATE.................................................................................................................................................8 3.1.1AvailableData.............................................................................................................................9 3.1.2CurrentClimate...........................................................................................................................9 3.1.3HistoricTrends..........................................................................................................................10 3.1.4FutureClimate..........................................................................................................................11 4HYDROLOGY.........................................................................................................................................12 4.1AvailableData................................................................................................................................12 4.2GeneralHydrology.........................................................................................................................13 4.2.1NorthAlouetteRiver.................................................................................................................13 4.2.2SouthAlouetteRiver.................................................................................................................14 4.3HistoricTrends...............................................................................................................................16 4.3.1NorthAlouetteRiver.................................................................................................................16 4.3.2SouthAlouetteRiver.................................................................................................................16 4.4FrequencyAnalysisandDesignFlowHydrographs.......................................................................16 4.4.1NorthAlouetteRiver.................................................................................................................16 4.4.2SouthAlouetteRiver.................................................................................................................18 4.4.3TributaryInflows.......................................................................................................................20  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysisv Phase2–TechnicalInvestigationsCompletion FinalReport 4.4.4CoordinationofHydrographs...................................................................................................21 4.5DataLimitations.............................................................................................................................21 5COLLECTIONOFCALIBRATIONANDVALIDATIONDATA.....................................................................23 5.1November2014FloodEvent.........................................................................................................23 5.1.1ReviewofNovember2014Data...............................................................................................23 5.1.2November2014NorthAlouetteHydrograph...........................................................................24 5.2January2015Event........................................................................................................................24 5.2.1ReviewofJanuary2015Data....................................................................................................24 5.2.2January2015NorthAlouetteHydrograph...............................................................................25 6SURVEYOFCHANNELCROSSSECTIONS..............................................................................................25 7HYDRAULICMODELLING......................................................................................................................25 7.1DEMDevelopment.........................................................................................................................26 7.2MIKE11...........................................................................................................................................26 7.2.1Network....................................................................................................................................27 7.2.2CrossSections...........................................................................................................................27 7.2.3HydraulicStructures.................................................................................................................28 7.2.4ModelInflowsandWaterLevelBoundaries.............................................................................28 7.2.5MIKE11ModelCalibration........................................................................................................29 7.2.6MIKE11ModelValidation.........................................................................................................30 7.3MIKE21...........................................................................................................................................31 7.3.1ModelDevelopment.................................................................................................................31 7.3.2MIKE21ModelCalibration........................................................................................................33 7.4MIKEFlood......................................................................................................................................33 7.4.1MIKEFloodandMIKE21ModelCalibration..............................................................................33 7.4.2MIKEFloodandMIKE21ModelVerification.............................................................................34 7.5ModelLimitations..........................................................................................................................35 7.6ModelResults................................................................................................................................35 7.6.1SensitivityTesting.....................................................................................................................35 7.6.2DesignFloodModelling............................................................................................................36 7.6.3FloodHazardMapping..............................................................................................................38 8FLOODPLAINMAPPING.......................................................................................................................40 9PROJECTSUMMARY,CONCLUSIONSANDBENEFITS...........................................................................41 9.1SummaryandConclusions.............................................................................................................41 9.2ProjectBenefits..............................................................................................................................42 10RECOMMENDATIONS..........................................................................................................................43 10.1TechnicalRecommendations.........................................................................................................43 10.2FloodManagementRecommendations........................................................................................44 REFERENCES................................................................................................................................................46    NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysisvi Phase2–TechnicalInvestigationsCompletion FinalReport LISTOFTABLES Table1.LargestrecordedprecipitationeventsatPittPolder....................................................................10 Table2.LargestrecordedprecipitationeventsatHaneyUBCRF..............................................................10 Table3.SummaryofWSChydrometricgauges..........................................................................................12 Table4.LargestrecordedfloweventsontheNorthAlouetteRiver(1969–Present)...............................14 Table5.LargestrecordedfloweventsontheSouthAlouetteRiver(1984–Present)1.............................15 Table6.SummaryofannualflowfrequencyanalysisfortheNorthAlouetteRiverat232ndStreet........17 Table7.NorthAlouettedesigndischargehydrographswithclimatechangeimpacts...............................17 Table8.SummaryoffrequencyanalysisfortheSouthAlouetteRiveraboveAlouetteLake....................18 Table9.SummaryofAlouetteLakeinflowsanddesigndischargeoutflowstotheSouthAlouetteRiver.19 Table10.Tributarydesignhydrographpeakinstantaneousdischarges.....................................................20 Table11.Summaryoftributarywatershedareasandelevations..............................................................21 Table12.Summaryofflowsbyareafornearbygauges.............................................................................22 Table13.Summaryofbridgecrossings.......................................................................................................28 Table14.SummaryofMIKE11modelboundaries......................................................................................29 Table15.MIKE11calibrationpeakriverwaterlevelagreement................................................................30 Table16.SummaryofMIKE11roughnessvalues.......................................................................................30 Table17.MIKE11validationpeakriverwaterlevelagreement.................................................................31 Table18.Floodplainresistancevalues........................................................................................................32 Table19.MIKEFloodhighwatermarkwaterlevelagreement...................................................................34 Table20.Peakriverwaterlevelsforflowsensitivityanalysis....................................................................36 Table21.Peakriverwaterlevelsforroughnesssensitivityanalysis...........................................................36 Table22.Floodhazardratings....................................................................................................................38  LISTOFFIGURES Figure1Studyarea. Figure2Currentlanduse. Figure3NorthAlouetteRiveroverviewofgeomorphicfeatures. Figure4Historicalcrosssectionlocations. Figure5HistoricalcrosssectioncomparisonontheNorthAlouetteRiver. Figure6HistoricalcrosssectioncomparisonontheSouthAlouetteRiver. Figure7Specificgaugecurve–08MH006–NorthAlouetteRiver. Figure8Specificgaugecurve–08MH005–SouthAlouetteRiver. Figure9Historicalairphotosofstudyareainsequence. Figure10AlouetteRiverswatersheds. Figure11MeanmonthlytemperatureandprecipitationforAlouetteRiverswatershedgauges:Pitt Polder. Figure12MeanmonthlytemperatureandprecipitationforAlouetteRiverswatershedgauges:Haney UBCRFAdmin. Figure13Annualmaximumprecipitationevents:PittPolder. Figure14Annualmaximumprecipitationevents:HaneyUBCRFAdmin.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysisvii Phase2–TechnicalInvestigationsCompletion FinalReport Figure15Numberofrainydayeventsbyyear. Figure16Annualandwinterprecipitation:PittPolder. Figure17Annualandwinterprecipitation:HaneyUBCRF. Figure18Temperaturetrendsunderclimatechange. Figure19Precipitationtrendsunderclimatechange. Figure20MeanmonthlyflowsforNorthAlouetteRiverat232ndStreet. Figure21SummaryannualhydrographsforNorthAlouetteRiverat232ndStreet. Figure22MeanmonthlyflowsforSouthAlouetteRiverat232ndStreet. Figure23SummaryannualhydrographsforSouthAlouetteRiverat232ndStreet. Figure24MeanmonthlyflowsforSouthAlouetteRiveraboveAlouetteLake. Figure25SummaryannualhydrographsforSouthAlouetteRiveraboveAlouetteLake. Figure26DailyflowonNorthandSouthAlouetteRivers. Figure27Annualpeakdailyandinstantaneousflows:NorthAlouetteRiver. Figure28Annualpeakdailyseasonalflows:NorthAlouetteRiver. Figure29Numberofhighflowdaysbyyear:NorthAlouetteRiver. Figure30NorthAlouetteDesignFlowHydrographswithClimateChangeImpacts. Figure31STELLASystemsModelofAlouetteReservoirandDamͲOverview. Figure32DesignDischargeHydrographstoSouthAlouetteRiver. Figure33HydrographShapeSensitivity. Figure34Hypsometriccurvesfortributarywatersheds. Figure35StageͲdischargeratingcurveforAVAGaugeatPedestrianBridge:NorthAlouetteRiver. Figure36StageͲdischargeratingcurveforMapleRidgeGaugeat224thStreet:NorthAlouetteRiver. Figure37NorthAlouetteRiverNovember2014InflowHydrograph. Figure38NorthAlouetteRiverJanuary2015InflowHydrograph. Figure39MIKE11modelnetwork. Figure40November2014calibrationeventinflowboundaryconditions. Figure41November2014calibrationeventwaterlevelboundaryconditions. Figure42November2014calibrationatNorthAlouette232ndStreetBridge. Figure43November2014calibrationatNorthAlouetteAVAGauge. Figure44November2014calibrationatNorthAlouette224thStreetBridge(MapleRidgeGauge). Figure45November2014calibrationatSouthAlouette232ndStreetBridge(WSCGauge). Figure46November2014calibrationatAlouetteRiversconfluence(PittMeadowsGauge). Figure47January2015validationeventinflowboundaryconditions. Figure48January2015validationeventwaterlevelboundaryconditions. Figure49January2015validationatNorthAlouette232ndStreetBridge. Figure50January2015validationatNorthAlouetteAVAGauge. Figure51January2015validationatNorthAlouette224thStreetBridge(MapleRidgeGauge). Figure52January2015validationatSouthAlouette232ndStreetBridge(WSCGauge). Figure53January2015validationatAlouetteRiversconfluence(PittMeadowsGauge). Figure54MIKE21meshsurface. Figure55MIKE21modelroughness.   NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysisviii Phase2–TechnicalInvestigationsCompletion FinalReport LISTOFMAPS Map12ͲYearFloodDepths. Map25ͲYearFloodDepths. Map310ͲYearFloodDepths. Map425ͲYearFloodDepths. Map550ͲYearFloodDepths. Map6100ͲYearFloodDepths. Map7200ͲYearFloodDepths. Map82ͲYearFloodHazard. Map95ͲYearFloodHazard. Map1010ͲYearFloodHazard. Map1125ͲYearFloodHazard. Map1250ͲYearFloodHazard. Map13100ͲYearFloodHazard. Map14200ͲYearFloodHazard.  FLOODPLAINMAP 200ͲYearFloodExtentsIncludingFreeboard.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis1 Phase2–TechnicalInvestigationsCompletion FinalReport 1INTRODUCTION 1.1 Background TheCityofMapleRidge(City)retainedNorthwestHydraulicConsultants(NHC)inJanuary2010to completeahydraulicassessmentandpreparefloodplainmapsfortheNorthandSouthAlouetteRivers. ThisassessmentfocussedonthefloodplainareaboundedbyParkLane,236thStreet,127thAvenueand 136thAvenue(Figure1).CurrentlandusewithinthefloodplainisshowninFigure2. FloodingalongtheAlouetteRivershasbecomeasourceofincreasingconcernforMapleRidgeresidents inrecentyears.In2007,extensivefloodingpromptedthecreationofamultiͲstakeholdertaskforce.This taskforceincludedrepresentativesfromthemunicipality,relevantprovincialandfederalagencies, universitiesandthecommunityatlarge.Itsobjectivesweretoidentifyandcompileinformationonflood issuesandtodevelopastrategytomanage/reducethefloodriskalongtheNorthAlouetteandSouth AlouetteRivers. Inordertocompleteacomprehensiveplanthatcouldguidefuturefloodmanagementactionsandadapt tocommunityneeds,theCityofMapleRidgehasadoptedaphasedprojectapproachrecommendedby NHC.Thisapproachallowsfortheadjustmentofprojectgoalsandobjectivesasfindingsaresummarised andtoolsaredeveloped.Theprojectistobecompletedinthreephases: Phase1–DataReviewandScoping:Reviewoffloodhazardproblemsandavailableinformation. Scopingoftechnicalinvestigations.(ReportissuedinJanuary2011.) Phase2–TechnicalInvestigationsCompletion:Geomorphicassessments,climateandhydrologic analyses,hydraulicmodellingofriversandfloodplain,andfloodeventsandhazardmapping. (Thisreport,issuedJanuary2016.) Phase3ͲResultsAssessmentandReporting:Assessmentofmodellingresultsforthedevelopmentof floodmanagementstrategiesandflooddamagemitigationoptions. Phase1providedasummaryofthegeomorphology,climateandhydrologyoftheAlouetteRivers.For completion,someofthismaterialisincludedhere.Thegeomorphologyandtheclimateinformationhas notbeenupdated.However,someofthehydrologyhasbeenreviewedtoreflectrecenttrends. 1.1.1 InitialPhase2Workin2011 AninitialversionofthePhase2–TechnicalInvestigationsReportandExecutiveSummarywere submittedtotheCityofMapleRidgeinJune2011. AspartofthetechnicalinvestigationsintheinitialPhase2work,ahydraulicmodelwasdevelopedfor theNorthandSouthAlouetterivers(1Dflow)andfloodplain(2Dflow).Themodellingwasundertaken tosimulatearangeoffloodflowsuptothe200Ͳyeardesignfloodandtodevelopcorresponding  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis2 Phase2–TechnicalInvestigationsCompletion FinalReport inundationmappingfortherivers.GeometricdatainputtothemodelincludedrivercrossͲsections surveyedbyBCHydroandpartialDigitalElevationModel(DEM)dataofthefloodplain. TheBCHydroriversurveys,completedin2008,werecollectedtocarryoutdambreachmodellingfor theAlouetteDamaspartofabroadersafetyreviewofdamsinBC.ForconsistencywiththeBCHydro study,thesamerivercrossͲsectionssurveyedbyBCHydrowereinitiallyprovidedtoNHCforflood modelling.However,dambreachmodellingissignificantlydifferentfromfloodmodellinginthat extremeflowvolumesaresimulatedandwaterlevelsareassessedtoalesserdegreeofaccuracy. TheresultinginitialPhase2modelwasusefulforgeneraldemonstrationoffloodhazardsandassessing impactsofmajorfloodplainalterations,whichweresummarisedinthe2011ExecutiveSummary. However,duetothesimplifiedportrayaloftheriverchannels,themodelaccuracywaslowandthe modelwasnotconsideredsuitableforestablishingFloodConstructionLevels(FCLs)ordetailed inundationmapping. TheinitialPhase2modellingwasalsolimitedbyalackofsuitablecalibrationdata.Ideally,ahydraulic modelshouldbecalibratedtothehighestpossiblehistoricfloodif200Ͳyearfloodsimulationsaretobe performed.Bothflowmeasurementsandsurveyedhighwatermarksareneededforthecalibration event.AlthoughbothrivershaveWaterSurveyCanada(WSC)hydrometricgauges,thegaugesoftenfail duringpeakflowsandobservedhighwatermarksarelimited. 1.1.2 FinalizationofPhase2in2015 On31May2013,theCityofMapleRidgeandNHCmettodiscussthestatusofworkcompletedtodate, whatwouldberequiredtocompletePhase2andfinalizethestudyandhowtheCitycouldbestmove forwardwithfloodmanagementoftherivers.Asaresultofthemeetingdiscussions,NHCrecommended anewscopeofworktoenhanceandexpandonfindingsfromtheinitialprojectwork. ItwasagreedthatNHCwouldresurveythechannelsinmoredetailandatareducedspacing.Thenew (2014)surveyfocusedonthepreviouslydefinedprojectarea(roughly5kmlongreachesofbothrivers) andwascarefullylaidouttocapturetheconstrictedchannellocationsthathavethegreatestimpacton watersurfaceprofiles.Inaddition,theCitycollectedupͲtoͲdateLiDARdatafortheentirefloodplainto bemodeled. Aprogramwasalsoinitiatedallowingforthecollectionofmorecalibrationdataoverthewinterof2014 Ͳ2015.Thisprogrammonitoredpeakflows,quicklymobilizingafieldcrewduringhighfloodstomeasure flowsandmaphighwaterlevels.Thedatacollectedfromthisprogramhasbeenusedtorecalibrateand validatethePhase2model. ThisreportsummarizesthefinalizedresultsofPhase2–TechnicalinvestigationsCompletion,including theupdatedhydraulicmodel,floodprofilesandinundationmapping.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis3 Phase2–TechnicalInvestigationsCompletion FinalReport 1.2 Terminology TodistinguishclearlybetweenthetwoAlouetteRivers,theAlouetteRiverisreferredtoastheSouth AlouetteRiverinthisreport;theNorthAlouetteRiverkeepsitsofficialname. 1.3 ScopeofWork AspertheCityofMapleRidgetermsofreference,thescopeofservicesforthePhase2Completion Workcomprised: ƒReviewofpastworkandnewdataavailable, ƒCollectionofcalibrationdata, ƒNewsurveyofchannelcrossͲsections, ƒUpdateofexistingMIKEFloodmodel, ƒFloodplainmapping,and ƒEnhancementandreissueofthePhase2report. 1.4 ReportOrganization Inadditiontotheintroduction,backgroundinformationandscopeofworkincludedinSection1,Section 2providesareviewoftheNorthandSouthAlouetteRivergeomorphology.Theclimateandhydrologyof thesystemareincludedinSections3and4,respectively.Calibrationdatacollectionisoutlinedin Section5,thechannelsurveysinSection6andthehydraulicmodellingofthesystemisdiscussedin Section7.Section8summarizesthefloodplainmappingforthestudyarea,followedbysummaryand conclusionsinSection9andrecommendationsinSection10. 2 GEOMORPHOLOGY ThegeomorphicsettingandasummaryofthefluvialgeomorphologyofboththeNorthandSouth AlouetteRiverswaspresentedinthePhase1reporting.Thissectionsummarizespreviousanalyses completedtomeettheevaluationobjective: Assessifmorphologyofrivershaschangedovertime.Ifso,examinetheimpactofthese changesonthefloodhazard. Giventheaboveobjective,historicalchangestotherivers’morphologywasexaminedbylookingat historicalairphotosandmapping(planformchanges),andbylookingatchangestobedlevels(section changes).Changestothelanduseofthesurroundingwatershedswerealsoreviewed.Theresultsof theseanalysesarepresentedbelow.ItshouldbenotedthattheSection2geomorphicassessmentwas  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis4 Phase2–TechnicalInvestigationsCompletion FinalReport completedduringinitialPhase2workin2011andhasnotbeenupdatedtoincludethecrosssections collectedbyNHCin2014. 2.1 HistoricalPlanformChanges AvailableairphotographswerescaledandrectifiedusinggeoͲreferencingtools.Subsequently,bank linesforalltheyearsofphotographyweredigitizedbasedontheedgeofvegetation.Overlayingthese layersinGISallowedfortheevaluationofplanformchangesovertime. OntheNorthAlouetteRiversystem,therehasbeensignificantchannelchange,particularlybetweenthe 232ndSt.Bridgeandthe132ndAve.Bridge(Figure3).Althoughanecdotalevidencesuggestsgreater recentinͲchanneldepositionobservedthroughthegrowthandexpansionofbarfeatures,these sedimentaccumulationsaretransientandarelikelytobemobilizedinthenexthighflowevent.A possibleexceptionoccursneartheconstrictionintheNorthAlouettechanneldownstreamofthe224th StBridge:sedimentaccumulatingupstreamofthebridgemaybeslowertoflushdownstream.Bedform changesarenowexpectedatthe232ndStreetbridgecrossingasanewsinglespanbridgewas constructedin2013.Asthebridgeclearancewasincreasedandtheoldpierswereremoved,conveyance atthislocationhasbeensubstantiallyincreased,loweringwaterlevelsforsomedistanceupstreamof thebridge. Since1959,theSouthAlouetteRiverchannelhasexperiencedsomelateralmigration,mainlyat meanderbends.AtthelargebendatMapleRidgePark,fieldobservationsverifythatsignificanterosion ofwidesectionsalongtheright(north)bankhasoccurred.Conversely,pointbarfeaturesalonginner banksoftheSouthAlouette–oneatthefirstlargebenddownstreamof232ndStandanother, immediatelyupstreamofthe224thStBridge–becameincreasinglyvegetatedandestablishedbetween 1959and1974. 2.1.1 ImpactsofPlanformChanges Ingeneral,ameanderingplanforminvolveschannelshiftingthrougherosionontheoutsideofbends anddepositionontheinside.Bankretreatasaresultofthiserosionhasbeenobservedbothonthe NorthandSouthAlouetteRiversystems.ThepropertyonthenorthbankoftheNorthAlouettejust upstreamofthe224thStBridgeisaffectedbythisprocess.OntheSouthAlouette,thishasbeen occurringonthenorthbankalongMapleRidgePark. Landlossisbalancedbythedevelopmentofbarformsalongtheoppositebank.TheinͲchannel depositionhasbeenaconcernlocallyontheNorthAlouetteRiversystem.Theaggradationofthe channelbedͲeveniftemporaryͲcancontributetohigherwaterlevels,andincreasetheseverityof floodingduringhighflowevents. Incontrast,theestablishmentofvegetationonpointbarsontheSouthAlouetteRiversuggeststhatthe channelbedhasbecomemorestablepresumablybecauseofreducedsedimentinputfromupstream relatedtoriverregulationbyBCHydro’sAlouetteDam.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis5 Phase2–TechnicalInvestigationsCompletion FinalReport 2.2 HistoricalCrossͲSections TheProvincesurveyed68sectionsoftheNorthAlouetteandSouthAlouetteRiversin1981,whichwere usedinthe1991floodplainmappingstudy.Horizontalpositionsfor1981crossͲsectionswererecorded toalesspreciselocaldatum.In2008,BCHydroconductedextensivesurveysofbothriversaspartof theirAlouetteDamFloodSimulationandMappingproject;109sectionsweresurveyedfromthedamto themouthoftheriverstogeodeticdatum.Figure4showsthelocationsofthe1981and2008crossͲ sectionsinthestudyarea. TherewerelimitationstotheprecisequantitativeanalysisofcrossͲsections.Assectionsweresurveyed atdifferentlocationsin1981andin2008,directcomparisonofcrossͲsectionswaslimited.Although crossͲsectionsatbridgelocationswereconsistentlysurveyed,bridgereplacementsintheintervening periodmayhavealteredsomesections.Forinstance,the132ndAve.BridgeacrosstheNorthAlouette Riverwasreplacedin1995andthe232ndStreetbridgewasreplacedin2013.OntheSouthAlouette River,the232ndSt.Bridgewasbuiltin2004andthe224thSt.Bridgein1995.Attwolocationsonthe SouthAlouette,crossͲsectionsthatdonotlieatbridgecrossingsweresurveyedattheidenticallocations butwithdifferentorientationsacrossthechannel,complicatingdirectcomparison. 2.2.1 CrossͲSectionAnalysis Figure5andFigure6showhistoricalcomparisonofcrossͲsectionscollectedontheNorthandSouth AlouetteRiversrespectively. TheNorthAlouetteRivershowsgreaterchangewithincrossͲsectionsthantheSouthAlouetteRiver.The riverhasthepotentialtomovelargequantitiesofrelativelyunconsolidated,glaciofluvialtill,which formstheregion’ssurficialgeology,becauseoftheerodibilityofthematerialandthegradientofthe channelheadwaters.Thissedimentiscarrieddownstreamanddepositedonthefloodplain;itistypically reͲmobilizedinsubsequenthighflowevents.Asaresult,channelgeometryvariesassedimentis depositedandlatertransportedfurtherdownstream.Atboththe224thSt.andthe132ndAve.bridges acrosstheNorthAlouette,thecrossͲsectionsclearlyshowthattheriverbedhasaggradedbetween1981 and2008,withdepositionontheorderof1m.Thereachbetween232ndStand224thStisexpectedto beadepositionaloneowingtoitslowgradient,althoughthenew2013232ndStreetbridgeshould greatlyincreaseconveyance.Theamountofdepositionisprimarilyinfluencedbytheavailabilityof sedimentfromupstream.Sedimentaccumulatedalongtherightbankatthe224thStcrossingmayhave beenremovedbydredging(August6,1997)therebyexplainingtheretreatedrightbankprofilein2008. IncomparisontotheNorthAlouette,crossͲsectionsonthelargerSouthAlouetteRiver(Figure6)show lessvariationinbedtopography.ThereisaslightloweringofthechannelbedatcrossͲsectionsinthe upperreach,particularlyupstreamofthe232ndStBridge;thetwolowerreachcrossͲsectionsexhibit somedeposition,mainlyatthethalweg.Thisisexpectedasthereisamarkedchangeinchannelgradient from0.7%to0.3%,andconsequently,instreamenergy,betweenthetworeaches.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis6 Phase2–TechnicalInvestigationsCompletion FinalReport 2.2.2 SpecificGaugeAnalysis AspecificgaugeanalysiswasconductedforthetwoWaterSurveyCanada(WSC)hydrometricgauges availableinthestudyarea;oneoneachoftheNorthandSouthAlouetteRivers.Specificgaugeanalyses areconductedbylookingatmeasuredflowsandwaterlevelsatthegaugesitetocheckfortrendsover time.Over600recordsofsitevisitsbyWSCwereexaminedandcompiledtocompletethisanalysis.On theNorthAlouetteRiverover450recordsfrom1911through2003wereexamined;only7recordsare availablefortheperiodfrom1911to1959.FewerrecordsareavailablefromtheSouthAlouettegauge, 180plusrecordswereexaminedstartingin1977.Therecordsweregroupedbydischarge,andwater levelsovertimewereplotted. ResultsofspecificgaugeanalysescarriedoutonthetwoWSCgaugesshowsometrendsinwaterlevels overtime.AtWSCgauge08MH006ontheNorthAlouetteRiver,waterlevelsforaspecificdischarge havedecreasedbetween1961and2003(Figure7).Thisimpliesdegradationofthechannelbedatthe 232ndSt.crossing,wherethegaugeislocated,orinthedownstreamreachcontrollinglevelsatthis point.The232ndSt.Bridgelikelyactedasachannelconstrictionresultinginhighflowvelocitiesscouring thebedatthegaugesection,particularlyathighflows.Apossiblesecondaryexplanationisthathigh flowstravellingdownthesteepvalleyslopeareabletomobilizeanysedimenttemporarilydepositedat thissection,transportingitdownstreamtowardsthe132ndStand224thStbridgeswhereaggradation hasbeennoted.Itshouldbenotedthatthenewestreplacementofthebridgein2013mayhave changedtheratingrelationshippostthisanalysis. TheSouthAlouettegauge08MH005islocatedontherightbankat232ndSt.Tosomeextent,thebridge replacementin2004couldhaveaffectedtheratingrelationship.Aspecificgaugeanalysissuggeststhat thechannelhaspartlyaggradedaswaterlevelshaveincreasedbetween1977and2003forflowsless thanthemeanannualflowof3.5m3/s(Figure8).Atflowsinthemeanflowrangethechannelis relativelystable(i.e.thetrendlinesareeffectivelyflat).ThissuggeststhatoutsidethelowͲflowchannel, theriverisnotchangingsignificantly.However,athigherdischarges,thechannelmaybedegradingas suggestedbythecrossͲsectioncomparison.Unfortunately,therearetoofewdischargemeasurements takenathighflowstoallowforaccuratecomparison.Also,the2008crossͲsectiondoesnotextendfully totherightbanktoprovidecompleteevidence.Priortodamconstruction,muchlargerflowsshapedthe riverchannelandforthecurrent,reducedflows,thechannelisoversized.Upstreamtributariesmay havecontributedsomesedimenttoraisingthebedlocally,despitetheoverallreducedsedimentsupply pastthedam. 2.2.3 InstabilitySummary Bothriversaredynamicandhavechangedoverthecourseofthelastcentury;thesechangesaremore apparentonthesmaller,unregulatedNorthAlouettesystem.TheregulationoftheSouthAlouette system,whichdecreasespeakflowsdownstreamofthedam,hasalteredthenaturalexpectedchanges tothesystem.Unfortunately,thelackofconsistenthistoricsurveydataandhighflowdischarge measurementsmeanthatdrawingconclusionsregardingtheoverallpatternofaggradationor degradationisdifficult.Bridgesitesgenerallyconstrictflowandcanconsequentlycausedegradationat floodflows,whichappearstobethecaseatthetwogaugesites.AlthoughthecrossͲsectioncomparison  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis7 Phase2–TechnicalInvestigationsCompletion FinalReport isquitelimited,thereisreasonableevidencethatsomeaggradationmaybetakingplaceinthelower NorthAlouettestudyreach. 2.3 ChangesinLandUse Changestolandusewithinthewatershedcanhavealargeimpactonrivermorphology.Forexample,an urbanisedareawillgenerallycreatemorerunoffandstreampower,whichcanchangetheriver structure.LandswithinthestudyareaintheCityofMapleRidgehavebeenconvertedfromprimarily foresttoamixofagricultural,commercialandresidentiallandusesinceincorporation(Figure2).Much ofthisareaalsolieswithintheAgriculturalLandReserve(ALR),andassuchisprotectedfrommajor changesassumingtheregulatoryregimeremainsineffect. Historicalairphotosfrom1959,1974,and1989werereviewedtoidentifypastchangesinlanduse withinthewatershedandtheresultingimpacts.AdditionalhistoricalimagerywasavailablefromGoogle Earthfortheyears2004and2008andprovidedamorecomprehensiveanalysisofchange.Figure9 showsthehistoricalairphotoimagesinsequence. ƒInthe1959airphoto,landhasbeenclearedforfarmingandsomelowdensityresidential developmentnortheastof224thSt.and136thAve.intersection.Landhasbeenclearednorth of132ndAve.,between232ndSt.and224thSt.,forhousing.ClearingoflandintheSilver Valleyareahasalsobegun. ƒThe1974airphotoshowsnosignificantincreaseinlandclearedsince1959.Thedensityof residentialdevelopmentisincreasingsouthof128thAve. ƒThe1989airphotoshowssignificantclearingofthelandbetweenNorthandSouthAlouette Rivers,includinglossofriparianvegetationalongthenorthbankoftheNorthAlouetteand alongthesouthbankoftheSouthAlouette.LandhasbeenfurtherclearedinSilverValleyto accommodatenewhouses. Inthe2004airphoto,clearingsintheSilverValleyareahaveexpandedandthisisaccompaniedbythe startofconstructionofanewresidentialsubdivision.Afarmoperationhasalsobeenbuiltalong232nd St.betweenNorthandSouthAlouetteRivers.Aswell,thereismoredenseresidentialdevelopment southof124thAve.between232ndSt.and224thSt.Cranberrybogshavebeencreated,adjacenttothe NorthAlouetteRiveranddownstreamof224thSt.,throughtheconstructionofdikes(beyondtheimage extentsonFigure9). The2008airphotoshowsthecontinuedconstructionofhousesaspartofthedevelopmentofa residentialsubdivisioninSilverValley. 2.3.1 ImpactsofLandUseChangesonHydroͲGeomorphology LargeͲscalelandconversionfromforesttomediumͲdensityresidentialdevelopmentintheSilverValley areahaslikelyimpactedtheNorthAlouetteriversystemdownstreamof232ndSt.tosomeextent.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis8 Phase2–TechnicalInvestigationsCompletion FinalReport Increasedsedimentavailabilityandincreasedrunoffaretwotypicaleffectsoflanddevelopment.There isasignificantbreakinchannelslopeapproximately500mupstreamofthe232ndSt.crossingwherethe riverleavesthemountainvalleyandentersthebroad,alluvialplain.Availablesedimentistransported downthesteephillslope,andsubsequentlydepositedinthelowͲgradientchannelbelow.Alongthe SouthAlouetteRiver,theurbanizationoflandsouthof124thAve.mayhaveresultedinsomewhat increasedstreamflowsinthetributariesduetoreducedinfiltration,andpotentiallyincreasedsediment conveyedtothemainchannelfromthetributariesasaresultofgrounddisturbanceandincreased runoff.However,adetailedassessmentofstormwaterrunoffwasnotcarriedout. TributariestotheNorthAlouetteRiverhavelikelyalsobeenimpacted.Developmentofthearea between224thSt.and232ndSt.,northof136thAve.,hasalteredthenaturaldrainagepatternandpathof CattellBrooktributary.Itsflowhasbeendirectedthroughculvertsandditchesexcavatedalong224thSt., whichappeartobeinadequatelysizedtoaccommodateflowfromtheNorthAlouetteRiverwhenit overtopsitsbanks. ThehydraulicsoftheNorthAlouettesystemhasbeenalteredbylargewetlandspartiallybeing convertedtobogstoaccommodatecranberryproduction.Therelatedconstructionofdikeshasreduced thefloodplainwaterstorageareaavailabletotheNorthAlouetteRiverduringfloodperiods. 3 CLIMATE CharacterizationoftheclimateoftheNorthandSouthAlouettewatershedsplaysanimportantrolein thedevelopmentoffloodmappingandfloodmanagementplans.MapleRidge,inthelowerreachesof theNorthandSouthAlouettewatershedsenjoysamild,temperatecoastalclimate.Meandaily temperaturesvaryfrom2°Cinthewintermonthstojustover17°Cattheheightofsummer.Theregion hasasignificantannualprecipitationofapproximately2,200mm,withmostoftheprecipitationfalling asrainbetweenOctoberandMarch;thesummersarerelativelydry. TheSouthAlouettewatershedincludesalargemountainousregion,withpeaksextendingupto1,800m elevation.Theclimateinthispartofthewatersheddifferssignificantlyfromthelowerreaches.The coastalmountainsreceivesignificantprecipitation,muchofwhichfallsassnow.Thiscanresultinlarge flowsinthespring,whensnowinthemiddleandupperelevationsmelts.Inthefallandwinterwhen warmcoastalfronts(sometimesreferredtoasa“pineappleexpress”)bringwarmmoistairtothe region,riversswellwithstormwaterinadditiontomeltwaterfromtheserainͲonͲsnowevents.Manyof theNorthandSouthAlouetteRivers’majorfloodeventshavebeenasaresultofthistypeofstorm. ItshouldbenotedthattheSection3climateassessmentwascompletedduringinitialPhase2workin 2011.Norecordbreakingprecipitationeventshavetakenplacesince2011.    NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis9 Phase2–TechnicalInvestigationsCompletion FinalReport 3.1.1 AvailableData EnvironmentCanadamaintainsfouractiveclimatedatagaugesinandneartheAlouettewatershed basins(Figure10): 1) PittPolder(CI1106180),Elevation5m 2) HaneyUBCRFAdmin(CI1103332),Elevation147m 3) HaneyEast(CI1103326),Elevation30.5m 4) KanakaCreek(CI1104R02),Elevation70m Datafromthesesiteshasbeenusedtoestablishgeneralclimateindicatorsforthewatersheds. Historictemperatureandprecipitationrecordsforeachofthefourgaugesinthevicinityofthe watershedswereanalysed.Afterinitialassessments,thetwomosteasterlygauges(HaneyEastand KanakaCreek)wereeliminatedfromfurtheranalysis.Thesetwogaugeslieoutsidethewatersheds,and showsignificantlydifferentannualprecipitationvolumesthanthegaugesinsidethewatersheds.The analysisisthereforefocusedondatafromthePittPolderandHaneyUBCRFAdmingauges;these provideexcellentinsightintotheclimateofthelowerandmidelevationwatersheds,butprovidelimited informationastotheclimateoftheupperwatersheds.Precipitationandtemperaturerecordsforthe twogaugesdatebackto1951. 3.1.2 CurrentClimate ThePittPolderandHaneyUBCgaugesshowsimilarpatternsoftemperatureandprecipitation(Figure11 andFigure12).Meanmonthlytemperaturesrangefromjustover2°Cinthewintertoaround18°Cin thesummer.Precipitationpatternsfollowgeneraltemperatecoastalpatterns,withthegreatest precipitationamountsfallingbetweenOctoberandMarch;averagemonthlyprecipitationisaround 300mmforthisperiod.Thesummersarerelativelydry,withmonthlyprecipitationvolumesofaround 75mm.Themajorityofprecipitationfallsasraininthelowerwatershed;smallamountsofsnoware observedonceortwiceayear.TotalaverageannualprecipitationatthePittPoldergaugeis2,230mm and2,150mmattheHaneyUBCRFgauge. Intheupperwatershedageneralpatternofhighprecipitation,coldwintersandlowprecipitation,and highertemperaturesummersisexpected.However,temperaturesaregenerallylowerbyasmuchas15 degrees,andprecipitationvolumesarehigherthanatlowerelevations.Muchofthewinter precipitationfallsassnow,andisstoredintheupperwatersheduntiltheairheatsupinthespringand summer.ThisgivesrisetothenivalhydrologicregimeontheSouthAlouetteRiver;whereflowspeakin thespringduringthesnowmeltperiod.TheNorthAlouetteRiverwatershedisoverallmuchlowerin elevation,anddoesnothavehighvolumesofsnowstoredinthemountains.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis10 Phase2–TechnicalInvestigationsCompletion FinalReport 3.1.3 HistoricTrends Accordingtosomeobservers,thehydrologyoftheAlouetteRivershaschangedovertime,particularlyin recentyears.Toinvestigatepotentialchangesinthehydrology,longtermtrendsinprecipitation recordswereassessed.FloodingontheAlouetteRiverscanresultfromanintensesingleday precipitationevent,butismorecommonlyattributabletolongerperiodsofprecipitation.Therefore, shortduration(1Ͳday),mediumduration(3Ͳday)andlongduration(5Ͳday)precipitationeventswere calculatedforthePittPolderandHaneyUBCRFgauges.TheresultsarepresentedinTable1,Table2, Figures13and14. Table1.LargestrecordedprecipitationeventsatPittPolder. Rank1ͲDay3ͲDay 5ͲDay Preci p DatePrecip (mm) DatePrecip (mm) Date 1143.8November2,1955258.0 January17Ͳ19,1968 336.4 January15Ͳ19,2005 2142.6October16,2003253.6 January15Ͳ17,2005 287.0 January16Ͳ20,1968 3134.1January18,1968248.5 November7Ͳ9,1989 280.2 October16Ͳ20,2003 4131.0February23,1986248.4 October15Ͳ17,2003 278.0 November5Ͳ9,1989 5126.0December8,1956231.4 December7Ͳ9,1956 271.6 December13Ͳ17, 6117.9December22,1963226.1 April27Ͳ29,1959 271.5 November8Ͳ12,1990 7115.0January3,1984221.5 November8Ͳ10,1990 258.0 February12Ͳ16,1982 8115.0November9,1989211.1 November1Ͳ3,1955 253.0 Dec27ͲJan1,1963 9109.6July11,1983206.5 February22Ͳ24,1986 249.0 December14Ͳ18, 10106.0October9,1995205.0 December15Ͳ17,1966 247.9 April24Ͳ29,1959  Table2.LargestrecordedprecipitationeventsatHaneyUBCRF. Rank1ͲDay3ͲDay 5ͲDay Preci p DatePrecip (mm) DatePrecip (mm) Date 1145.8October16,2003256.8 March17Ͳ19,1997 287.1 October16Ͳ20,2003 2127.2March17,1997249.5 October15Ͳ17,2003 286.1 December13Ͳ17, 3125.2January18,1968238.2 January18Ͳ20,1968 283.8 March15Ͳ19,1997 4119.2December13,1979227.2 January17Ͳ19,2005 279.6 January16Ͳ20,2005 5115.0February23,1986220.0 November8Ͳ10,1990 263.0 January16Ͳ20,1968 6106.7December25,1972190.2 December15Ͳ17,1966 263.0 November8Ͳ12,1990 7104.0January17,2005187.0 November7Ͳ9,1989 259.0 December21Ͳ25, 8101.0January1,2007186.7 November12Ͳ14,1998 241.1 February12Ͳ16,1982 998.4January3,1984182.6 February12Ͳ14,1982 229.8 December14Ͳ18, 1098.0July11,1983180.7 February22Ͳ24,1986 227.5 November11Ͳ15,   NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis11 Phase2–TechnicalInvestigationsCompletion FinalReport Thetwogaugesshowvariedresults,withtypicallyinconsistentrankingofthelargeevents.The consistentlargeeventsincludeJanuary2005,October2003andJanuary1968. Thelargesteventsineachyearwereanalysedtoseeiftherewasanyobservableincreaseinrain volumesandnumberofeventsperyearoverthecourseofthegaugerecord.Figure13andFigure14 showpeakannualprecipitationevents;noincreaseineventvolumeisobserved.Thiswascorroborated bycheckingforthenumberofheavyraindaysperyearsincethe1950s;atypicalheavyprecipitation eventthatmightresultinflooding.AthresholdrainyͲdaywasestablishedtobethe2Ͳyear,1Ͳdayevent, whichis82mmand78mmforthePittPolderandHaneyUBCRFgaugesrespectively.Thetotalnumber ofdayswithraininexcessofthisispresentedinFigure15.Thechartshowsnoobservabletrendover time,thoughitdoesclearlyshowthattherainiestyearsatbothgaugeswere1968,1997and2007. Furthermore,longͲtermtrendswereexaminedbylookingatthedeviationfromnormalannualand winterprecipitation(Figure16andFigure17).Inlinewiththeearlieranalyses,therearenodetectable trendsovertheperiodofrecord. Insummary,therehavebeenanumberofsignificantprecipitationeventsinMapleRidgeovertheyears. However,thedataavailabletodatedoesnotconclusivelyshowthattherehasbeenanincreaseineither theintensityorfrequencyofprecipitationevents.Thisconclusionisingeneralagreementwiththe hydrologicanalysispresentedinSection4. 3.1.4 FutureClimate GeneralclimatetrendswereidentifiedbyusingtheClimateBCdownscalingtooldevelopedbyUBCand theBCMOF(ClimateBC2006).Usinglocationandelevationasinput,NHCcollectedandanalysedgeneral temperatureandprecipitationtrendsforMapleRidgeunderthreeclimatechangescenarios.(Itshould benotedthatupdatingtheseclimatetrendswasnotincludedintheprojectscope). UsingtheClimateBCtool,keylongͲtermclimatevalueswereestimatedforthreecommonlyusedglobal circulationmodelsdefinedinthesoftware.Theglobalcirculationmodelspredictdifferentoutcomes overtime.Resultsfromthethreepresentedmodelscanprovideanideaofthevariationinpossible futureclimateoutcomes.MeanannualtemperaturesfortheCityareexpectedtorisebetween2.5°C and3.5°Coverthecourseofthenext60years;summermaximumdailytemperaturescouldrisetowell over30°CfromthepresentdaymidͲtwenties(Figure18).Overallannualprecipitationisexpectedtorise minimally;however,seasonalvolumeswillchangeconsiderably(Figures19aand19b).Ahigher proportionoftheannualprecipitationwillfallduringtheautumnandwinter,whichhassignificant implicationsforraindrivenfloodeventsintheAlouettesystem.Underthemostextremescenario (GCM_A2x)thisyieldsa10%increaseinwinterprecipitationvolumes,avaluerecommendedinthe ProfessionalPracticeGuidelines–LegislatedFloodAssessmentsinaChangingClimateinBCbyAPEGBC foryear2100conditions.Thisincreaseisappliedtotheclimatechangescenariosinthenumerical modelling.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis12 Phase2–TechnicalInvestigationsCompletion FinalReport 4HYDROLOGY ThehydrologicregimesoftheNorthandSouthAlouetteRiversaredistinct.TheNorthAlouette,being smaller(drainageareaof37.3km2)andunregulated,respondsquicklytostormevents,particularlylarge rainevents.ThemuchlargerwatershedoftheSouthAlouette(totaldrainageareaof234km2)includes significantmountainousterrainandtheregulatedAlouetteLake.Thehydrologicregimeisdominatedby springfreshettypeevents,whicharedampenedbythelakestorage.Thehydrologyofbothriver systemsisexaminedinthissection. 4.1 AvailableData ApprovedlongͲtermpeakanddailydischargerecordsupto2011wereobtainedfortheWaterSurvey Canada(WSC)gaugesontheSouthAlouetteRivernearHaneyandtheNorthAlouetteRiverat232nd Street(Figure1).Preliminarydatafrom2011toFebruary2015wasalsocollectedandreviewed. Table3.SummaryofWSChydrometricgauges. Station NumberStationName Gross Drainage Area Periodof Record Hydrometric Measurement Type Operational Schedule 08MH005(SOUTH) ALOUETTE RIVERNEAR HANEY 234km2*  1911–1915 1960–1964 1971–1973 1974–1974 1975–2015 Flow Flow Flow Flow Flow Continuous Continuous Continuous Miscellaneous Continuous 08MH006NORTH ALOUETTE RIVERAT232ND STREETMAPLE RIDGE 37.3km21911–1913 1960–1968 1969–2015 Flow Flow Flow Continuous Continuous Continuous Note: 1. TheSouthAlouetteWatershedincludes24km2betweentheAlouetteDamandtheWSCgauge.  SurveynotesfromtechniciansconductingflowestimatesandmaintenanceonthetwoWSCgaugeswere alsoexamined.Overtheyears,thestationshavebeenvisitedbetweenthreeandsixtimesperyearand thegaugedatumcheckedduringthesevisits.Noanomalieswerenotedandnoadjustmentsweremade  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis13 Phase2–TechnicalInvestigationsCompletion FinalReport totheapprovedrecordprovidedbyWSC.Historicratingcurvesforthegaugeswerealsoanalysedfor anychangesovertime. ContinuouswaterlevelandflowdataforthetwoWSCgaugeswasalsoreviewedfor2011toFebruary 2015.However,thisdataisconsideredtobepreliminaryandisnotyetapprovedbyWSC.Assuch,while thisdatawasreviewedformodelcalibration,itwasnotincludedinthestatisticalfloodfrequency analysis. ThreeothercontinuouswaterlevelgaugeshavealsobeeninstalledontheNorthAlouetteRiver(Figure 1).TheCityofMapleRidgehasinstalledacontinuouswaterlevelgaugeontheNorthAlouetteRiverat 224thStreet.DataisavailablefromFebruary2009tothepresent.Similarly,theAlouetteValley Association(AVA)hasinstalledawaterlevelgaugeatapedestrianbridgeontheNorthAlouettenear 232ndStreet;thistoohascontinuousdataavailablefromFebruary2009onwards.NHCsurveyedbothof thesegaugelocationsonApril16th,2010inordertotiethegaugesintogeodeticdatum.Datumswere confirmedduringfollowupsitevisitsinJanuary2015.Lastly,theCityofPittMeadowsmaintainsawater levelgaugeattheconfluenceoftheNorthandSouthAlouetteRiversandprovideshourlydataonits website. AdditionalSouthAlouetteRiverhydrometricinformationisavailablefromBCHydro,whichmonitors outflowsfromthereservoiratAlouetteLake.BCHydrohasprovidedpartialdamoutflowrecordsfrom 1984,withcompleterecordsfrom2003onwards.BCHydrohasalsoprovidedinformationonestimated inflowstotheAlouettesystemanddiversionflowstoStaveLake. WSCalsomaintainsthewaterlevelgaugePittRiverNearPortCoquitlam(08MH035),locatedatthe downstreamendoftheNorthandSouthAlouetteRiversystem.Thisgaugeisapproximately2km downstreamoftheconfluenceoftheSouthAlouetteRiverandPittRiver.Thiswatergaugeleveldata setextendsfrom1948tothepresent. 4.2 GeneralHydrology 4.2.1 NorthAlouetteRiver TheNorthAlouetteRiverhasatypicalpacificcoastalhydrologicregimewiththelargestflowsoccurring inthewinterasaresultofheavyprecipitation(Figure20).Meanmonthlyflowsvaryfrom0.7m3/sin Augustto4.9m3/sinNovember.Themeanannualdischargeis2.8m3/s.Thesemeanflowsare relativelysmall;howeverpeakflowswellinexcessof80m3/shavebeenobserved(Figure21).Figure21 alsoshowsthatlargefloweventscanoccurinboththesummerandwinter,thoughlargerflowsare morecommonlyseeninthewinter.ThelargestrecordedflowsontheNorthAlouettearepresentedin Table4.   NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis14 Phase2–TechnicalInvestigationsCompletion FinalReport Table4.LargestrecordedfloweventsontheNorthAlouetteRiver(1969–Present). RankInstantaneous Flow(m3/s) Date 12451 March11,2007 2162February24,1986 3157January18,2005 4154November6,2006 5147October16,2003 6140November11,1990 7132November13,1998 8126January4,1984 9124July11,1983 10118December26,1980 Note: 1. WSCestimate.Largeslidethatblockedthechannelatapproximately11.5kmfromthemouthmayhave causedaflowspikewhenwaterbrokethroughtheslidedam.  Acomparisonwasmadebetweentheextremeflowsandextremeprecipitationevents.Althoughthe largefloweventssometimesfollowlargeprecipitationevents,thisisnotalwaysthecase.Thereare otherfactorssuchastemperatureandantecedentconditionsthatplayaroleinthehydrologyofthe mostextremefloweventsontheNorthAlouetteRiver. 4.2.2 SouthAlouetteRiver ThehydrologyoftheSouthAlouetteRiverwithinMapleRidgeisdominatedbythecontrolofthe AlouetteDam;verylittleinformationisavailableregardingitsunregulatedregimepriortothe constructionofthedamin1926.Modificationsmadetothedamin1984havealsoimpactedtheflow regime.Meanannualdischargeafter1984is3.5m3/s.Priortothemodificationsitwas2.5m3/s.The hydrologyinformationforthepostͲmodificationregimeispresentedinthisreport,asitreflectsthe currentdegreeofregulation.SummaryinformationfortheSouthAlouetteWSCgaugeat232ndStreetis presentedinFigure22andFigure23.Peakmeanmonthlyflowsoccurinthewinter,averaging6.7m3/s. LowflowsareobservedinAugust,averaging2.3m3/s.Meanannualdischargeatthegaugeis3.5m3/s. Althoughthelargesteventsoftheyearoftenoccurinthewintermonths(Figure23),somelargeevents occurinthesummer.Theselargesummereventareflushing/pulseflowsreleasedbyBCHydrofor fisheries(BCHydro2009)orlargefreshetreleases,suchasin1997.Table5summarisesthelargest recordedflowsontheSouthAlouettesincedammodification.    NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis15 Phase2–TechnicalInvestigationsCompletion FinalReport Table5.LargestrecordedfloweventsontheSouthAlouetteRiver(1984–Present)1. RankInstantaneous Flow(m3/s) Date 1121March11,2007 281.1January18,2005 376.7November23,1986 475.7November9,1989 564.3November6,2006 650.2January12,1987 747.3October17,2003 845.8December10,2004 941.2March19,1997 1040.5December15,1999 Note: 1. Onlyincludeseventswhichmodelthecurrentregime(eventssinceregulationbydam).  Upstreamofthelake,theAlouetteRiverwatershedisgenerallyuntouchedandinanaturalstate. GeneralhydrologiccharacteristicsarepresentedinFigure24andFigure25.Theregimeisslightly differentfromeithertheNorthAlouetteortheSouthAlouettedownstreamofthedam.Largeflowsare seenbothinthewinterasaresultofrainͲonͲsnoweventsandinthespringduringthefreshet.Flowsare attheirlowestinAugustandSeptember,wheninflowstothelakearearound6m3/s. AlloutletsfromAlouetteLakeareregulatedthroughtwomajorroutes.First,flowsforpowergeneration aredivertedfromthesystemintoStaveLakethroughadiversiontunnel,whichhasamaximum dischargecapacityof56.6m3/s.Second,flowsarereleasedintotheSouthAlouetteRivereitherthrough alowleveloutlet,oroverthespillway(overflowweirandcrestgate).Minimumflowreleasesinto AlouetteRiveraregovernedbythe2009WaterUsePlan,andvarybetween1.52m3/sand2.97m3/s dependingontheelevationoftheLakeandtimeofyear.Inthespring,a7Ͳdaypulsereleaseofatleast9 m3/sisusedtoprovideamigrationcuefortheKokanee.Otherwise,flowisreleasedtotheSouth AlouetteRiverbasedonBCHydrooperationalproceduresthatmaximizestorageforpowerflowswhile maintainingenoughlivestoragetoprovidesomefloodcontrolinthewinter.Floodmitigationprovisions inthe2009WaterUsePlanrequireactiveregulationofthelakestoragewhenthereservoirreaches 122.6melevationinthewintermonths;thefreeoverflowweirisnotactivateduntilthelakereachesan elevationof125.51m. Themaximumflowreleasedfromthedamsince1984was143m3/s(hourlypeak)on29November 1995.Thenexttwolargestreleasesarehalfthisflow(76m3/sin1990and71m3/sin1986).General patternsareshowninFigure22.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis16 Phase2–TechnicalInvestigationsCompletion FinalReport 4.3 HistoricTrends Oneofthedefinedobjectivesoftheinitialstudyweretoexamineanytrendsinhydrologyandclimate. Thereisconcernamongstsomestakeholdersthatflowsandfloodeventshaveincreasedoverthelast coupleofdecades.Trendsinthehydrologicregimeareassessedinthissection. Figure26showsobserveddailyflowsonbothriversfrom1911to2008.Significanteventsareseenon bothriversthroughouttherecord.ThelargesteventsonthegraphoccurontheSouthAlouetteRiverin 1912and1913;thisispriortotheconstructionoftheAlouettedam,whentheriverwasunregulated. 4.3.1 NorthAlouetteRiver AnnualpeakdailyandinstantaneousflowsfortheNorthAlouettearepresentedinFigure27.Although thelargestrecordedeventwasintherecentpast(2007),nostatisticallysignificantpatternsshowa distincttrendofincreasingpeakflows.The2007eventmayhavebeenaresultofalogjamoutburst flowandlikelydoesnotrepresenttrueflowvolumesintheriver. Inadditiontothepeakflowanalysis,thedatawasseparatedintowinterandsummerseriestoreview observabletrendsinpeakseasonalevents(Figure28).Nosignificanttrendsareobserved. Finally,thenumberoflargefloweventsperyearatthegaugewerecalculated,wherealargeflowevent wasconsideredtobe40m3/sormore,whichistheestimatedbankfullflow(NHC1990).Nocleartrends wereobserved(Figure29).However,itshouldbenotedthattheperiodfrom2002to2007hadalarger numberoffloodflowsthantypical. Althoughnocleartrendsaredetectableatthistime,theymaybecomeapparentinthefutureasmore dataiscollected.Areassessmentoftheclimateandhydrologicdatashouldbemadeinadecade. 4.3.2 SouthAlouetteRiver AsnotedinSection4.2,theregimeoftheSouthAlouetteRiverhaschangedasaresultofthe constructionoftheAlouettedamin1926andsubsequentdammodifications.Atrendanalysisusing post1984modificationlakeinflowswascompletedbutshowednosignificantchanges.Themorphology oftheSouthAlouetteRivergenerallyshowsthattheriverchannelisoversizedforthecurrentflow regime,asthechannelconveyedsignificantlyhigherflowspriortoregulation.TheSouthAlouetteRiver isthereforelesspronetoriparianfloodingthantheNorthAlouette. 4.4 FrequencyAnalysisandDesignFlowHydrographs 4.4.1 NorthAlouetteRiver Todeterminedesignflowsforfloodplainmapping,afrequencyanalysisofavailableNorthAlouetteflow datawascompleted.Peakannualflows(bothdailyandinstantaneous)wereusedtoestimateflowsfor variousreturnperiods.Inbothcases,aLognormaldistributionwasdeterminedtobethebestfittothe availabledatapoints.Maximumannualdailyflowdatawasanalysedfortheyears1960to2011.Peak  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis17 Phase2–TechnicalInvestigationsCompletion FinalReport annualinstantaneousflowdatawasanalysedfortheperiodfrom1969to2011.Flowsforvariousreturn periodsarepresentedinTable6. Table6.SummaryofannualflowfrequencyanalysisfortheNorthAlouetteRiverat232ndStreet. ReturnPeriod (years) DailyFlow (m3/s) Instantaneous Flow(m3/s) 24278 560115 1071141 2581174 5098201 100110228 200122256  The1990BCEnvironmentreportusedforthepreviousAlouettefloodplainmappingincludeda200Ͳyear peakdailyflowof140m3/sandapeakinstantaneousflowof300m3/s,values15%and17%higherthan thepresentanalysis,respectively.Thisisduetotheincreasedperiodofrecord,whichisdoublethe recordthatwasavailablein1990. ThevaluesfromthefrequencyanalysiswereusedtocreatedesigninflowhydrographsfortheMaple Ridgefloodplainmapping(Figure30).Thesedynamichydrographsincorporatea48hourfloodingevent, withapeakinstantaneousflowincorporatinga10%increasetoallowforclimatechangeprojectionsto year2100asrecommendedbyAPEGBC(2012).Thecentral24hourperiodoftheeventalsohasan averagedailyflowequaltothecorrespondingpeakdailyflowwitha10%climatechangeincrease(Table 7). Table7.NorthAlouettedesigndischargehydrographswithclimatechangeimpacts. ReturnPeriod (years) DailyFlow (m3/s) Instantaneous Flow(m3/s) 24686 566127 1078155 2589180 50108221 100121251 200134282   NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis18 Phase2–TechnicalInvestigationsCompletion FinalReport Usingthedesignhydrographswithaclimatechangeallowance,200Ͳyeardailyandpeakinstantaneous flowvaluesarewithin6%oftheprevious1990study.Forreference,the200Ͳyeardesignflowis15% largerthanthehistoricalmaximumflowof245m3/sexperiencedin2007. 4.4.2 SouthAlouetteRiver AsimplefloodfrequencyanalysiswasnotpossibleforSouthAlouetteRiver,astheriverisregulatedand floodflowscouldnotbedirectlybasedonthegaugerecords.Forthepurposesofthisprojectandfuture planning,itassumedthatthedamremainsinplaceandoperationalconditionsinthe2009BCHydro WaterUsePlanremainineffect. DesigninflowsintoAlouetteLakewereestablishedusingrecordsprovidedbyBCHydro,datingfrom 1984.Theseincludeobservedreleasesfromthedam,lakeelevationsandcalculatedinflowstoAlouette Lake.Afrequencyanalysisofpeakannualdailyinflowstothelakewascarriedoutandresultsare presentedinTable8;noinstantaneousdatawasavailable.However,BCHydroreportsthetopfour hourlypeakeventsintheirFloodSIMMreport.Theseare781m3/sinMarch2007,759m3/sinOctober 2003,710m3/sinNovember1995and703m3/sinNovember1990.Peakhourlyflowsaresignificantly largerthanpeakdailyflows,withinstantaneous/daily(I/D)ratiosrangingfrom1.7to2.3andaveraging 1.9forthesefourevents. Table8.SummaryoffrequencyanalysisfortheSouthAlouetteRiveraboveAlouetteLake. ReturnPeriod (years) DailyFlow (m3/s) 2275 5357 10401 25448 50479 100507 200533  TocalculateoutflowfromthelakeandintotheSouthAlouettedownstream,NHCdevelopedaSTELLA flowroutingmodel,whereinflowhydrographsbasedonthepeakdailyflow(Table8)wererouted throughtheLakeandouttheoverflowweir.Severalassumptionsandsimplificationsweremadeto completethisanalysis;thesewerebasedonBCHydro’soperationalguidelinesforthedam: ƒDynamichydrographsweredevelopedassuminga48Ͳhourstormeventwithatriangular shape,wherethemiddle24hourshadadailyflowequaltothatpresentedinTable8;peak instantaneousflowis1.3timesthedailyflow.Baseflowswereassumedtobe10%ofthe peakdailyflow.Theshapeandlengthofthestormweredevelopedbasedonobserving historicrecordsandfindingacommonrepresentativestormshape.Alternatestormlengths andshapesweretestedaspartofasensitivityexercise.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis19 Phase2–TechnicalInvestigationsCompletion FinalReport ƒThelakeelevationwasassumedtobeattheMaximumNormalOperatingLevelof125.51m elevation.Thisisaconservativeassumption,asthelakewouldbeactivelyoperated(i.e. flowswouldbereleasedslowly),oncethelakehasreachedanelevationof122.6m. ƒThefreecrestweirwasassumedtobefullyoperational,withnoflowbeingdivertedtothe crestgate.Outflowfromthelowleveloutletgatewasassumedtobenegligible. ƒTheStavediversionsystemwasassumedtobenonͲoperational;allflowwasroutedintothe SouthAlouetteRiver.Thisisaconservativeassumption,astheStavediversionsystemhasan actualmaximumcapacityof56.6m3/s. OutflowsfromthedamintotheSouthAlouetteRiverwerecalculatedbyroutinginflowsthrough AlouetteLake.DesignoutflowsaresummarisedinTable9andFigure32. Table9.SummaryofAlouetteLakeinflowsanddesigndischargeoutflowstotheSouthAlouetteRiver. Return Period (years) Peak Daily Inflow (m3/s) Peak Instantaneous Inflow(m3/s) PeakDaily Discharge (m3/s) Peak Instantaneous Discharge(m3/s) 2275359200227 5357466276315 10401523314362 25448584362412 50479625389444 100507661415473 200533695440500  AlouetteLakesignificantlyattenuatesthereservoirinflows,evenwhenconservativeassumptionsare usedintermsofoutflowscenarios.Thepeakinstantaneousflowof500m3/siscomparabletothe 558m3/susedinthe1990MOEstudy.Thedammodificationsin1984accountforthedecreaseinthe expectedflow.Noextraallowancewasmadeforclimatechange,asthesystemiscontrolledbythe AlouetteDamanditisassumedthatcompensationinoperatingprocedureswillbemadebyBCHydro. ThisassumptionshouldbeconfirmedwithBCHydrointhefuture. Somesensitivitytestswereperformedonthesynthesizedstormlengthandstormshapes.Thesensitivity ofthesynthesizedflowtostormlengthwastestedusingtheSTELLAModel.Both72Ͳhourand120Ͳhour storms,withtheidenticalpeakdailyflowasthe48Ͳhourstormwereroutedthroughthelake(Figure33). Theassumedlengthofthestormhasanimpactonthepeakoutflow,andconsequentlyonthetotal volumeofflowdischargedintotheSouthAlouettesystem.Thechangeismoremarkedforthefrequent events,witha15.9%increaseinpeakflowsforthe2Ͳyearevent,whena120Ͳhourstormisconsidered ratherthana48Ͳhourstorm.Forthe200Ͳyeareventthereisonlya4.8%increaseinflows.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis20 Phase2–TechnicalInvestigationsCompletion FinalReport ThesensitivityofthesynthesizedflowtostormshapewastestedusingtheSTELLAModel.A48hour stormwithapeakflowequalto1.9timesthedailyflowwasdeveloped.The1.9Qi/Qd(peak instantaneousflowtodailyflowratio)wasassumedbasedontheaveragecalculatedratiovalueforthe fourextremeeventsintheupperSouthAlouetteforwhichbothdailyandhourlyinflowestimatesare available.Thestormproducesthesamevolumeofwaterasthebasetriangular48Ͳhourevent;a comparisonispresentedinFigure33.Theassumedshapeofthestormhasasmallimpactonthepeak outflow.Thechangeismoremarkedforthelargestevents,witha4.6%increaseinpeakflowsforthe 200Ͳyearevent,whenapeakystormisconsideredratherthanatriangularstorm.Forthe2Ͳyearevent thereisa2.2%decreaseinpeakflows.Thechangeinstormvolume(i.e.totalflowoutofthelakeovera 10Ͳdayperiod)isalmostunchangedforallevents. 4.4.3 TributaryInflows InflowhydrographsformajorNorthandSouthAlouettetributariesidentifiedinPhase1ofthisproject aresummarizedinTable10.Thesewerecalculatedbasedonthedesigndischargehydrographsforthe NorthAlouetteRiver(Table7),asthetributarywatershedcharacteristics(size,elevation,aspect)were consideredtobesimilartotheNorthAlouettesystem(Figure10).Asimpleareawatershedtransferwas usedtogeneratescaledhydrographsandisbasedonthewatershedareaspresentedinTable11. HypsometriccurvesforeachofthetributariesarepresentedinFigure34forcomparison. Table10.Tributarydesignhydrographpeakinstantaneousdischarges. Return Period (years) BlaneyCreek Peak Instantaneous Flow(m3/s) FentonRoad Peak Instantaneous Flow(m3/s) McKenny CreekPeak Instantaneous Flow(m3/s) Additional1 NorthAlouette Peak Instantaneous Flow(m3/s) Additional2 South AlouettePeak Instantaneous Flow(m3/s) 26415141443 59422212064 1011527252578 2513332292991 50164393635112 100186444140127 200209504645142 Notes: 1. FlowscontributedbytheNorthAlouettewatershedareadownstreamoftheNorthAlouetteWSCGauge. 2. FlowscontributedbytheSouthAlouettewatershedareadownstreamoftheSouthAlouetteWSCGauge.    NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis21 Phase2–TechnicalInvestigationsCompletion FinalReport Table11.Summaryoftributarywatershedareasandelevations. Location Watershed Area (km2) Mean Elevation (m) NorthAlouetteWSC(08MH006)37.3448 BlaneyCreek26.8216 FentonRoad5.413 McKennyCreek5.017 ConfluenceofNorthandSouthAlouetteRivers42.1Ͳ SouthAlouetteWSC(08MH005)234.0568 ConfluenceofAlouetteRiverandPittRiver251.5Ͳ   Additional1NorthAlouetteTributaryArea4.8Ͳ Additional2SouthAlouetteTributaryArea17.5Ͳ Notes: 1. NorthAlouettetributarywatershedareadownstreamoftheNorthAlouetteWSCGauge. 2. SouthAlouettetributarywatershedareadownstreamoftheSouthAlouetteWSCGauge.   4.4.4 CoordinationofHydrographs Forthepurposesoffloodplainmappingandmodeldesignruns,itisassumedthatthefloweventpeaks simultaneouslyinallunregulatedwatersheds.InflowhydrographspeaksimultaneouslyontheNorth AlouetteRiver,thefivesmallertributarywatershedsandtheSouthAlouetteRiverupstreamofthe AlouetteReservoir.DuetotheroutingthattakesplacethroughtheAlouetteReservoir,thereisa 7.5hourdelaybetweenthepeakingoftheNorthAlouetteRiverandthepeakingoftheSouthAlouette Riverdownstreamofthereservoir.Actualcombinationsmayvarybutthisassumptionisconsidered representativeofactualconditionsandsomewhatconservative. 4.5 DataLimitations Allhydrometricinformationsuffersfrominherentlimitations;theseareparticularlyrelevantinahighly dynamicsystemsuchastheNorthAlouetteRiver.Throughoutthecourseofthehydrologicand hydraulicmodellinginvestigations,NHCidentifiedpossiblefailingsinthepublishedflowdataforthe NorthAlouettegauge.Theseincludegeneralerrorsassociatedwithhighflowestimatesfromrating curves,anderrorsinlowerandmediumflowsresultingfrommorphodynamicchangestotheriverinthe vicinityofthegauge. Publishedflowsformostgaugesarecalculatedfromobservedwaterlevelsandanassumedratingcurve. Ratingcurvesaredevelopedbasedonriversurveyswhereboththewaterlevelandtotalflowacrossa sectionaremeasured.Themajorityofthesemeasurementsaretakenwhentheflowsareloworat mediumflowevents;itisraretocaptureahighflowevent.Thus,curvesareextrapolatedwellbeyond thehighestmeasuredflowͲwaterlevelpairandthereisagreatdealofuncertaintyinthecurveathigh  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis22 Phase2–TechnicalInvestigationsCompletion FinalReport waterlevelsandflows.Forexample,thehighestmeasuredflowattheNorthAlouettegaugewas 41.3m3/sinJanuary1966.However,WSChasreportedflowsashighas245m3/sbasedonan extrapolatedcurve. Theuncertaintyinthehighflowestimatesisfurtherincreasedbycompletingaregionalhydrologic analysis.Nearbygaugedwatershedsthathavesimilarcharacteristics(medianelevation,size,aspect, nonͲregulated,morethan15yearsofrecord)totheNorthAlouetteRiverwereexamined.Acomparison ofmaximuminstantaneousflowsperareaarepresentedinTable12.TheflowͲarearatiosfortheNorth AlouetteRiveraresignificantlyhigherthanforothernearbygauges. Table12.Summaryofflowsbyareafornearbygauges. Return Period (years) NorthAlouette (08MH006) Instantaneous PeakFlow/Area (m3/s/km2) KanakaCreek (08MH076) Instantaneous PeakFlow/Area (m3/s/km2) JacobsCreek (08MH108) Instantaneous PeakFlow/Area (m3/s/km2) 22.11.31.5 53.12.01.8 103.72.52.0 254.53.12.1 505.13.92.2 1005.74.72.2 2006.25.5N/C  Atlowerwaterlevelsthereremainsuncertaintyinthepublishedflows;primarilybecausetheNorth AlouetteRiverisadynamicsystemandthechannelinthevicinityofthegaugechangesfrequently(see Section2).Inanattempttodealwiththerapidlychangingchannel,WSCupdatestheratingcurvesfor theNorthAlouettegaugeregularly;ithasbeenupdatedsixtimessince2007.Overthisperiod,forthe samewaterlevel,reportedflowsvarybyasmuchas20%. Giventheabove,itisimportanttoconsiderlimitationsofthehydrologicanalysesandsubsequent hydraulicmodellingwhenlookingatprojectresults. AfurtherlimitationtothehighflowdataontheNorthAlouetteRiveristheknownhistoryofoutburst floodsresultingfromthesuddenreleaseofalogjam;thisisawellͲknownprocessinthePacific Northwest.Forexample,alargelogjamwasobservedintheupperwatershedinMarch2007.Thereis reasontobelievethatanoutburstfloodthroughthisjamwasthecauseofthefloodingintheAlouette Valleyon11March2007.Unfortunately,theWSCgaugeontheNorthAlouettethatmighthave recordedthistypeofpeakyfloweventwasnotfunctioning;thereportedhydrographwasestimatedby WSC.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis23 Phase2–TechnicalInvestigationsCompletion FinalReport 5 COLLECTIONOFCALIBRATIONANDVALIDATIONDATA InOctober2014,NHCinitiatedaprogramforthecollectionofhydraulicmodelcalibrationdataalongthe NorthAlouetteRiver.Thisprogramwasinstatedduetothelimitedpeakflowdataandfloodingextent informationavailableforlargeevents.Duringthedurationoftheprogram,NHCmonitoredpeakflows sothatfieldcrewscouldbequicklymobilizedduringhighfloodstomeasureflows,markhighwater levelsandnotefloodedareas.ThisprogramwasundertakenbetweenOctober2014andFebruary2015. Datawascollectedforfloweventson3November2014and23January2015andusedforcalibration andverification,respectively. 5.1 November2014FloodEvent Onthenightof03November2014,NHCstaffmembersmeasuredflowsontheNorthAlouetteRiver approximately100mdownstreamoftheWSC08MH006gauge(Figure1).Highflowmeasurements weretaken,however,theactualpeakwasnotcaptured.Thestaffalsocollectedseveralwaterlevel measurementsatthemajorNorthAlouetteRiverBridgesat132ndAvenue,224thStreetand232ndStreet. Lastly,highwaterlevelsandfloodextentsweremarkedalong132ndAvenue,224thStreetand136th Avenue.ThisinformationwasgeoreferencedandincorporatedintotoprojectGISdata. ArequestforfloodinformationandphotographswasmadetotheAlouetteValleyAssociation(AVA), whichprovidedacompiledreportoflocalresidents’commentsandobservations.Residentresponses werecollectedfrom132ndAvenue,136thAvenueand224thStreet.Floodwatersurfacelevels,extents anddebrisinformationprovidedbytheAVAwasalsogeoreferencedandincorporatedintoprojectGIS data. 5.1.1 ReviewofNovember2014Data InadditiontotheinformationcollectedbyNHConsite,dataontheNovember2014floodeventwas collectedfromallavailablegaugesapplicabletotheprojectstudyarea.Thedatacollectedincluded: ƒMapleRidgeGaugeat224thStreet–WaterSurfaceElevationData(5minInterval) ƒAVAGaugeatthepedestrianbridgeͲWaterSurfaceElevationData(5minInterval) ƒPittMeadowsGaugeatAlouetteConfluenceͲWaterSurfaceElevationData(1hrInterval) ƒSouthAlouetteWSC(08MH005)–PreliminaryWaterSurfaceElevationData(5minInterval) ƒSouthAlouetteWSC(08MH005)–PreliminaryFlowData(5minInterval) ƒPittRiverWSC(08MH035)–PreliminaryWaterSurfaceElevationData(5minInterval) Unfortunately,itwasnotpossibletousedatafromtheNorthAlouetteWSCgauge(08MH006).There havebeenseveralmajorbedformchangesatthislocationsincethelastWSCstageratingcurvewas  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis24 Phase2–TechnicalInvestigationsCompletion FinalReport developed.WSChasalsoreporteddifficultieswiththeexistingwaterlevelgauge,whichiscurrently undertakingrepairs/recalibration. TheonlysourcesofcontinuousgaugedataalongtheNorthAlouetteRiverduringtheNovember2014 eventcamefromthetwowaterlevelgaugesat224thStreet(propertyoftheCityofMapleRidge)and thepedestrianbridgedownstreamof232ndStreet(propertyoftheAVA). 5.1.2 November2014NorthAlouetteHydrograph TodeterminetheNovember2014eventNorthAlouetteinflowhydrograph,NHCdevelopedstageͲ dischargeratingcurvesforboththeMapleRidgeandAVAgauges.Theseratingcurvesweredeveloped inAquariusTimeͲSeriessoftwarebyAquaticInformaticsandareshowninFigures35and36.Usingthese ratingcurves,thepeakinstantaneousflowfortheNorthAlouetteNovember2014eventisestimatedto be69m3/s.Maximumflowwasreachedatapproximately1:30AMon04November2014.The hydrographfromtheAVAgaugewasselectedformodellinguse,asitisfurthestupstreamandlessofa dampingeffectisobservedonthepeak(Figure37).Theeventhasanestimatedreturnperiodofless thantwoyears. 5.2 January2015Event Asmallereventtookplacefrom23to26January2015andwasrecordedformodelvalidation.NHCstaff measuredapeakflowof59m3/sattheNorthAlouetteRiver232ndStreetBridgeaswellashighwater marksatmultiplepointsalongtheriver.Thisinformationwasgeoreferencedandincorporatedintoto projectGISdata.Floodextentsdatawasnotcollectedbystaff,asthiseventwasconsideredtoosmall. 5.2.1 ReviewofJanuary2015Data InadditiontotheinformationcollectedbyNHConsite,datafortheJanuary2015eventwasalso collectedfromallavailablegaugesapplicabletotheprojectstudyarea.Thedatacollectedincluded: ƒMapleRidgeGaugeat224thStreet–WaterSurfaceElevationData(5minInterval) ƒAVAGaugeatthepedestrianbridgeͲWaterSurfaceElevationData(5minInterval) ƒPittMeadowsGaugeatAlouetteConfluenceͲWaterSurfaceElevationData(1hrInterval) ƒSouthAlouetteWSC(08MH005)–PreliminaryWaterSurfaceElevationData(5minInterval) ƒSouthAlouetteWSC(08MH005)–PreliminaryFlowData(5minInterval) ƒPittRiverWSC(08MH035)–PreliminaryWaterSurfaceElevationData(5minInterval) AsinNovember,itwasnotpossibletousedatafromtheNorthAlouetteWSCgauge(08MH006)asthe gaugewasnotrecording.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis25 Phase2–TechnicalInvestigationsCompletion FinalReport 5.2.2 January2015NorthAlouetteHydrograph AswiththeNovemberevent,theNorthAlouetteJanuary2015inflowhydrographwasdeterminedusing theNHCstageͲdischargeratingcurvesfortheMapleRidgeandAVAgauges(Figure38).AstheAVA gaugeshowedthebestagreementwithonsitemeasurementscompletedbyNHC,theAVAhydrograph wasselectedformodellinguse.Maximumflowwasreachedatapproximately7:30PMon23January 2015. 6SURVEYOFCHANNELCROSSSECTIONS In1981,theBCMinistryofEnvironmentsurveyedatotalof68sectionsoftheAlouetteRiversto producetheoriginalfloodplainmapping.ThesectionswerenotgeoͲregisteredandarenowoutͲofͲdate, consideringthechannelchangesthathavetakenplaceovertime.TheBCHydrosurveyincludedatotal of109crossͲsections.Inadditiontoprovidingonlyfairlyschematicoutlinesofthechannels,thesections arealsowidelyspaced.ThesecrossͲsectionswereusedintheinitialPhase2modellingcompletedin 2011. FollowingthisinitialPhase2modelling,itwasagreedthatmoredetailedrivercrossͲsectionsurveywas requiredtoproducedetailedhydraulicmodelresults.NHCresurveyedtheNorthandSouthAlouette riverchannelsinmoredetailandatareducedspacingin2014.Thissurveyfocusedonthepreviously definedprojectarea(roughly5kmlongreachesofbothrivers)andwascarefullylaidouttocapture constrictedchannellocationsthathavethegreatestimpactonwatersurfaceprofiles.Thisinformation wascombinedwithprevioussurveyscarriedoutbyNHCin2010andincorporatedintothehydraulic model.Atotalof77newsurveyedcrosssections(Figure39)wereaddedtothemodel.Spotsurveydata collectedattheriverbridgeswasalsoincorporated. 7 HYDRAULICMODELLING Asacomponentofthisproject,acomprehensivehydraulicmodelwasdevelopedofthetwoAlouette RiversandMapleRidgefloodplainusingDHIMIKEhydrodynamicsoftware.A1Dmodelissuitablefor simulatingdischarges,waterlevelsandotherhydraulicparameterswhileflowsremainwithintheriver banks.Forthisproject,1DinͲbankrivermodellingwascompletedusingMIKE11.However,itisdifficult torealisticallysimulatecomplexoverbankfloodingandbankbreachinginoneͲdimensionalmodelling. Instead,thesefloodplainprocessesweremodelledwithamoreaccuratetwoͲdimensionalmodelusing MIKE21FM(FlexibleMesh)software.Thetwomodelswerethenconnectedusingtheoverarching MIKEFLOODsoftware. ThischapteroutlinesthegeneralmethodologyusedtodeveloptheMIKE11,MIKE21andMIKEFlood models.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis26 Phase2–TechnicalInvestigationsCompletion FinalReport 7.1 DEMDevelopment TheCityofMapleRidgesuppliedanupdatedDEMdatasetin2014whichcoverstheentirestudyarea.It wassuppliedtoNHCasa2mresolutiongrid.TheDEMdoesnotincludeinͲchannelbathymetricdata; bathymetrywasderiveddirectlyfromcrossͲsectionsurveys.TheDEMwasusedtoguidedevelopmentof thestreamnetwork,banklinesandcrossͲsections,aswellasthedikesandhighlandthatdefinethe boundarybetweentheMIKE11andMIKE21modelareas.ElevationdatawasextractedfromtheDEM viacrossͲsectionsforinputtotheMIKE11model,andtheDEMsurfacewasresampledbasedonthe modelmeshforinputtotheMIKE21model.ProcessingwasdoneusingESRIArcGIS10.1software, includingthe3DAnalystandSpatialAnalystextensions. 7.2 MIKE11 TheMIKE11modelcoverstheinͲchannelsectionsoftheNorthandSouthAlouetteRiversfromtheir headwaterstotheconfluencewiththePittRiver(Figure39).SomeofthekeyinputsfortheMIKE11 modelweredevelopedusingArcGIS.Theseincludethestreamnetwork,crossͲsectionsandwatershed areas. StreamcentrelinesfortheNorthandSouthAlouetteRiversweredigitizedbasedonBC1:20,000scale CorporateWatershedBase(CWB)streamdata.FeaturesweremodifiedwithreferencetotheDEM, surveyandrecentorthophotography.VerticeswereaddedtorepresentkeyfeaturessuchascrossͲ sectionlocations,bridgesandtributaryconfluencepoints.Thestreamfeatureswerecalibratedto determineriverchainage.ThestreamnetworkshapefilewasinputdirectlytoMIKE11asthebasisfor theMIKE11geometryfile. CrossͲsectionlinesweredrawnbasedonthelocationsofthe2010and2014surveys.AdditionalcrossͲ sectionlineswereaddedasrequiredatbridgelocationsandcrossͲsectionelevationvalueswere extractedfromaninterpolatedsurfacegeneratedinGIS.Leftandrightbanklinesweredigitizedbased ontheDEMandorthophotos,andwereused,alongwiththestreamcentreline,totagcrossͲsectiondata pointsasleftbank,rightbankorthalweg.CrossͲsectionelevationsandtagswereextractedfroma combinationoftheDEM(foroverbankareas)andthebathymetricsurveydata,usingcustomGIStools developedbyNHC.ThecrossͲsectionlinelocationandelevationpointdatawereexportedfromtheGIS toMIKE11. PreparationofmodeldataintheGISwasaniterativeprocess.Aspreliminarymodellingresults highlightedareasthatrequiredrefinement,revisionsweremadeintheGISanddatawasreͲexportedfor themodel. Mainstemandtributarywatershedareasarerequiredasinputstothemodel.Theseweredeterminedin theGISusingBCCorporateWatershedBase(CWB)streamandwatershedboundarydataasabase. AdditionaldatawasusedasreferencewhendevelopingtheGISdatalayersforthemodel.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis27 Phase2–TechnicalInvestigationsCompletion FinalReport ƒDikecrestmappingwasobtainedfromtheBConlineLandandResourceDataWarehouse (LRDW). ƒTheCityprovided25cmresolutionorthophotosofthestudyareatakeninApril2009;these weresupplementedbyrecentorthophotosfromGoogleMaps. 7.2.1 Network AsinglemodelnetworkthatincludesboththeNorthandSouthAlouetteRiverswasdeveloped(Figure 39).ThenetworkwasdesignedusingcommonNorthAmericanpractice,wherethechainageincreases movingupstream.Therefore,thenetworksandassociatedstructuresaresetuptorunwithnegative flow. Thenetworkincludestwobranches: 1.NorthAlouetteRiver–fromthekm13.0inUBCresearchforesttotheconfluencewith theSouthAlouetteRiver. 2. SouthAlouetteRiver–fromkm19.6attheAlouetteDamtotheconfluencewiththePitt River. 7.2.2 CrossSections ThecrossͲsectionfilewascreatedbyupdatingthe2008crosssectionfilewithcrosssectionsimported directlyfromtheGISDEMusinginͲhousetools;interpolatedsectionswereaddedasnecessary.Atotal of327sectionsareusedtodescribetheNorthAlouetteRiver,and478sectionsmakeuptheSouth AlouetteRiver.Thetotalnumberofcrosssectionsusedtodescribeeachriverinthemodelgreatly exceedsthenumberofsurveyedcrosssectionsduetointerpolationbetweensurveyedsections. Interpolatedcrosssectionswereaddedtothemodeltoincreasemodelstabilitybyallowingfora smoothtransitionfromonebedformtothenext. WheretheMIKE11modelisboundbytheMIKE21model,crossͲsectionsextents(markers1and3)were locatedathighpointsasnotedintheGISanalysis.Someadjustmentstothemarkerlocationsand elevationsweremadeoncetheMIKE11andMIKE21modelswerelinkedinMIKEFlood;theelevationsof thetwomodelsshouldmatchascloselyaspossible. Allsectionsaremodelledusingaresistanceradius;thismethodisapplicabletotherelativelysmall channelsectionsfoundontheAlouetteRivers.Allsectionsaregeoreferencedandarethereforeeasily viewedintheMIKE11Network.Relative,transversalroughnesswasappliedtoallsections. Markerpointsforthelowflowboundarieswereplacedfromacombinationoftheorthophotosand normalwaterleveledgesnotedonavailablemappingandfromvisualinspectionofthesectionshape. Roughnessvaluesweredeterminedbasedonorthophotography,siteobservationandliteraturevalues.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis28 Phase2–TechnicalInvestigationsCompletion FinalReport 7.2.3 HydraulicStructures Bridgestructureswereincludedinthenetworkfile.Atotalof7bridgeswereincludedasshowninTable 13.Allmajorroadcrossingswereincludedinthemodel,aswellasoneprivatecrossingontheNorth AlouetteRiver,whichhasasignificantpierinthemainchannel. BridgesweremodelledusingeitherbasicenergyequationsortheFederalHighwayAdministration (FHWA)WSPROmethod,dependingonwhetherornotthebridgesareskewedfromthedirectionof flow.Allbridgeswereassumedtobepronetosubmergenceandoverflow.Basicgeometricparameters, includingbridgewidthandskewforeachofthebridgeswerederivedfromavailableinformationas describedinthePhase1reporting.TheNorthAlouetteRiverbridgeat232ndStreetisanexception,asit wasreplacedin2014.AsͲbuiltdimensionsforthisbridgewereprovidedbytheCity. Table13.Summaryofbridgecrossings. BridgeChainage(m)Comments NORTHALOUETTE 224thStreetBridge8315Geometryfrom1981MOEStudyandLiDAR 132ndAvenue8770BridgeasͲbuiltinformationfrom1997 232ndStreet10240BridgeasͲbuiltinformationfrom2014 PrivateAccess10408Significantstructurewithlargeconcretepierinchannel SOUTHALOUETTE 216thStreetBridge8772Geometryfrom1981MOEStudy 224thStreetBridge10720BridgeasͲbuiltinformationfrom1981 232ndStreet12610BridgeasͲbuiltinformationfrom2006  Itshouldbenotedthattwoadditionalprivatecrossingsbetween132ndAvenueand232ndStreetonthe NorthAlouetteRiverwerenotmodelled;thesearesinglespannarrowstructuresthatwouldnotimpact thehydraulicssignificantly.Theymayhoweveraccumulatedebrisduringafloodeventwhichwould resultinlocalizedhydraulicimpacts;thesetypesofimpactswerenotmodelleddirectly. 7.2.4 ModelInflowsandWaterLevelBoundaries Atotalof8boundariesareusedintheMIKE11model:twoopeninflowboundaries,fivepointsource inflowboundariesandoneopenwaterlevelboundary.Theopeninflowboundariesarelocatedatthe upstreammostlimitsoftheNorthandSouthAlouetteRivers.Pointsourceinflowboundariesareusedto addflowtothesystemattheconfluenceofmajortributariestotheAlouetteRivers.Thelocationofthe boundariesisdescribedinmoredetailinTable14.Thereisonlyonedownstreamwaterlevelboundary, whichislocatedattheconfluenceoftheSouthAlouetteRiverwiththePittRiver.   NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis29 Phase2–TechnicalInvestigationsCompletion FinalReport Table14.SummaryofMIKE11modelboundaries. BoundaryTypeBranchChainageComments OpenInflowNorthAlouette12773PrimaryinflowtoNorthAlouette OpenInflowSouthAlouette19025PrimaryinflowtoSouthAlouette PointSourceInflowNorthAlouette2192BlaneyCreek PointSourceInflowNorthAlouette136LocalinflowsdirecttoNorthAlouette PointSourceInflowSouthAlouette7907McKennyCreek PointSourceInflowSouthAlouette3078FentonSlough PointSourceInflowSouthAlouette8000LocalinflowsdirecttoSouthAlouette OpenWaterLevelSouthAlouette0DownstreamboundaryatPittRiver  7.2.5 MIKE11ModelCalibration Modelcalibrationformsanimportantstepinhydraulicmodeldevelopment.Inthecaseofthe1D MIKE11model,itinvolvesthefinetuningofinitiallyselectedchannelManning’sroughnesscoefficients andtheenergylosscoefficientsassociatedwiththevarioushydraulicstructuresalongtherivers. CoefficientswereadjustedtomatchresultstotheNovember2014floodeventdescribedinSection5.1. TheNovember2014wassimulatedfromNovember3rdto5th,withpeakflowsoccurringat1:30AMon the4th.TheNorthandSouthAlouetteRiversweresettotheAVAGaugeNorthAlouetteNovember 2014hydrographandtheSouthAlouetteWSC(08MH005)hydrograph,respectively.Thepointsource tributaryinflowsweresetasscaledhydrographsoftheNorthAlouette.Last,thedownstreamwater levelboundaryatPittRiverwassetusingatimeseriesfromthePittRiverWSC(08MH035)gauge.A summaryofmodelcalibrationboundaryflowinputsisshowninFigure40anddownstreamwaterlevel inputsinFigure41.FurtherdetailsontheseinputsareavailableinSection5above. AcomparisonofmodelledtoobservedwaterlevelsarepresentedFigures42toFigure46.Themodelled waterlevelsonboththeSouthandNorthAlouetteRiversmatchrelativelywellwiththeobservedwater levels.Agreementbetweenmaximumobservedandmodelledpeakriverwaterlevelsissummarizedin Table15.       NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis30 Phase2–TechnicalInvestigationsCompletion FinalReport Table15.MIKE11calibrationpeakriverwaterlevelagreement. GaugeNameRiver MIKE11 Chainage (m) PeakWLs(mGSC) ObservedModelledDifference 232ndStreetHWMNorthAlouette1026514.6814.570.11 AVAGaugeNorthAlouette993712.7612.710.05 MapleRidgeGaugeNorthAlouette83407.077.180.11 PittMeadowsGaugeAlouetteConfluence311.841.820.02 SouthAlouetteWSCSouthAlouette1897312.4712.520.05  Agreementisverygoodthroughoutthestudyarea.AgreementattheMapleRidgegaugeatpeakflows isapproximately11cm;thisisdueinparttothepresenceofasmalldepressionandditchsystemalong theedgeofthebridgewhichconnectstothe224thStreetditchsystem.Thesefeatureswereconsidered tobepartofthelocalminorstormwatersystemandwerenotincludedinthislargescalefloodmodel. MorevariationisalsoseenatthePittMeadowsgaugelocatedattheconfluenceoftheNorthandSouth AlouetteRivers,whichseesthreetidalpeaksduringthedurationofthefloodingevent. Theroughnessvaluesrequiredtobestmatchthemodelresultstothecalibrationeventarewellwithin normallimits.ThefinalroughnessvaluesusedintheMIKE11modelareshowninTable16. Table16.SummaryofMIKE11roughnessvalues. RiverDownstream Chainage Upstream Chainage Resistance (Manning’sRoughness) NorthAlouette3282070.035 NorthAlouette820789560.045 NorthAlouette89561277730.050 SouthAlouette678990.030 SouthAlouette7899130000.035 SouthAlouette13000189730.040  7.2.6 MIKE11ModelValidation Modelvalidationallowsforasecondaryproofofthecompletedcalibration.TheJanuary2015eventwas simulatedfromJanuary23rdto25thandreachpeakflowsatapproximately7:30PMonthe23rd. TheNorthandSouthAlouetteRiversweresettotheAVAGaugeNorthAlouetteJanuary2015 hydrographandtheSouthAlouetteWSC(08MH005)hydrograph,respectively.Thepointsource tributaryinflowsweresetasscaledhydrographsoftheNorthAlouette.Lastly,thedownstreamwater levelboundaryatthePittRiverwassetusingatimeseriesfromthePittRiverWSC(08MH035)gauge.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis31 Phase2–TechnicalInvestigationsCompletion FinalReport AsummaryofmodelvalidationboundaryflowinputsisshowninFigure47anddownstreamwaterlevel inputsinFigure48.FurtherdetailsontheseinputsareavailableinSection5. AcomparisonofmodelledtoobservedwaterlevelsarepresentedFigures49toFigure53.Themodelled waterlevelsonboththeSouthandNorthAlouetteRiversmatchrelativelywellwiththeobservedwater levels.Agreementbetweenmaximumobservedandmodelledpeakriverwaterlevelsissummarizedin Table17. Table17.MIKE11validationpeakriverwaterlevelagreement. GaugeNameRiver MIKE11 Chainage (m) PeakWLs(mGSC) ObservedModelledDifference 232ndStreetHWMNorthAlouette1026514.5014.420.08 AVAGaugeNorthAlouette993712.5912.580.01 MapleRidgeGaugeNorthAlouette83407.007.060.06 PittMeadowsGaugeAlouetteConfluence311.811.700.11 SouthAlouetteWSCSouthAlouette1897312.6612.570.09  Agreementisverygoodthroughoutthestudyarea,validatingtheNovember2014calibration. 7.3 MIKE21 AtwoͲdimensionalhydraulicmodel,MIKE21,wasusedtosimulateoverlandflowandtodetermineflood depthsonthefloodplain.Thefollowingsectionprovidesinformationonthegeneralassumptions,setͲ upandapplicationoftheMIKE21model. 7.3.1 ModelDevelopment AswiththeMIKE11model,GISwasusedtodevelopsomeofthekeyinputstotheMIKE21model.These includedtheDEMdescribedabove,thedefinitionoftheboundarybetweentheMIKE11andMIKE21 modelsandsurfaceroughnessdata. InordertoinputtheDEMtotheMIKE21model,theMIKE21meshpointswereimportedtotheGIS, elevationvalueswereextractedfromtheDEMsurfaceateachmeshpointlocation,andtheresults returnedtotheMIKE21model.Themeshwasdevelopedsuchthatthefloodplaintopographywouldbe adequatelyrepresentedwhilebeingmindfuloflongruntimesassociatedwithmeshesthataretoo detailed;thefinalmeshispresentedinFigure54.ThetriangularmeshelementsonthemainMaple Ridgefloodplainandadjacenttotheriverchannelshaveawidthof20m.Thoseelementsinthe cranberryfieldsandthemostnorthernsectionofthestudyareahaveawidthof35m. ItshouldbenotedthattheflowpathobservedduringtheNovember2014flooding,whichfollows224th Street,wasrefinedtoimprovetherepresentationoftheroadandvariousditches.Similarrefinements weremadeontherightbankoftheNorthAlouettenorthof132ndAvenueandwestof224thStreetto  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis32 Phase2–TechnicalInvestigationsCompletion FinalReport improvetherepresentationofthevariousditchesthatdrainintotheNorthAlouette.Themodelhasa totalof45,856elements. TheboundarybetweentheMIKE11andMIKE21modelsalongtherivershouldfollowthehighpoint alongeachbank,suchasthedikecrest.GISwasusedtomapthisboundary,andtorefineitbasedon requirementsrelatingtomeshelementsizeandshapeinthehydraulicmodel.Oncetheboundarywas finalizedinthemodel,theGISwasalsousedtodetermineMIKE11chainagevaluesforeachnodeinthe boundary.ThisfacilitatedlinkagebetweentheMIKE11andMIKE21models. ResistancevaluesaredefinedinMIKE21asaManning’sMvalue,whichisequivalenttotheinverseof Manning’sN.AsurfaceroughnessdatalayerwasdevelopedintheGISbasedonasimplifiedversionof landusedatasuppliedbytheCityandgeneralroughnessvaluesshowninTable18andFigure55. RoughnessvalueswereextractedateachMIKE21meshpointlocation,andimportedtotheMIKE21 model. Table18.Floodplainresistancevalues. LandUseManning’sN Urban0.08 Rural(residential,smallfarms)0.05 Agricultural0.04 Forest0.06 Water0.01 Other(minepits,significantroadways)0.03  Inordertolimitthenumberofelements,internalstructures(weirs)wereusedtorepresentthe agriculturaldikesasopposedtorefiningtheelementsizenearthedikes.Weirelevationsweresetbased onaverageLiDARelevations.Thisisaslightsimplificationofthesystem,astheweirsweregivena constantelevation,whereasthereissomevariationindikeelevationalongtheirlengths.However,for thepurposesofmodellingfloodlevels,thisisassumedtobearobustassumption. Inadditiontothemajorinputsofboundariesandroughnesssomegeneralassumptionsweremade including: ƒInMIKE21,wetting,floodinganddryingdepthswereselectedbasedonNHC’sexperience withprevioussimilarmodels.Themodelwasassignedawettingdepthof0.2m,aflooding depthof0.15manddryingdepthof0.02m;verysmalltolerancescancausemodel instabilitiesascells‘switch’onandofftoofrequently,whilelargetolerancesmaycause modelinaccuraciesthroughalossorgainofwatervolume.Asmallevaporationvolumewas  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis33 Phase2–TechnicalInvestigationsCompletion FinalReport includedinthemodeltoapproximatelossestogroundwater(groundwaterlossesarenot possibleinthebasicMIKE21setͲup). ƒBasedonthemeshsize,thewatervelocitiesandaseriesoftrials,atimestepof5seconds wasselectedforthemodelruns. ƒTheinitialwatersurfaceelevationwassetataconstantvalueofzero,representingadry startingcondition. 7.3.2 MIKE21ModelCalibration TheMIKE21modelhasnoinflowboundaries,asitisdesignedtorunintandemwiththeMIKE11model. Andtherefore,itisnotpossibletocalibrateorvalidatethismodelbyitself.Themodelwascalibrated andverifiedalongwiththeMIKE11modelusingMIKEFlood. 7.4 MIKEFlood MIKEFloodprovidesthelinkagebetweentheoneͲdimensionalflowinMIKE11andthetwoͲdimensional overlandflowinMIKE21.Thelinksareestablishedthroughaseriesofweirequationsthatconnecta MIKE21cellwiththenearestMIKE11channelsection.Oncealinkisestablished,MIKEFloodtracksthe watersurfaceelevationsinbothMIKE11andMIKE21.Ifeithermodelovertopstheelevationofthe connectionpoint,wateristransferredfromonedomaintotheotherviasource/sinktermsinMIKE21 andlateralinflowsinMIKE11.Thisallowswatertoovertopthechannelbanksandflowontothe adjacentfloodplainordrainfromthefloodplainbackintothechannel. LaterallinksweredevelopedinGISbasedontheDEM.Linksweredrawnathighpointsalongthe boundarybetweenthechannelandfloodplainondikesornaturalhighpoints.Thedevelopmentoflinks isaniterativeprocess,whereadjustmentsaremadetoeithertheMIKE21domainortheMIKE11marker locationssothattheelevationsinthetwomodelsmatch.Ultimately,thelinksweresettobeequalto theMIKE21elevation;nootherchangestothedefaultvaluesweremade. 7.4.1 MIKEFloodandMIKE21ModelCalibration TheMIKEFloodmodelwasalsocalibratedtotheNovember2014floodevent.Informationcollectedby NHCandtheAVAwasusedtoestimatetheobservedfloodextentsandcheckdepths.Adjustmentswere madetotheMIKE11,MIKE21andlinkssuchthatthemodelextentsapproximatetheobservedextents. Someoftheadjustmentsarelistedbelow: ƒThemeshwasrefinedalongtheflowpathnotedduringtheNovember2014flooding,which follows224thStreet,toimprovetherepresentationoftheroadandvariousditches. ƒThemainMapleRidgefloodplainmeshwasrefinedtoa20mwidthtoallowthemodelto includetheimpactsoflocalhighpointsalongtheriverchannel.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis34 Phase2–TechnicalInvestigationsCompletion FinalReport Duringthecalibrationevent,floodingbeganatthelowerreachesoftheNorthAlouetteRiverintheearly eveningof03November2014andflowͲinsfromditchesalongtherightbankoftheNorthAlouetteata chainageof5199m.WatertheninfilledthelowͲlyinglandsoneithersideof136thStreetbetween7PM and10PM.Duringthistime,wateralsostartedtooverflowtheleftbankoftheNorthAlouetteatthe downstreamboundaryoftheMIKEFloodmodel,floodingthelandlocatedbetweenthetwoAlouette rivers. FloodingattheNorthAlouette224thStreetbridgebeganjustpastmidnight,approximatelyanhour beforethepeakofthestorm.Waterthenflowedup224thStreet,northofthebridge.Duringthepeakof thestorm,wateralsoextendedalong136thStreet. Table19.MIKEFloodhighwatermarkwaterlevelagreement. HighWaterMarkLocation PeakWLs(mGSC) ObservedModelledDifference 224thStreet,NorthofNorthAlouetteBridge6.996.980.01 6.966.960.00 6.466.440.02 5.905.900.00 6.085.900.18 136thAvenue,Westof224thStreet4.454.070.38 4.184.030.15 4.023.700.32 3.793.350.44 3.913.300.61  Itshouldbenotedthatthemodeldidnotaccuratelycapturethefloodingalongsidetheintersectionof 224thStreetand136thAvenue.Observationssuggestthatmostofthiswaterwascarriedintheadjacent ditch,partofthelocalminorstormwatersystemthatwasnotincludedinthislargescalefloodmodel. Therelativelylargedifferenceinpeakwaterlevelsmodelledwestof224thSt.maybecausedinpartby thefactthatthemodeldidnotcapturetheroutingwaterthroughthisditch.Thisshouldbeconfirmed usingfloodextentsdatacollectedduringfuturefloodevents. 7.4.2 MIKEFloodandMIKE21ModelVerification ItwasnotpossibletocompleteadetailedverificationoftheMIKEFloodandMIKE21modelwiththe January2015event,astheeventwaslowerandnofloodingextentswererecorded.Themodelresults weresimplyreviewedtoconfirmthatnofloodingextentsweregenerated.   NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis35 Phase2–TechnicalInvestigationsCompletion FinalReport 7.5 ModelLimitations ThesimulationoftheNovember2014floodconfirmsthatthemodeliscapableofpredictingflood extentsandwaterlevels,andprovidesinsightsintotheprogressionoffloodinginMapleRidge.The modelperformedwell,withmodelledandobservedlateralextentsandhighwaterlevelsmatching closely.Themodelshouldbeseenasavalidandusefultoolforfloodmanagementplanningforthe region. However,themodeldoeshavelimitationsthatneedtoberecognized.Itassumestheriverbedand banksarefixed.However,bankerosion,sedimentationandlogjamformationcanalloccurduringmajor floods,especiallyinthemoredynamicNorthAlouetteRiver.Theseprocessescanaffectthelocal hydraulicconditionsconsiderably.Itshouldalsobenotedthatthecomputedfloodextentsrepresent riparianfloodingfromthemainriverchannels.Themodelisnotintendedforrepresentinglocalised pondingonisolated,lowͲlyingportionsofthefloodplaincausedbytheaccumulationofrainwateror meltingsnow.Localisedpondingiscontrolledbyrainfallintensity,localtopography,drainage characteristicsofthesoilandthecapacityofdrainagestructuressuchasculvertsandditches. 7.6 ModelResults 7.6.1 SensitivityTesting Partoftheprocessofdevelopinghydraulicmodelsisconceivingasetofreasonableassumptionsthat definethemodelstructureanditsinputs.Someoftheassumptionsmadeduringthemodel developmentrelatetomodelboundariesandchannelandfloodplainroughness.Sensitivityanalyseson theseassumptionswereconductedbyreͲrunningthemodelwithslightvariationsontheassumptions. Theresultsofthesensitivityanalysesarepresentedinthissection. ModelInflows Waterlevelsandinundationareaareafunctionoftheinflowsusedforthemodelling.Totestthe sensitivityofthis,themodelwasrunwithsomesimplechangestothe5Ͳyeardesigninflows.All5Ͳyear designinflowstothemodel(mainstemandtributary)wereincreasedanddecreasedby10%.This variationinpeakflowscorrespondedtoanaveragevariationinwaterlevelsofapproximately15cm alongthelengthoftheriver,withatotalrangeof10cmto20cm,dependingonlocation. TheimpactonwaterlevelsandinundationareasarepresentedinTable20.     NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis36 Phase2–TechnicalInvestigationsCompletion FinalReport Table20.Peakriverwaterlevelsforflowsensitivityanalysis. GaugeNameRiverChainage (m) PeakWLs(mGSC) 5yrResults+10%FlowͲ10%Flow 232ndStreetHWMNorthAlouette1026515.0915.1715.06 AVAGaugeNorthAlouette993713.1113.1813.08 MapleRidgeGaugeNorthAlouette83407.617.627.42 PittMeadowsGaugeAlouetteConfluence313.533.603.49 SouthAlouetteWSCSouthAlouette1897314.2014.3014.11  RoughnessCoefficients(ChannelandFloodplain) Akeyparameterinanyhydraulicmodelistheroughnesscoefficient.ForacoupledMIKEFloodmodel, roughnessparametersareestimatedforboththechannel(inMIKE11)andforthefloodplain(in MIKE21).FortheAlouettefloodmodel,theNovember2014calibrationeventwasusedtoselect roughnessvaluesinbothmodeldomains.Totestthesensitivityoftheseinputs,twoadditionalmodel runswerecompletedwherethechannelandfloodplainroughnesswerealladjustedupandthendown by10%.Aswiththeothersensitivityruns,the5Ͳyeareventwasusedasabasecase.Resultsofthis analysissuggestarangeof9cmto21cmintotalwaterlevelvariation,withanaveragevariationof 13cm(Table21). Table21.Peakriverwaterlevelsforroughnesssensitivityanalysis. GaugeNameRiverChainage (m) PeakWLs(mGSC) Calibration+10%MͲ10%M 232ndStreetHWMNorthAlouette1026515.0915.1615.03 AVAGaugeNorthAlouette993713.1113.1813.05 MapleRidgeGaugeNorthAlouette83407.617.407.66 PittMeadowsGaugeAlouetteConfluence313.533.583.49 SouthAlouetteWSCSouthAlouette1897314.2014.2914.12  7.6.2 DesignFloodModelling Themodelhasbeenrunforsevendesignscenariosfromthe2Ͳyeareventthroughthe200Ͳyearevent. DesigninflowhydrographscorrespondtothosedevelopedinSection4.4andincludea10%flow increaseontheNorthAlouetteandalltributariesasanallowanceforclimatechange(Table7).All unregulatedinflowsweretimedtopeaksimultaneously.OutflowsfromtheAlouetteReservoirtothe downstreamSouthAlouetteRiverincludea7.5hourdelayduetoreservoirrouting.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis37 Phase2–TechnicalInvestigationsCompletion FinalReport DownstreamboundaryconditionsweresettoalargewinterflowontheFraserRiverandincorporatea year2100sealevelriseallowanceof1m,whichyieldsahighwaterlevelof3.1mGSCattheconfluence ofthePittandAlouetteRivers.Thisdownstreamwaterlevelwasheldconstantthrougoutthedesign events,astheriseandfallofwaterlevelsduetolargeeventsontheFraserismuchslowerthanthatof theAlouetteRiverssystem.Thesealevelriseallowanceonlyaffectswaterlevelsattheverydownstream endsoftherivers. ItshouldbenotedthattheTrethewayDikeislocatednearthewesternedgeofthestudyarea.Thisdike isknowntobesubstandardandtheareawhichitprotectswouldbeinundatedatflowslessthanthe 200ͲyeareventontheAlouetteRivers.Asnobreachanalysisordetailedreviewofthisdikewas completedaspartofthiswork,thecorrespondingfloodlevelsinthisareaarenotknown.Forthe purposesoffloodmodelling,extentmapsandhazardmaps,thisareaisshadedingrey. FloodextentmapsforeachofthesevendesignscenariosareavailableinMap1toMap7.Threeflood scenarios;the2Ͳyear,25Ͳyearand200Ͳyearfloodsarecomparedtoprovideanoverviewofinundation: 2ͲYearFloodDepths The2Ͳyearfloodextentsmappingshowsmoreextensivefloodingthanthe2014calibrationevent, suggestingthecalibrationfloodhadareturnperiodunder2years.Whilethe2014eventhadonly localizedfloodingatlowpointsadjacenttotheriver,the2Ͳyearextentsshowaninterconnectivity betweenlowpoints.Waterisshownflowingfreelyalonglowersectionsofthefloodplain,including areasnorthoftheNorthAlouetteRiversandinbetweentheNorthandSouthAlouetteRivers. ItisimportanttonotethatthereareseveralareasadjacenttotheSouthAlouetteRiverthatshowwater depthsof1morhigher.Thelargestoftheseareasarelocatedbetween224thStreetandtheAbernethy Wayandupstreamofthe232ndStreetbridge.Bothoftheseareasincluderesidentialdevelopment leadingtopotentialevacuationofresidents. 25ͲYearFloodDepths Bythe25Ͳyearevent,amajorityofthestudyareaexperiencessomeinundation.Althoughmostofthe inundatedarearemainsbelow0.5mofdepth,walkingordrivingbecomepotentiallydangerous activities.ThesameareasadjacenttotheSouthAlouetteRiver(between224thStreetandthe AbernethyWayandupstreamofthe232ndStreetbridge)requireresidentialevacuationandhave localizeddepthsofabove2m.AgriculturalandundevelopedlandneartheNorthAlouetteGreenwayis alsoinundatedtoadepthgreatthan1m. The25Ͳyeareventalsoshowstheformationofdeepchannelflowcrossingthefloodplain.Narrow channelswithdepthsofwatergreaterthan1mareobservedcrossingbetweenthetworiversand followinglocalditchsystemsnorthoftheNorthAlouetteRiver.Thischannelizedflowisespecially dangerousandisbetterhighlightedinthehazardmappinginthefollowingsection.   NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis38 Phase2–TechnicalInvestigationsCompletion FinalReport 200ͲYearFloodDepths Duringthe200Ͳyearfloodevent,waterlevelsarehighenoughtocovermostofthelocalhighpoints withinthefloodplain.Muchofthefloodplainexperienceswaterlevelsabove0.5m,floodingtheground floorofbuildingsandcausingelectricalfailures.Thisisalsodeepenoughtocausevehiclestobecarried offroadways.Undertheseconditions,safegroundtransportisnotpossible.Forhistoricalreference,this eventislargerthanthefloodeventexperiencedontheNorthAlouetteRiverin2007. ResidentialdevelopmentalongtheSouthAlouetteandportionsoftheNorthAlouetteexperienceflood depthsinexcessof1mandshouldbeevacuated.Evacuationisalsorecommendedforresidentswithin thefloodplainbetweenthetworiverswherewaterdepthsexceed1mandflowmaybecome channelized.InundationoftheagriculturalandundevelopedlandneartheNorthAlouetteGreenwayis expectedtoexceed2mofdepth. 7.6.3 FloodHazardMapping FloodhazardmapsforplanningandemergencymanagementareincludedinMaps8toMap14andare basedontheresultsofthedesignfloodmodelling.Hazardratingisafunctionofwaterdepthand velocity(m*m/s).Hazardratingsarebasedonthe‘HazardtoPeoplefloodthresholds’determinedinthe UK,whicharesummarizedinTable22below(UKDEFRA/EA2006): Table22.Floodhazardratings. HazardRating depth*(velocity+0.5) (mxm/s) Degreeof FloodHazardDescription <0.75Low Caution “Floodzonewithshallowflowingwaterordeepstanding water” 0.75to1.25ModerateDangerousforsome(e.g.children) “Danger:floodzonewithdeeporfastflowingwater.” 1.25to2.5SignificantDangerousformostpeople “Danger:floodzonewithdeepfastflowingwater.” >2.5Extreme Dangerousforall “Extremedanger:floodzonewithdeepfastflowing water.”     NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis39 Phase2–TechnicalInvestigationsCompletion FinalReport 2ͲYearFloodHazardRating The2Ͳyearfloodhazardmappingshowsrelativelylowhazardratingsacrosstheinundatedextents. Thereissomeinterconnectivitybetweenlowpointsandwaterflowsfreelyalonglowersectionsofthe floodplain.However,moderateandsignificanthazardsarepresentonlyinsmallcreeksandditches. ExceptionsarefoundadjacenttotheSouthAlouetteRiverbetween224thStreetandtheAbernethyWay andupstreamofthe232ndStreetbridge.Intheselocations,waterdepthsandvelocitiesreach moderatetosignificantratings.Significanthazardsaredangerousformostpeople;theseareasare withinthefloodzoneandcontaindeep,fastflowingwater.Asnotedintheprevioussection,bothof theseareascontainresidentialdevelopmentandwouldlikelyneedtobeevacuated. 25ͲYearFloodHazardRating Bythe25Ͳyearevent,amajorityofthestudyareahasahazardratingandcautionisrecommended. ModeratetosignificanthazardratingsareassignedtothelandsadjacenttotheSouthAlouetteRiver andtheagriculturalandundevelopedlandneartheNorthAlouetteGreenway.Moderatetosignificant hazardratingsalsoapplytoareasadjacenttotheNorthAlouetteRivernearthe232ndStreetbridge, 132ndAvenuebridgeand224thStreetbridge.Theseareasbecomefloodzoneswithdeep,fastflowing waterandaredangerousformostpeople. Significanttoextremehazardratingsareappliedtothedeepchannelscrossingthefloodplainandalong theSouthAlouettebetween224thStreetandtheAbernethyWayandupstreamofthe232ndStreet bridge.Theseareasshouldbeassociatedwithanextremedangerrating. 200ͲYearFloodHazardRating Duringthe200Ͳyearfloodevent,mostofthelocalhighpointswithinthefloodplainarenolongerdry andcautionisrecommendedthroughoutthefloodplain.Thefloodplainisinterlacedwithlowlying sectionsandchannelizedflowwithsignificanthazardratings,dangerousformostpeople.Underthese conditions,safegroundtransportisnotpossible. SignificanttoextremehazardratingsarealsoappliedtomuchofthefloodplainalongtheSouth AlouetteRiverandtothelandneartheNorthAlouetteGreenway.AlongtheNorthAlouette,significant hazardratingsarenotedinareasadjacenttotheNorthAlouetteRivernearthe232ndStreetbridge, 132ndAvenuebridgeand224thStreetbridge.Fullevacuationshouldbecompletedfromtheseareas priortopeakinundation.Thisrequiresalargeandhighlyorganizaedevacuationplanandthe implementationofahazardwarningsystem.   NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis40 Phase2–TechnicalInvestigationsCompletion FinalReport 8 FLOODPLAINMAPPING The200ͲyearfloodplainmappingisincludedundertheFloodplainMappingtab.The200Ͳyearflood constructionlevels(FCLs)shownincorporateafreeboardof0.6m.Alsoincludedisthe25Ͳyearflood levelwithafreeboardallowanceof0.6m.This0.6mfreeboardallowanceactsasamarginofsafetyto accountforvarioussourcesofuncertaintyinthemodelaswellaslocalvariationsintopographyand correspondstotheprovincialstandard.Mappingwascompletedusingthe200Ͳyearand25Ͳyearresults describedinSection7.6andincludea10%increaseinflowsonallunregulatedflowsourcestoallowfor climatechangeimpactsasrecommendedbyAPEGBC(2012).Allunregulatedinflowsweretimedtopeak simultaneously.OutflowsfromtheAlouetteReservoirtothedownstreamSouthAlouetteRiverincludea 7.5hourdelayduetoreservoirrouting.Downstreamboundaryconditionsweresettoalargewinter flowontheFraserRiverandincorporatea1msealevelriseallowanceforyear2100conditions,alsoas recommendedbyAPEGBC(2012). LiDARdatasurveyedin2014wasusedtocreateadigitalelevationmodel(DEM)forthestudyarea.The DEMwasmodifiedtoincludegroundsurveydataforthe132ndAvenuebridgeontheNorthAlouette River,the224thStreetbridgeontheNorthAlouetteRiverandchannelsurveysfortheNorthandSouth AlouetteRivers.ThemapdepictsfloodlevelsbasedongroundconditionsrepresentedintheDEM.Any changestoground/channelelevations,landuseorbuildingsfromthoseincludedinthemodelwillaffect thefloodlevelsandrendersiteͲspecificinformationobsolete. Althoughthemodelgeometrywaskeptfixed,variations(erosion,degradationoraggradation)may occurduringafloodeventand/orovertime.ThemapdoesnotprovideinformationonsiteͲspecific hazardssuchaslanderosionorsuddenshiftsinwatercourses.Channelobstructions,localstormwater inflows,groundwaterorotherlanddrainagecancausefloodlevelstoexceedthoseindicatedonthe map.Landsadjacenttoafloodplainmaybesubjecttofloodingfromtributarystreamsthatarenot indicatedonthemaps. TheaccuracyofthelocationofthefloodplainboundaryislimitedbytheaccuracyoftheDEM,model boundaryconditionsandmodelparameters.Locallyraisedareashavenotbeenmappedinthe floodplainextents.AqualifiedprofessionalmustbeconsultedforsiteͲspecificengineeringanalysis. ItshouldbenotedthattheTretheweyDikeatthedownstreamendofthestudyareadoesnotmeet provincialdikingstandardsandwouldlikelybreachatsomeflowlessthanthe200Ͳyearflood.Thearea behindthedikeisconsideredpartofthefloodplainalthoughnotspecificallymappedduetotheabsence ofbreachmodelling. The200Ͳyearfloodextentmapshowsboththe2016extentsrecommendedbyNHCandthecurrently approvedfloodextents,whichwerepublishedin1990.Forthemostpart,extentsfromthetwostudies areverysimilar.However,therearesomelocationswherethe1990extentsexceedtherecommended 2016extents.Thelargestvariationscanbeobservedatthenorthedgeofthefloodextentsnear232nd Streetasaresultofthebridgereplacement.Also,somevariationisexpected,asthe1990mappingwas completedusing1mtopographicdata,whichisfarlessdetailedthantheLiDARobtainedin2014.The  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis41 Phase2–TechnicalInvestigationsCompletion FinalReport designflowsusedforthe1990mappingarealsoslightlymoreconservative.Yet,thereareareaswhere the2016inundationboundariesexceedthe1990limits,slightlyincreasingthefloodplain. ThefinalizedinundationboundariesincludedinthemapwereverifiedduringafieldvisitbyNHCstaffon 1December2015.Locationsandlocaltopographywerereviewedbasedonvariationsbetweenmodel 200yearFCLresultsandthe1990mapping. 9PROJECTSUMMARY,CONCLUSIONSANDBENEFITS 9.1 SummaryandConclusions 1. ThehydrologicregimesoftheNorthandSouthAlouetteRiversaredistinctlydifferent.The NorthAlouette,beingsmaller(drainageareaof37.3km2)andunregulated,respondsquicklyto stormevents,particularlylargerainorrainͲonͲsnowevents.Themuchlargerwatershedofthe SouthAlouette(totaldrainageareaof234km2)includestheregulatedAlouetteLakewhichis dominatedbyspringfreshettypeevents.However,downstreamofthedam,peakflowsoccur duringthewinter. 2. Bothriversaredynamicandtheirchannelgeometryhaschangedoverthepastcentury;these changesaremoreapparentonthesmaller,unregulatedNorthAlouettesystem.Thereis evidencethatsomeaggradationmaybetakingplaceinthelowerNorthAlouettestudyreach. TheregulationoftheSouthAlouetteRiver,whichdecreasespeakflowsdownstreamofthedam, hasalteredthenaturalgeomorphologyofthissystem,withsomecorrespondingreductionin channelsize.Duetothechannelchangesandextensivedevelopmentwithinthefloodplain,the Cityidentifiedaneedtoupdatethefloodplainmappingfrom1990. 3. ChannelcrossͲsectionsurveysfrom2014,highͲqualityLiDARdataalsofrom2014,andthe collectionofcalibrationdataduringthewinterof2014Ͳ2015,allowedfordevelopmentofa sophisticated2ͲdimensionalMIKEFloodnumericalmodel.Thehydraulicmodelwasusedfor simulatingthefloodlevelscorrespondingtothe2,5,10,25,50,100and200Ͳyeareventsand subsequentgenerationoffloodextentandfloodhazardmappingfortheseflows.Theupdated andimprovedmapping,basedoncurrenttopographicinformation,recentflowestimatesand muchimprovedhydraulicmodellingmethods,ismoreaccuratethanthe1990floodplainmaps andreplacesthese. 4. The200ͲyearupdatedpeakflowsontheNorthAlouetteRiverincludea10%increasetoaccount forprojectedapproximateclimatechangeimpactstotheyear2100,asrecommendedinthe APEGBC(2012)guidelines.NoextraallowancewasmadeforclimatechangeontheSouth AlouetteRiverforoutflowsatthedam,asitisassumedthatBCHydrowilladjusttheiroperating proceduresovertimetocompensateforclimatechange.Comparedtotheprevioushydraulic modellingboundaryconditionsusedforthe1990floodplainmapping,theupdatedNorth AlouetteRivermaximuminstantaneousflowis6%lowerandtheupdatedSouthAlouette  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis42 Phase2–TechnicalInvestigationsCompletion FinalReport maximuminstantaneousflowis11%lower,implyingthepreviousvalueswereconservativein viewofpresentlyavailablerecords. 5. Asealevelincreaseof1matthemouthoftheFraserRiverwasassumedbutwasfoundtoonly affecttheverydownstreamreachesoftheriverswithinthestudyarea.Assumingahighwinter tide,includingsealevelrise,andalargewinterflowontheFraserRiveryieldedawaterlevel estimateof3.1mGSCattheconfluenceofthePittandAlouetteRivers. Theupdateddownstreamstartinglevelis1.6mlowerthanthestartinglevelusedin1990and reflectswinterconditions,whentheAlouetteRiverspeak,ratherthanthefreshetlevelas previouslyused.(ThecurrentfreshetdesignlevelatPittRiverconfluenceis5.5manddoesnot affectdesignlevelsinthestudyarea. 6. Floodextentmappingforthe200Ͳyearfloodsuggestswaterlevelswillcovermostofthelocal higherͲelevationareaswithinthefloodplain.Muchofthefloodplainwillexperiencewater depthsabove0.5m,typicallyfloodingthegroundfloorofbuildingsandcausingelectrical failures.Thisdepthwillcausevehiclestobecarriedoffroadwaysandsafegroundtransportwill generallynotbepossible.Forhistoricalreference,thiseventislargerthanthefloodevent experiencedontheNorthAlouetteRiverin2007. 7. Floodhazardmappingforthe200Ͳyearfloodshowsthatthefloodplainisinterlacedwithlow lyingsectionswhichexperienceextensivefloodingandsemiͲchannelizedflow,causing significanthazardratings.‘Significant’to‘Extreme’hazardratingsareapplicabletomuchofthe floodplainalongtheSouthAlouetteRiver,landneartheNorthAlouetteGreenwayandalong theNorthAlouetteRivernearthe232ndStreet,132ndAvenueand224thStreetbridges. 8. Floodplainmappingcorrespondingtothe200ͲyearfloodwaspreparedfortheNorthandSouth AlouetteRivers’studyarea.The200Ͳyearfloodconstructionlevels(FCLs)includeafreeboard allowanceof0.6m.Themappingalsoshowslevelscorrespondingtothe25Ͳyearfloodlevel including0.6mfreeboard.Isolinesarebasedonthe2Dmodeloutput.Theinundation boundarieswereverifiedinthefieldbyNHCstaffandaresimilartothosepreparedin1990by theprovincialgovernment.Comparedtothepreviousmapping,thefloodplainisreduced somewhatinafewareasandslightlyincreasedinothers. 9.2 ProjectBenefits OverthepastdecadesfloodingalongtheAlouetteRivers,especiallytheNorthAlouette,hasbecomea sourceofincreasingconcernfortheresidentsofthefloodplains.In2007,extensivefloodingprompted thecreationofamultiͲstakeholderTaskForcewhichhadasitsobjectivestocompileinformationon floodissuesanddevelopastrategytomanageand/orreducethefloodriskofthearea.Sixfocusareas were:1)Riverhydrology,hydraulicsandfloodplainmapping;2)Riveroperationandmaintenance;3) Floodresponse;4)Floodproofingandprotection;5)Datacollectionandinformationsharing;and6) Floodplainmanagementrolesandresponsibilities.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis43 Phase2–TechnicalInvestigationsCompletion FinalReport Theinformationcompiledandfloodplainmapsdevelopedaspartofthepresentprojectformsakeytool inmeetingtheTaskForceobjectivesandaidingtheCityinmovingforwardtoreducepotentialfuture floodlosses.Keybenefitsoftheprojectare: x AreaspronetofloodingduringdifferentreturnperiodeventsarenowidentifiedandupͲtoͲdate FCLsestimated.Overtime,appropriatefloodprotectionmeasures(structuralandnonͲ structural)canbedevelopedforaffectedhousingandlongͲrangeimprovementsto infrastructurebeplanned. x Thehydraulicmodelformsatoolforevaluatingtheimpactonfloodlevelscausedbychanges withinthefloodplainandtheriverchannels.Theeffectsonfloodlevelsresultingfromfill placement,newdikingordevelopmentonthefloodplaincanbeevaluatedusingthemodel.The benefitsofenlargingbridgeopenings/culvertsorremovinggraveldepositionsanddebriscanbe assessed. x Thehazardmappingcanbeusedforissuingfloodwarningstoareaslikelytobeaffectedduring particulareventsandfordevelopingemergencyresponseprocedures.Themapsindicatewhich roadswillbemostseverelyaffectedataparticularflowandsafeaccess/egressroutescanbe identified. x Themappingformsapubliceducationaltooltoinformresidentsregardingfloodhazardsandto provideguidanceonimprovingresidents’safety. x Animportantcomponentoffloodpreparednessisfloodrecovery.(Thiswasclearly demonstratedaftertheCalgary2013flooding,whererecoveryplanshadbeendevelopedin advance.)Thepresentmappingproductswillaidindevelopingfloodrecoveryprocedures. TheCity’sinvestmentinfloodplainmappingproductsisofsignificantvalueandfacilitates:1)the identificationofpresentfloodhazards;2)evaluationofanyplannedfuturechangesinthe floodplain/riverchannels;and,3)developmentoffloodmanagementtoolsasoutlinedinSection10.2. 10 RECOMMENDATIONS 10.1 TechnicalRecommendations 1. ItisrecommendedthattheCityadopttheupdated200Ͳyearfloodplainmapsand incorporatetherevisedFCLsintofloodbylaws.Floodbylawsservetoclarifyfuture developmentguidelinesandprovideregulationsregardingbuildingrenovationsandany modificationtothefloodplain.Typically,bylawshavetheaddedbenefitofreducingthe City’sliability.Theyaregenerallydevelopedintwophases,thefirstphaserequiring engineeringinputandapplicationoftheavailablefloodplainmappingandthesecondphase involvinglegalreview.  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis44 Phase2–TechnicalInvestigationsCompletion FinalReport 2. ItisrecommendedthatafloodearlyͲwarningsystembedevelopedfortheNorthAlouette. NHCpreviouslyreviewedthepracticalityofinstallingrealͲtimeflowgaugesintheupper watershedbutconcludedthatthesewouldnotprovideabeneficialincreaseinadvance floodwarning.Similarly,hydrologicrunoffmodellingisnotapracticaloptionsince insufficientmodelcalibrationdataisavailable.Asanalternative,realͲtimeprecipitationdata couldbeusedinconjunctionwithexistingwaterlevelgaugestoobtainvaluableinformation duringfloodevents.Attheveryleast,onerealͲtimeprecipitationgaugewouldprovidean indicationofanticipatedchangesinwaterlevelsdownstreamorpotentiallyallowthe detectionofadebrisblockageontheupperNorthAlouette.Theworkwouldinvolve reviewinghistoricpeakflowsandprecipitationrecordstoexploreifareasonable relationshipcanbedevelopedbetweenthetwo,incorporatingantecedentground conditions. 3. ThehydraulicmodelprovidesasnapͲshotintimeofriverconditionscorrespondingtothe estimatedfloodflowsandthesurveyedcrossͲsections/floodplain.Themodeland correspondingmappingneedtobeupdatedovertime,typicallyatleasteverytenyearsor followingalargeflood.Thefollowingspecificsarerecommended: a) Recordpeakflows,highwatermarksandfloodextentinformationduringfuturefloods (returnperiodof5Ͳ10yearsormore)tofineͲtunethepresentmodelcalibrationand increasethefloodplainmappingaccuracy. b) EncourageWSCtomaintaintheirgaugesontheAlouetteRiversystemsandensurethat ratingtablesarekeptcurrent.TheAVAandMapleRidgegaugesarealsovaluableand needtobemaintained.MakeallinformationavailableinrealͲtime. c) Overtime,monitortemperature,precipitationandflowsinthestudyareatoidentify potentialclimatechangeimpacts. d) ConfirmwithBCHydrotheassumptionsmaderegardingfutureoperatingproceduresof theAlouetteDam. e) Monitorchannelchangesandanychangeswithinthefloodplainandresurveyas deemednecessary.Updatethehydraulicmodelandfloodplainmaps.  10.2 FloodManagementRecommendations ConsideringthefrequencyandseverityoffloodingwithintheAlouetteRiverwatersheds,itis recommendedthatanintegratedfloodmanagementplanbedeveloped,incorporatingbothstructural andnonͲstructuralmeasures.Theplanshouldincorporatethefollowingcomponents:  NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis45 Phase2–TechnicalInvestigationsCompletion FinalReport 1. Developafloodemergencypreparednessandresponseplan.Utilizingthefloodplainand hazardmapping,theplanshouldbepreparedjointlybetweentheCityanditsFirst Responders.Highpriorityshouldbegiventosafeaccess/egresstoreducetheriskoflossof lifeduringlargefloods.ThisisofparticularconcernwithinthelowͲlyinglandbetweenthe tworivers,wherepreͲplanningiscriticaltothesafetransportandpossibleevacuationof residents. 2. Developguidelinesforafloodrecoveryprogram.Theprogramneedstoclarifytheimpacts offlooding,likelyinundationdurations,thepotentialextentofdamagesandproceduresfor recovery. 3. CarryoutavulnerabilityassessmenttoidentifythepotentialforlossͲofͲlife,economic losses,socialandenvironmentallossesresultingfromaparticularfloodorarangeoffloods. Thepurposeoftheassessmentistoidentifycriticalareaswherepotentiallossesarehighest andfloodmitigationmosturgentlyneeded.Theworkcanbecompletedateitheran overviewlevelorasamoredetailedevaluation. 4. Basedonidentifiedhighriskareas,developsuitablefloodmitigationoptionsandassociated approximatecostsforinitialevaluation.Improvementsinoneareamustnotnegatively affectfloodhazardsinanotherarea.   NorthAlouetteandSouthAlouetteRiversAdditionalFloodplainAnalysis46 Phase2–TechnicalInvestigationsCompletion FinalReport REFERENCES APEGBC2012.ProfessionalPracticeGuidelines–LegislatedFloodAssessmentsinaChangingClimatein BC.ProfessionalPracticeGuidelines. BCEnvironment1990.ADesignBriefontheFloodplainMappingStudyAlouetteandNorthAlouette Rivers.FloodplainMappingDesignBrief. CityofMapleRidge2010.DiscussionwithOperationsStaff(RussCarmichael,WayneHardy,EdMitchell, BernieSerneandRalphKivi),December1st,2010. NHC2006.LowerFraserRiverHydraulicModel.FinalReport.PreparedforFraserBasinCouncil, December2006. NHC2010.NorthAlouetteandSouthAlouetteRivers’AssessmentandFloodplainAnalysis:Phase1Ͳ Scoping.FinalReport. UKDEFRA/EnvironmentAgency2006.R&DOutputs:FloodRiskstoPeople,Phase2.FD2321/TR2 GuidanceDocument.    Figures """"ú ú úúú úúú úSouthAlouetteRiverN orthAlouetteRiverCranberry FieldsEqui-Sport CentreMaple Ridge ParkHorseman's ParkSilver Valley132 AVE224 ST232 ST124 AVE227 ST128 AVEABERNETHY WAY232 ST127 AVEPARK LANE136 AVE236 ST232nd St. Bridge N224th St. Bridge N232nd St. Bridge S224th St. Bridge S132nd Ave. Bridge N08MH00608MH005AM & MSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_AM_Fig_OverviewMap1.mxdJob: 300349FIGURE 1Date: 08-DEC-2015Study AreaALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSISDATA SOURCES:- City of Maple Ridge, 2011 Orthophoto- GeoBase National Roads Network- BC Freshwater Atlas- Esri World Street MapCoordinate System: NAD 1983 UTM ZONE 10NUnits: METRESSCALE - 1:12,000±Project LimitsúBridge"WSC Hydrometric Station"AVA Hydrometric Station"CMR Hydrometric StationRiverDikeRoad0 100 200 300 400 500M South Alouette RiverNorth Alouette RiverDEWDNEY TRUNK RD203 ST216 ST 240 ST 224 ST RIVER RDNEAVES RD227 ST 256 ST 124 AVE123 AVEHANEY BYPASSLOUGHEED HWY210 STGOLDEN EARS WAY128 AVE132 AVEGOLDENEARSBRIDGEABERNETHY WAYHAMMOND RD 232 ST AM & MSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_AM_Fig2_LanduseMap.mxdJob:300349FIGURE 2Date: 30-NOV-2015Current Land UseALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSISDATA SOURCES:- City of Maple Ridge- BC Freshwater Atlas Watershed Boundaries- Esri World Imagery- Esri World Street MapCoordinate System: NAD 1983 UTM ZONE 10NUnits: METRESSCALE - 1:43,000±0 500 1,000 1,500MRiverProject LimitsWatershed BoundaryCurrent Land UseCommercialIndustrialHigh Density ResidentialMedium Density ResidentialLow Density ResidentialPublicAgriculturalPark, Green Space andConservation Areas ú ú úúú úúúúúúúúúúwvwvwv wv wv wv wvSouthAlouetteRiverNorthAlouetteRiverMapleRidgePark232nd St. Bridge N224th St. Bridge N232nd St. Bridge S132nd Ave. Bridge N132 AVE224 ST 232 S T AM & MSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_AM_Fig3_NorthAlouetteGeomorph.mxdJob:300349FIGURE 3Date: 08-DEC-2015North Alouette RiverOverview of Geomorphic FeaturesALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSISDATA SOURCES:- 2011 orthoimagery supplied by City of Maple Ridge.Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESSCALE - 1:6,000±0 50 100 150 200 250MúBridgewvErosion SiteúDeposition Site """"SouthAlouetteRiverN orthAlouetteRiver132 AVE224 ST232 ST124 AVE227 ST128 AVEABERNETHY WAY232 ST127 AVEPARK LANE136 AVE236 ST15758286231 6 7 41 71418 73857722 24 29212678727119847670 803079208131 251093174521420615-19 1582122121917 18 1011133-1 1-1 2-1 8 51411613AM & MSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_AM_Fig4_HistoricalRiverCrossSections.mxdJob: 300349FIGURE 4Date: 08-DEC-2015Historical Cross SectionLocationsALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSISDATA SOURCES:- City of Maple Ridge, 2011 Orthophoto- BC Freshwater Atlas- Esri World Street MapCoordinate System: NAD 1983 UTM ZONE 10NUnits: METRESSCALE - 1:12,000±Project Limits"WSC Hydrometric Station"AVA Hydrometric Station"CMR Hydrometric Station2008 Survey1981 SurveyRiverStream0 100 200 300 400 500M HistoricCrossSectionComparisononNorthAlouetteRiver0246810120 50 100Elevation(mGSC)DistancefromLeftBank(m)NorthAlouetteRiverͲ224St.Bridge1981ͲXS72008ͲXS800246810120 50 100 150 200Elevation(mGSC)DistancefromLeftBank(m)NorthAlouetteRiverͲ132Ave.Bridge1981ͲXS122008ͲXS78Figure5 HistoricCrossSectionComparisononSouthAlouetteRiverFigure60510152025300 50 100 150 200Elevation(mGSC)DistancefromLeftBank(m)SouthAlouetteRiverͲ224St.Bridge1981ͲXS102008ͲXS250510152025300 50 100 150 200 250 300Elevation(mGSC)DistancefromLeftBank(m)SouthAlouetteRiverͲ232St.Bridge1981ͲXS182008ͲXS18051015202530-100 -50 0 50 100 150 200Elevation(mGSC)DistancefromLeftBank(m)SouthAlouetteRiverͲUpstreamof232St.1981ͲXS222008ͲXS14051015202530-100 -50 0 50 100Elevation(mGSC)DistancefromLeftBank(m)SouthAlouetteRiverͲBetween232St.and224St.1981ͲXS142008ͲXS21 0.00.20.40.60.81.01.21.4JanͲ60 JanͲ65 JanͲ70 JanͲ75 JanͲ80 JanͲ85 JanͲ90 JanͲ95 JanͲ00 JanͲ05WaterLevel(mGaugeDatum)SpecificGaugeCurveͲ08MH006ͲNorthAlouetteRiverSelectedFlowsandTrendlines0.250.511.523581425Linear (0.25)Linear (0.5)Linear (1)Linear (1.5)Linear (2)Linear (3)Linear (5)Linear (8)Linear (14)Linear (25)RecordedFlow+/Ͳ5%(m3/s)Figure7 0.400.450.500.550.600.650.700.750.80JanͲ75 JanͲ80 JanͲ85 JanͲ90 JanͲ95 JanͲ00 JanͲ05WaterLevel(mGaugeDatum)SpecificGaugeCurveͲ08MH005ͲSouthAlouetteRiverSelectedFlowsandTrendlines1.051.251.651.82.533.54Linear (1.05)Linear (1.25)Linear (1.65)Linear (1.8)Linear (2.5)Linear (3)Linear (3.5)Linear (4)RecordedFlow+/Ͳ5%(m3/s)DamModificationFigure8 1959 224th St 232nd St 132nd Ave 128th Ave 136th Ave 1974 224th St 232nd St 132nd Ave 128th Ave 1989 224th St 232nd St 132nd Ave 128th Ave 136th Ave Figure9a:HistoricalAirphotosofStudyAreainSequence 2004 224th St 232nd St 132nd Ave 128th Ave 136th Ave 2008 224th St 232nd St 132nd Ave 128th Ave 136th Ave Figure9b:HistoricalAirphotosofStudyAreainSequence Silver Valley Silver Valley Alouette LakeNorth Alouette RiverSouth Alouette RiverHANEY EASTMAPLE RIDGE KANAKA CREEKPITT POLDERHANEY UBC RF ADMINBasin: Alouette RiverArea: 251 sq.kmBasin: NorthAlouette RiverArea: 42 sq.kmBasin: Blaney CreekArea: 27 sq.kmBasin: McKenny CreekArea: 5 sq.kmBasin: Fenton Road SloughArea: 5 sq.kmAM & MSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_AM_Fig10_Watershed.mxdJob:300349FIGURE 10Date: 30-NOV-2015Alouette Rivers WatershedsALOUETTE RIVERS ADDITIONALFLOODPLAIN ANALYSISDATA SOURCES:- Streams and watershed polygons: BC FreshwaterAtlas- Orthophotos: ArcGIS Map Service, World_Imagery- Inset map background: ArcGIS Map Service,StreetmapCoordinate System: NAD 1983 UTM ZONE 10NUnits: METRESSCALE - 1:135,000±012345KMClimateGaugesLakeWatershed BoundaryStream 0.02.04.06.08.010.012.014.016.018.020.00100200300400500600700Temperature(DegC)MonthlyPrecipitation(mm)MeanMonthlyTemperatureandPrecipitationforAlouetteRiversWatershedGaugesPittPolder(1106180,Elevation5m)1951Ͳ2007MonthlyPrecipitation(Min,MeanandMax)MonthlyTemperatureFigure11 0.02.04.06.08.010.012.014.016.018.020.00100200300400500600700Temperature(DegC)MonthlyPrecipitation(mm)MeanMonthlyTemperatureandPrecipitationforAlouetteRiversWatershedGaugesHaneyUBCRFAdmin(1103332,Elevation147m)1961Ͳ2008MonthlyPrecipitation(Min,MeanandMax)MonthlyTemperatureFigure12 050100150200250300350400TotalPrecipitation(mm)AnnualMaximumPrecipitationEventsPittPolder(1106180,Elevation5m)1ͲDayPrecipitation3ͲDayPrecipitation5ͲDayPrecipitationFigure13 050100150200250300350TotalPrecipitation(mm)AnnualMaximumPrecipitationEventsHaneyUBCRFAdmin(1103332,Elevation147m)1ͲDayPrecipitation3ͲDayPrecipitation5ͲDayPrecipitationFigure14 012345NumberofEventsExceeding2ͲYear,1ͲDayPrecipitationNumberRainyDayEventsbyYearPittPolderHaneyUBCRFNodataavailableFigure15 Ͳ800Ͳ600Ͳ400Ͳ2000200400600800AnnualPrecipitationͲDeviationfromMean(mm)AnnualandWinterPrecipitationDeviationfromMeanatPittPolderGauge1952Ͳ2006AnnualWinterFigure16 Ͳ800Ͳ600Ͳ400Ͳ20002004006008001000AnnualPrecipitationͲDeviationfromMean(mm)AnnualandWinterPrecipitationDeviationfromMeanatHaneyUBCRFGauge1962Ͳ2006AnnualWinterFigure17 Figure18:TemperatureTrendsunderClimateChange 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.0 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090Temperature(DegreesC)MeanAnnualTemperature TrendsUnderClimateChange MapleRidge,BC CGCM_A2x CGCM_B2x HADCM3_Adx 25 26 27 28 29 30 31 32 33 34 35 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090Temperature(DegreesC)SummerMeanMaximumTemperature TrendsUnderClimateChange MapleRidge,BC CGCM_A2x CGCM_B2x HADCM3_Adx Ͳ3.0 Ͳ2.5 Ͳ2.0 Ͳ1.5 Ͳ1.0 Ͳ0.5 0.0 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090Temperature(DegreesC)WinterMeanMinimumTemperature TrendsUnderClimateChange MapleRidge,BC CGCM_A2x CGCM_B2x HADCM3_Adx Figure19a:PrecipitationTrendsunderClimateChange 840 860 880 900 920 940 960 980 1000 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090Precipitation (mm)Mean Annual Precipitation Trends Under Climate Change Maple Ridge, BC CGCM_A2x CGCM_B2x HADCM3_Adx 0 20 40 60 80 100 120 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090Precipitation as Snow (mm)Annual Precipitation as Snow Trends Under Climate Change Maple Ridge, BC CGCM_A2x CGCM_B2x HADCM3_Adx 160 165 170 175 180 185 190 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090Precipitation (mm)Spring Monthly Precipitation Trends Under Climate Change Maple Ridge, BC CGCM_A2x CGCM_B2x HADCM3_Adx Figure19b:PrecipitationTrendsunderClimateChange 0 20 40 60 80 100 120 140 160 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090Precipitation (mm)Summer Monthly Precipitation Trends Under Climate Change Maple Ridge, BC CGCM_A2x CGCM_B2x HADCM3_Adx 210 215 220 225 230 235 240 245 250 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090Precipitation (mm)Fall Monthly Precipitation Trends Under Climate Change Maple Ridge, BC CGCM_A2x CGCM_B2x HADCM3_Adx 210 215 220 225 230 235 240 245 250 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090Precipitation (mm)Winter Monthly Precipitation Trends Under Climate Change Maple Ridge, BC CGCM_A2x CGCM_B2x HADCM3_Adx 0.01.02.03.04.05.06.0Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecFlow(m3/s)MeanMonthlyFlowsforNorthAlouetteRiverat232ndStreet1911to2008Mean Monthly FlowsMean Annual DischargeFigure20 02040608010012011223344556677889100111122133144155166177188199210221232243254265276287298309320331342353364Flow(m3/s)JulianDaySummaryAnnualHydrographsforNorthAlouetteRiverat232ndStreet1911to2008AverageMinimumMaximum5thPercentile95thPercentileFigure21 0.01.02.03.04.05.06.07.08.0Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecFlow(m3/s)MeanMonthlyFlowsforSouthAlouetteRiverat232ndStreet1985toPresentMeanMonthlyFlowsMeanAnnualDischargeFigure22 02040608010012014011223344556677889100111122133144155166177188199210221232243254265276287298309320331342353364Flowm3/sJulianDaySummaryAnnualHydrographsforSouthAlouetteRiverat232ndStreet1985toPresentAverageMinimumMaximum5thPercentile95thPercentileFigure23 051015202530354045Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecFlow(m3/s)MeanMonthlyFlowsforSouthAlouetteRiveraboveAlouetteLake1984to2010MeanMonthlyFlowsMeanAnnualDischargeFigure24 05010015020025030035040045050011223344556677889100111122133144155166177188199210221232243254265276287298309320331342353364Flow (m3/s)JulianDaySummaryAnnualHydrographsforSouthAlouetteRiveraboveAlouetteLake1984to2010AverageMinimumMaximum5thPercentile95thPercentileFigure25 0501001502002501910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010Flow(m3/s)DailyFlowonNorthandSouthAlouetteRivers1911Ͳ200808MH00508MH006AlouetteDamConstructedAlouetteDamModifiedSouthAlouetteNorthAlouetteFigure26 0204060801001201401601801900 1920 1940 1960 1980 2000 2020Flow(m3/s)AnnualPeakDailyandInstantaneousFlowsNorthAlouetteRiverPeakAnnualInstantaneousFlowPeakAnnualDailyFlowLinear(PeakAnnualInstantaneousFlow)Linear(PeakAnnualDailyFlow)Figure27 01020304050607080901001900 1920 1940 1960 1980 2000 2020Flow(m3/s)AnnualPeakDailySeasonalFlowsNorthAlouetteRiverPeakDailySummerFlowPeakDailyWinterFlowLinear(PeakDailySummerFlow)Linear(PeakDailyWinterFlow)Figure28 012345191219151918192119241927193019331936193919421945194819511954195719601963196619691972197519781981198419871990199319961999200220052008NumberofDaysNumberofHighFlowDaysbyYearNorthAlouetteRiverNumberDayswithFlow>40m3/sNodataavailableFigure29 EŽƌƚŚůŽƵĞƚƚĞĞƐŝŐŶŝƐĐŚĂƌŐĞ,LJĚƌŽŐƌĂƉŚƐǁŝƚŚůŝŵĂƚĞŚĂŶŐĞ/ŵƉĂĐƚƐFigure30 STELLASystemsModelofAlouetteReservoirandDam–OverviewFigure3ϭ 0100200300400500600Discharge(m3/s)Time(Hours)DesignDischargeHydrographstoSouthAlouetteRiverB.1Ͳ2ͲYearFlowB.2Ͳ5ͲYearFlowB.3Ͳ10ͲYearFlowB.4Ͳ25ͲYearFlowB.5Ͳ50ͲYearFlowB.6Ͳ100ͲYearFlowB.7Ͳ200ͲYearFlowFigure3Ϯ 0.00.20.40.60.81.01.21.41.61.82.0024487296120 144 168 192216 240ZĂƚŝŽŽĨYŝͬYĚTime(Hours)HydrographShapeSensitivity48HourTriangularHydrograph72HourTriangularHydrograph120HourTriangularHydrograph48HourPeakyHydrographFigure3ϯ 0%20%40%60%80%100%120%EntireWatershedSubbasin1ͲAlouetteRiverSubbasin2ͲBlaneyCreekSubbasin3ͲFentonRoadSloughSubbasin4ͲMcKennyCreekSubbasin5ͲNorthAlouetteRiverHypsometricCurvesforTributaryWatershedsElevation(m)Figure3ϰ ^ƚĂŐĞͲŝƐĐŚĂƌŐĞZĂƚŝŶŐƵƌǀĞĨŽƌs'ĂƵŐĞĂƚWĞĚĞƐƚƌŝĂŶƌŝĚŐĞEŽƌƚŚůŽƵĞƚƚĞZŝǀĞƌ&ůŽǁ(mϯͬƐ)Figure3ϱElevation(m) ^ƚĂŐĞͲŝƐĐŚĂƌŐĞZĂƚŝŶŐƵƌǀĞĨŽƌDĂƉůĞZŝĚŐĞ'ĂƵŐĞĂƚϮϮϰƚŚ^ƚƌĞĞƚEŽƌƚŚůŽƵĞƚƚĞZŝǀĞƌ&ůŽǁ(mϯͬƐ)Figure3ϲElevation(m) EŽƌƚŚůŽƵĞƚƚĞZŝǀĞƌEŽǀĞŵďĞƌϮϬϭϰ/ŶĨůŽǁ,LJĚƌŽŐƌĂƉŚFigureϯϳ EŽƌƚŚůŽƵĞƚƚĞZŝǀĞƌ:ĂŶƵĂƌLJϮϬϭϱ/ŶĨůŽǁ,LJĚƌŽŐƌĂƉŚFigureϯϴ 0100020003000 4000500060007000 800090 00100001100012000 0100020003000 400050006000700080009000 10000110 00120001300014000 150001600017000 1800019000 North Alouette RiverSouth Alouette Riveru/s North Alouette Boundaryu/s South Alouette Boundaryd/s Boundary232 ST ABERNETHY WAY128 AVEGOLDEN EARS WAYLOUGHEED HWY123 AVE256 ST 227 ST NEAVES RD224 ST 240 ST 216 ST 203 ST DEWDNEY TRUNK RDHARRIS RD132 AVEMCNEIL RDBlaney CreekFenton SloughNA Local InflowsMcKenny Creek +SA Local InflowsAM & GDL, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_AM_Fig39_MIKE11 Model Network.mxdJob: 300349FIGURE 39Date: 30-NOV-2015MIKE11 Model NetworkALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSISDATA SOURCES:- Esri World Imagery- Esri World Street MapCoordinate System: NAD 1983 UTM ZONE 10NUnits: METRESSCALE - 1:45,000±0 500 1,000 1,500MPoint SourceMIKE11 BoundaryCross SectionMIKE11 Model Network EŽǀĞŵďĞƌϮϬϭϰĂůŝďƌĂƚŝŽŶǀĞŶƚDŽĚĞů/ŶĨůŽǁŽƵŶĚĂƌLJŽŶĚŝƚŝŽŶƐFigureϰϬ EŽǀĞŵďĞƌϮϬϭϰĂůŝďƌĂƚŝŽŶǀĞŶƚDŽĚĞůtĂƚĞƌ>ĞǀĞůŽƵŶĚĂƌLJŽŶĚŝƚŝŽŶƐFigureϰϭ EŽǀĞŵďĞƌϮϬϭϰĂůŝďƌĂƚŝŽŶĂƚEŽƌƚŚůŽƵĞƚƚĞϮϯϮŶĚ^ƚƌĞĞƚƌŝĚŐĞFigureϰϮ EŽǀĞŵďĞƌϮϬϭϰĂůŝďƌĂƚŝŽŶĂƚEŽƌƚŚůŽƵĞƚƚĞs'ĂƵŐĞFigureϰϯ EŽǀĞŵďĞƌϮϬϭϰĂůŝďƌĂƚŝŽŶĂƚEŽƌƚŚůŽƵĞƚƚĞĂƚϮϮϰƚŚ^ƚƌĞĞƚƌŝĚŐĞ;DĂƉůĞZŝĚŐĞ'ĂƵŐĞͿFigureϰϰ EŽǀĞŵďĞƌϮϬϭϰĂůŝďƌĂƚŝŽŶĂƚ^ŽƵƚŚůŽƵĞƚƚĞĂƚϮϯϮŶĚ^ƚƌĞĞƚƌŝĚŐĞ;t^'ĂƵŐĞͿFigureϰϱ EŽǀĞŵďĞƌϮϬϭϰĂůŝďƌĂƚŝŽŶĂƚůŽƵĞƚƚĞZŝǀĞƌƐŽŶĨůƵĞŶĐĞ;WŝƚƚDĞĂĚŽǁƐ'ĂƵŐĞͿFigureϰϲ :ĂŶĂƵƌLJϮϬϭϱsĂůŝĚĂƚŝŽŶǀĞŶƚDŽĚĞů/ŶĨůŽǁŽƵŶĚĂƌLJŽŶĚŝƚŝŽŶƐFigureϰϳ :ĂŶƵĂƌLJϮϬϭϱsĂůŝĚĂƚŝŽŶǀĞŶƚtĂƚĞƌ>ĞǀĞůŽƵŶĚĂƌLJŽŶĚŝƚŝŽŶƐFigureϰϴ :ĂŶƵĂƌLJϮϬϭϱsĂůŝĚĂƚŝŽŶĂƚEŽƌƚŚůŽƵĞƚƚĞϮϯϮŶĚ^ƚƌĞĞƚƌŝĚŐĞFigureϰϵ :ĂŶƵĂƌLJϮϬϭϱsĂůŝĚĂƚŝŽŶĂƚEŽƌƚŚůŽƵĞƚƚĞs'ĂƵŐĞFigureϱϬ :ĂŶƵĂƌLJϮϬϭϱsĂůŝĚĂƚŝŽŶĂƚEŽƌƚŚůŽƵĞƚƚĞĂƚϮϮϰƚŚ^ƚƌĞĞƚƌŝĚŐĞ;DĂƉůĞZŝĚŐĞ'ĂƵŐĞͿFigureϱϭ :ĂŶƵĂƌLJϮϬϭϱsĂůŝĚĂƚŝŽŶĂƚ^ŽƵƚŚůŽƵĞƚƚĞĂƚϮϯϮŶĚ^ƚƌĞĞƚƌŝĚŐĞ;t^'ĂƵŐĞͿFigureϱϮ :ĂŶƵĂƌLJϮϬϭϱsĂůŝĚĂƚŝŽŶĂƚůŽƵĞƚƚĞZŝǀĞƌƐΖŽŶĨůƵĞŶĐĞ;WŝƚƚDĞĂĚŽǁƐ'ĂƵŐĞͿFigureϱϯ 132 AVE216 ST224 ST124 AVENEAVES RD232 ST227 ST123 AVE128 AVE210 STABERNETHY WAY132 AVE128 AVEAM & GDL, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_AM_Fig54_MIKE21 Model Domain and Mesh.mxdJob: 300349FIGURE 54Date: 30-NOV-2015MIKE21 Mesh SurfaceALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSISDATA SOURCES:- Esri World Imagery- Esri World Street MapCoordinate System: NAD 1983 UTM ZONE 10NUnits: METRESSCALE - 1:20,000±5RDGVLink (MIKE21/MIKE11)MIKE21 BoundaryInternal WeirDikeMesh0 200 400 600 800M 128 AVE132 AVEABERNETHY WAY210 ST128 AVE227 ST232 STNEAVES RD224 ST216 ST132 AVEAM & GDL, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_AM_Fig55_MIKE21 Model Roughness.mxdJob: 300349FIGURE 55Date: 30-NOV-2015MIKE21 Model RoughnessALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSISDATA SOURCES:- Esri World Imagery- Esri World Street MapCoordinate System: NAD 1983 UTM ZONE 10NUnits: METRESSCALE - 1:20,000±Link (MIKE21/MIKE11)MIKE21 BoundaryModel Roughness12.516.720.025.00 200 400 600 800M Maps 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodDepth1.mxdDikeStudy Area ExtentsDepth (m)0 to 0.5Most houses are dry; walking in moving water or driving ispotentially dangerous; basements and undergroundparking may be flooded, potentially causing evacuation.0.5 to 1.0Water on ground floor; basements and underground parkingflooded, potentially causing evacuation; electricity failed;vehicles are commonly carried off roadways.1.0 to 2.0Ground floor flooded; residents evacuate.2.0 to 5.0First floor and often roof covered by water; residents evacuate.> 5.0; RiverFirst floor and often roof covered by water;residents evacuate.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 1Date: 08-DEC-2015FLOOD DEPTHSALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS2-YEAR 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodDepth1.mxdDikeStudy Area ExtentsDepth (m)0 to 0.5Most houses are dry; walking in moving water or driving ispotentially dangerous; basements and undergroundparking may be flooded, potentially causing evacuation.0.5 to 1.0Water on ground floor; basements and underground parkingflooded, potentially causing evacuation; electricity failed;vehicles are commonly carried off roadways.1.0 to 2.0Ground floor flooded; residents evacuate.2.0 to 5.0First floor and often roof covered by water; residents evacuate.> 5.0; RiverFirst floor and often roof covered by water;residents evacuate.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 2Date: 08-DEC-2015FLOOD DEPTHSALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS5-YEAR 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodDepth1.mxdDikeStudy Area ExtentsDepth (m)0 to 0.5Most houses are dry; walking in moving water or driving ispotentially dangerous; basements and undergroundparking may be flooded, potentially causing evacuation.0.5 to 1.0Water on ground floor; basements and underground parkingflooded, potentially causing evacuation; electricity failed;vehicles are commonly carried off roadways.1.0 to 2.0Ground floor flooded; residents evacuate.2.0 to 5.0First floor and often roof covered by water; residents evacuate.> 5.0; RiverFirst floor and often roof covered by water;residents evacuate.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 3Date: 08-DEC-2015FLOOD DEPTHSALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS10-YEAR 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodDepth1.mxdDikeStudy Area ExtentsDepth (m)0 to 0.5Most houses are dry; walking in moving water or driving ispotentially dangerous; basements and undergroundparking may be flooded, potentially causing evacuation.0.5 to 1.0Water on ground floor; basements and underground parkingflooded, potentially causing evacuation; electricity failed;vehicles are commonly carried off roadways.1.0 to 2.0Ground floor flooded; residents evacuate.2.0 to 5.0First floor and often roof covered by water; residents evacuate.> 5.0; RiverFirst floor and often roof covered by water;residents evacuate.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 4Date: 08-DEC-2015FLOOD DEPTHSALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS25-YEAR 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodDepth1.mxdDikeStudy Area ExtentsDepth (m)0 to 0.5Most houses are dry; walking in moving water or driving ispotentially dangerous; basements and undergroundparking may be flooded, potentially causing evacuation.0.5 to 1.0Water on ground floor; basements and underground parkingflooded, potentially causing evacuation; electricity failed;vehicles are commonly carried off roadways.1.0 to 2.0Ground floor flooded; residents evacuate.2.0 to 5.0First floor and often roof covered by water; residents evacuate.> 5.0; RiverFirst floor and often roof covered by water;residents evacuate.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 5Date: 08-DEC-2015FLOOD DEPTHSALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS50-YEAR 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodDepth1.mxdDikeStudy Area ExtentsDepth (m)0 to 0.5Most houses are dry; walking in moving water or driving ispotentially dangerous; basements and undergroundparking may be flooded, potentially causing evacuation.0.5 to 1.0Water on ground floor; basements and underground parkingflooded, potentially causing evacuation; electricity failed;vehicles are commonly carried off roadways.1.0 to 2.0Ground floor flooded; residents evacuate.2.0 to 5.0First floor and often roof covered by water; residents evacuate.> 5.0; RiverFirst floor and often roof covered by water;residents evacuate.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 6Date: 08-DEC-2015FLOOD DEPTHSALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS100-YEAR 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodDepth1.mxdDikeStudy Area ExtentsDepth (m)0 to 0.5Most houses are dry; walking in moving water or driving ispotentially dangerous; basements and undergroundparking may be flooded, potentially causing evacuation.0.5 to 1.0Water on ground floor; basements and underground parkingflooded, potentially causing evacuation; electricity failed;vehicles are commonly carried off roadways.1.0 to 2.0Ground floor flooded; residents evacuate.2.0 to 5.0First floor and often roof covered by water; residents evacuate.> 5.0; RiverFirst floor and often roof covered by water;residents evacuate.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 7Date: 08-DEC-2015FLOOD DEPTHSALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS200-YEAR 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodHazard1.mxdDikeStudy Area ExtentsHazard Rating (m*m/s)< 0.75Low: Caution - Flood zone with shallow flowing wateror deep standing water.0.75 to 1.25Moderate: Dangerous for some (e.g. children) - Danger: flood zone with deep or fast flowing water.1.25 to 2.5Significant: Dangerous for most people - Danger: flood zone with deep fast flowing water.> 2.5Extreme: Dangerous for all - Extreme danger: flood zone with deep fast flowing water.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 8Date: 08-DEC-2015FLOOD HAZARDALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS2-YEAR 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodHazard1.mxdDikeStudy Area ExtentsHazard Rating (m*m/s)< 0.75Low: Caution - Flood zone with shallow flowing wateror deep standing water.0.75 to 1.25Moderate: Dangerous for some (e.g. children) - Danger: flood zone with deep or fast flowing water.1.25 to 2.5Significant: Dangerous for most people - Danger: flood zone with deep fast flowing water.> 2.5Extreme: Dangerous for all - Extreme danger: flood zone with deep fast flowing water.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 9Date: 08-DEC-2015FLOOD HAZARDALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS5-YEAR 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodHazard1.mxdDikeStudy Area ExtentsHazard Rating (m*m/s)< 0.75Low: Caution - Flood zone with shallow flowing wateror deep standing water.0.75 to 1.25Moderate: Dangerous for some (e.g. children) - Danger: flood zone with deep or fast flowing water.1.25 to 2.5Significant: Dangerous for most people - Danger: flood zone with deep fast flowing water.> 2.5Extreme: Dangerous for all - Extreme danger: flood zone with deep fast flowing water.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 10Date: 08-DEC-2015FLOOD HAZARDALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS10-YEAR 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodHazard1.mxdDikeStudy Area ExtentsHazard Rating (m*m/s)< 0.75Low: Caution - Flood zone with shallow flowing wateror deep standing water.0.75 to 1.25Moderate: Dangerous for some (e.g. children) - Danger: flood zone with deep or fast flowing water.1.25 to 2.5Significant: Dangerous for most people - Danger: flood zone with deep fast flowing water.> 2.5Extreme: Dangerous for all - Extreme danger: flood zone with deep fast flowing water.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 11Date: 08-DEC-2015FLOOD HAZARDALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS25-YEAR 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodHazard1.mxdDikeStudy Area ExtentsHazard Rating (m*m/s)< 0.75Low: Caution - Flood zone with shallow flowing wateror deep standing water.0.75 to 1.25Moderate: Dangerous for some (e.g. children) - Danger: flood zone with deep or fast flowing water.1.25 to 2.5Significant: Dangerous for most people - Danger: flood zone with deep fast flowing water.> 2.5Extreme: Dangerous for all - Extreme danger: flood zone with deep fast flowing water.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 12Date: 08-DEC-2015FLOOD HAZARDALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS50-YEAR 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodHazard1.mxdDikeStudy Area ExtentsHazard Rating (m*m/s)< 0.75Low: Caution - Flood zone with shallow flowing wateror deep standing water.0.75 to 1.25Moderate: Dangerous for some (e.g. children) - Danger: flood zone with deep or fast flowing water.1.25 to 2.5Significant: Dangerous for most people - Danger: flood zone with deep fast flowing water.> 2.5Extreme: Dangerous for all - Extreme danger: flood zone with deep fast flowing water.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 13Date: 08-DEC-2015FLOOD HAZARDALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS100-YEAR 132 AVE224 ST128 AVE227 STABERNETHY WAY232 ST128 AVESouth Alouette RiverNorth Alouette RiverTrethewey Dike mayfail and area behindthe dike should be considered to be within floodplain.(Dike breachingwas not modelled.)T R E T H E W E Y D I K E 132 Ave acts as a dikeMSN, \\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Fig_FloodHazard1.mxdDikeStudy Area ExtentsHazard Rating (m*m/s)< 0.75Low: Caution - Flood zone with shallow flowing wateror deep standing water.0.75 to 1.25Moderate: Dangerous for some (e.g. children) - Danger: flood zone with deep or fast flowing water.1.25 to 2.5Significant: Dangerous for most people - Danger: flood zone with deep fast flowing water.> 2.5Extreme: Dangerous for all - Extreme danger: flood zone with deep fast flowing water.Potentially wetted area behind Trethewey DikeDATA SOURCES: 2011 orthoimagery supplied by City of Maple Ridge. Dike mapping supplied by City of Maple Ridge.±0200400MSCALE - 1:10,000Coordinate System: NAD 1983 UTM ZONE 10NUnits: METRESJob: 300349MAP 14Date: 08-DEC-2015FLOOD HAZARDALOUETTE RIVERSADDITIONALFLOODPLAIN ANALYSIS200-YEAR Flood Plain Map !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")")")")128 AVE227 ST232 ST232 ST224 ST132 AVEABERNETHY WAY224 ST128 AVE132 AVETrethewey Dike mayfail and area behindthe dike should beconsidered to bewithin floodplain.(Dike breachingwas not modelled.)TRETHEW E Y D I K E NorthAlouetteRiverSouthAlouetteRiver132 Ave acts as a dikeALOUETTE RIVERNEAR HANEY (08MH005)NORTH ALOUETTE RIVERAT 232ND STREET (08MH006)132 Ave & 224 Stapprox. 500m d/s of 232nd St.,near 23088 132nd Ave.9.00 8.87 9.00 8.87 7.00 6.87 7.00 6.87 6.00 5.77 8.00 7.93 8.00 7.89 10.00 9.79 10.00 9.82 21.00 20.81 20.00 19.32 20.00 19.73 19.00 18.34 19.00 18.74 18.00 17.54 18.00 17.81 17.00 16.44 17.00 16.79 16.00 15.40 14.00 13.65 13.00 12.69 13.00 12.78 12.00 11.71 12.00 11.77 11.00 10.73 11.00 10.80 15.00 14.45 16.00 15.78 14.00 13.79 15.00 14.79 STUDYLIMITSTUDYLIMITSTUDY LIMITSTUDY LIMIT115 10 095 908580 70 65 60 55 4580 45115 756055504540 353065505551510510 1550605550535 5525 51151 10 105025205130125 55252010105585807525 10 10 55305 510103530 25 51510 5 3515513512055251054540 25107065 555 1010101030 2555 530255105105255 55 555555105555555 5555551015520 20 2051510 201520102015 51520 1515 2010 205 15 51055 5515102015 20 105155201555520551520101510 20515 105105\\mainfile-van\Projects\Active\300349 Maple Ridge\GIS\300349_MSN_Map_Floodplain1.mxdCoordinate System: NAD 1983 UTM ZONE 10NUnits: METRESSCALE - 1:5,000±0 100 200 300 400Mwww.nhcweb.com30034919-JAN-2016200-YEAR FLOOD EXTENTSINCLUDING FREEBOARDALOUETTE RIVERS ADDITIONAL FLOODPLAIN ANALYSISACMEngineerGISReviewerJob NumberDateMSNMMFlood Construction Level (FCL)1 in 25 yr Flood Level (+ 0.6 m freeboard)All elevations are in metres (GSC).Hydrometric Stations")Water Survey of Canada")City of Maple Ridge")Alouette Valley AssociationContours1 m interval5 m interval!!Study Limit!FCL - Thalweg IntersectionFlood Construction Level IsolineFloodplain Areas1 in 200 yr Flood Limit, including 0.6m freeboard (FCL)Potentially wetted area behind Trethewey DikeRiver1991 Provincial Designated 200 yr Flood LimitDisclaimer:This document has been prepared by Northwest Hydraulic Consultants Ltd. inaccordance with generally accepted engineering and geoscience practices and isintended for the exclusive use and benefit of the City of Maple Ridge and theirauthorized representatives for specific application to the Alouette Rivers’ Assessmentand Floodplain Analysis Project. The contents of this document are not to be reliedupon or used, in whole or in part, by or for the benefit of others without specific writtenauthorization from Northwest Hydraulic Consultants Ltd. No other warranty, expressedor implied, is made.Northwest Hydraulic Consultants Ltd. and its officers, directors, employees, andagents assume no responsibility for the reliance upon this document or any of itscontents by any parties other than the City of Maple Ridge.1.2.3.4.5.6.Dike mapping supplied by City of Maple Ridge.Hydrometric station locations acquired from Water Survey of Canada and City ofMaple Ridge.1991 provincial floodplain boundary acquired from Data BC, digitized by BC Ministryof Environment from 1:5,000 scale floodplain maps of the Alouette and North AlouetteRivers (file 00-0200-S.2).Contours created by NHC based on 2014 Lidar data supplied by City of Maple Ridge.2011 orthophoto supplied by City of Maple Ridge.Index basemap from National Geographic and Esri.Data Sources:1.NHC (2016). North Alouette and South Alouette Rivers Assessment and FloodplainAnalysis, Phase 2 – Technical Investigations (Final Report). Report prepared for theCity of Maple Ridge.References:1.2.3.4.5.6.7.8.9.10.This map delineates the potential for flooding under conditions caused by a 200-yearreturn period event as described in NHC (2016). To account for future climate changeimpacts, the 200-year peak flow based on historic analysis was increased by 10% onall unregulated flow sources. No climate change allowance was made for flowsreleased from the Alouette Reservoir, as these are controlled by BC Hydro instead ofnatural processes.A freeboard allowance (margin of safety) of 0.6 m is included in the flood levels shownto account for various sources of uncertainty in the model inputs and parameters.LiDAR data surveyed in 2014 was used to create a Digital Elevation Model (DEM) forthe study area. The DEM surface was modified to include ground survey data for (1)the 132 Avenue bridge on the North Alouette River, (2) the 224 Street bridge on theNorth Alouette River, and (3) in channel surveys for the North and South AlouetteRivers. The maps depict flood levels based on ground conditions represented in thisDEM. Any changes to ground/channel elevations, land use or buildings from thoseincluded in the model will affect the flood levels and render site-specific informationobsolete.The model geometry was kept fixed although variations (erosion, degradation oraggradation) may occur during a flood event and/or over time. The maps do notprovide information on site-specific hazards such as land erosion or sudden shifts inthe water courses. Channel obstructions such as log-jams, local storm water inflows,groundwater or other land drainage can cause flood levels to exceed those indicatedon the map. Lands adjacent to a floodplain may be subject to flooding from tributarystreams that are not indicated on the maps.The flood levels are based on water surface profiles simulated using an integratedone- and two-dimensional hydrodynamic model developed by NHC (2016) using theMIKE Flood software. Model roughness values were initially assigned based ontypical channel and overbank resistance values; then calibrated to a flood event in2014 and validated to a flood in 2015.The Tretheway Dike does not meet provincial diking standards and would likelybreach at some flow less than the 200-year flood. The area behind the dike isconsidered part of the floodplain although not specifically mapped due to the absenceof breach modelling.The accuracy of simulated flood levels is limited by the reliability and extent of thewater level data and flow magnitude used for calibrating the model.The accuracy of the location of the floodplain boundary is limited by the accuracy ofthe DEM, model boundary conditions and model parameters. Locally raised areashave not been mapped in the floodplain extents.A Qualified Professional must be consulted for site-specific engineering analysis.Industry best practices were followed to generate the flood extent maps. However,actual flood levels and extents may vary from those shown and Northwest HydraulicConsultants Ltd. (NHC) does not assume any liability for such variations.Notes: 1 City of Maple Ridge TO: Her Worship Mayor Nicole Read MEETING DATE: May 2, 2016 and Members of Council FILE NO: CDPR-0640-30 FROM: Chief Administrative Officer MEETING: COW SUBJECT: Contract Award for Mowing Services – 2016 EXECUTIVE SUMMARY: A tender for bids from qualified companies for the provision of mowing and trimming services was issued in 2014 and, Horizon Landscape Contractors was the low bid in the invitation to tender #ITT- PL14-67. The tender call asked vendors to provide two options: - Option “A” for mowing and trimming services for Maple Ridge and Pitt Meadows based on the previous mowing contract, and - Option “B” with pricing for mowing of parks sites that were being completed by parks staff at that time. Option “A” was approved for 2015, however staff are now recommending Option “B” which includes all of the option “A” and “B” sites for the 2016 mowing season. Option ”B” was asked for because staff wished to review the cost effectiveness of completing this work with one of the City’s existing large mowers; the mower was approaching the end of its useful life and would need to be replaced. The analysis in this case confirmed that this additional mowing could be completed by contract for less than the annual cost of a replacement mower. The review of the cost effectiveness of the mower also coincided with the review of the Parks Department structure. It demonstrated that the outsourcing of the mowing and trimming work would create an opportunity to re-assign a staff member to other priority activities that will continue to be needed after the October 2016 exit from the Joint Parks and Leisure Services agreement. It is important to note that the outsourcing of this mowing work will not negatively affect current staffing levels. RECOMMENDATION: That the Option “B” proposal from Horizon Landscape Contractors be approved for the sum of $167,065 plus $2,240.52 for new 2016 sites recently added to the contract, plus a contingency amount of $5,000 for other mowing services that may be required up to October 31, 2016 only. DISCUSSION: a)Background Context: The invitation to tender #ITT-PL14-67 requested two pricing options anticipating that the City may wish to consider permanently retiring one of its large mowers as a cost saving initiative. A thorough evaluation has confirmed that it would be more cost effective not to replace one of the large mowers and instead, reassign the staff member involved in this specific task to assist with other priority tasks. The costs to outsource this work are comparable to the annual cost of just the lawn mower, not including staff time. 1151 2 b) Desired Outcome: To ensure the provision of municipal mowing services in a cost effective manner. c) Strategic Alignment This initiative is consistent with the City’s business planning expectations to look for opportunities to be more efficient and effective in day-to-day operations. d) Citizen/Customer Implications: There is no customer service implications anticipated and the mowing will be completed with the same frequency as it was prior to this change. e) Business Plan/Financial Implications: There are no financial implications anticipated as staff will be reassigned to other parks maintenance tasks. This contract will be re-evaluated again in 2017 when it is anticipated that Pitt Meadows sites will be removed from the contract. f) Alternatives: The City could replace the mower at the end if it’s useful life, which is now. Staff does not recommend this because the significant savings will support the future operating model for a Maple Ridge Parks and Facilities Department, without incurring a negative impact on either services to the community or the staffing compliment. CONCLUSIONS: The review of equipment replacements and the provision of services to our residents have in this case provided a very positive outcome regarding cost savings in mowing services that assisted in developing an exit strategy from the current Joint Leisure Services Agreement. This will allow us to continue to provide cost effective mowing, trimming and other park maintenance services within the planned City of Maple Ridge operating budget. “Original signed by Wendy McCormick for” Prepared by: David Boag Director, Parks and Facilities “Original signed by Trevor Thompson” Reviewed by: Trevor Thompson Manager, Financial Planning “Original signed by Kelly Swift” Approved by: Kelly Swift General Manager, Community Development, Parks and Recreation Services “Original signed by Ted Swabey” Concurrence: E.C. Swabey Chief Administrative Officer db Attachments; Contract Agreement I Page 1 of 31 CITY OF MAPLE RIDGE INVITATION TO TENDER # ITT-PL14-67 Parks Grass Mowing and Trimming November 24, 2014 City of Maple Ridge 11995 Haney Place Maple Ridge, BC V2X 6A9 INSTRUCTIONS TO BIDDERS Page 2 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Invitation The City of Maple Ridge, on behalf of the Maple Ridge/Pitt Meadows Parks & Leisure Services Commission, is inviting tender submissions for the provision of parks grass mowing and trimming. Sealed tenders will be received on or before 2:00 P.M. Local Time, December 17, 2014 at the following address City of Maple Ridge Municipal Hall 11995 Haney Place, 1st Floor Reception Desk Maple Ridge, BC, V2X 6A9 Attn: Nichole Walsh Tenders received after the requested time of receipt may or may not be considered. There will be no public opening for this Invitation to Tender (ITT). No information will be disclosed from the time of tender opening to the time a contract is awarded. Once a contract has been awarded the name(s) of the successful Bidder(s) will be available to anyone upon request. All submissions become the property of the City of Maple Ridge and are subject to the Freedom of Information and Privacy Legislation. Tender documents are available for download from BCBid at www.bcbid.bc.ca. Tenders transmitted by facsimile machine or electronic mail will not be considered. Questions regarding the information contained herein should be directed in writing to: Nichole Walsh – Purchasing Supervisor, Tel: 604-476-2610 Fax: 604-466-4328 Email: nwalsh@mapleridge.ca. Tender Submission A bidder’s basic submission should conform strictly to the requirements of the Invitation to Tender documents and may also submit an alternative which is superior to or less costly than the basic submission. Terminology such as, “must”, “shall”, “should”, or “may” identify the criticality of requirement. The terms “must”, and “shall”, are mandatory terms. “Should” and “may” are preferred, but less desirable and may affect the overall rating of the Tender submission. The Form of Tender should be submitted on the forms provided and are requested to be received as per above in a sealed envelope clearly marked on the outside “ITT-PL14-67 Park Grass Mowing and Trimming.” The legal name and address of the Bidder is to be used when signing the tender documents. All costs incurred by bidders in the preparation and presentation of their tender will be at their own expense. INSTRUCTIONS TO BIDDERS Page 3 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Please note that it is the responsibility of the bidder to occasionally check the BCBID website to ensure they receive addendums that may be posted there. Registration of Intent to Respond Bidders should complete and IMMEDIATELY return the form titled “Registration of Intent to Respond” appearing at the end of this section. Failure to do so may result in your company not receiving addenda and other correspondence related to this Invitation to Tender. Site Visits and Mandatory Information Meeting It is the bidder’s responsibility to view the site(s) to determine the existing conditions, dimensions, and limitations. The bidder will rely entirely upon his/her own judgment in submitting a tender, and will include in the tender submission a sum sufficient to cover all items required for the types of work specified. The bidder will be responsible to investigate the project requirements and complete the works to the satisfaction of the City. In submitting a tender the bidder confirms he/she has viewed the work sites. A list of work locations and addresses, complete with mowing and trimming frequencies, and including details pertaining to the areas is attached to the tender as “Pricing Schedule Option A” and “Pricing Schedule Option B”. Due to the number of sites the bidders are requested to view the locations on their own. Contractors are encouraged to: view all sites in order listed on the OPTION B pricing sheet (as all locations are included for Option B); consult both Option A and Option B pricing sheets at each location to understand different scope of service for each Option (however, not ALL sites are requested for Option A); quote pricing as per scope requested per location, Option A and Option B. It is the intention of the City to award the scope of work as outlined in Pricing Schedule Option A as a minimum with the sole discretion of the City to select all, some or none of the enhanced scope of services as outlined in Pricing Schedule Option B. Site Locations: For your convenience a map of Maple Ridge/Pitt Meadows has been attached as “Appendix 1”. Not all sites have been identified – example: boulevards etc. are not identified. A full size drawing of “Appendix 1” Maple Ridge / Pitt Meadows is available from City Hall Reception – Free of Charge. Please refer to ITT-PL14-67 Parks Grass Mowing and Trimming when picking up your map in order to obtain the document without cost. Only (1) one map will be issued per contractor. IMPORTANT: ATTENDANCE IS MANDATORY TO SUBMITTING A BID. A mandatory Information - Question and Answer Session will be held at 1:30 pm on December 11, 2014 at the City of Maple Ridge Municipal Hall located at 11995 Haney Place, Maple Ridge. The Meeting will be held on the first floor in the Blaney Room. Please see Reception upon arrival. INSTRUCTIONS TO BIDDERS Page 4 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Prior to the meeting please notify Nichole Walsh of your attendance at 604-476-2610 or email nwalsh@mapleridge.ca. Vehicle parking is available in the underground parking lot at City Hall. The first hour is free of charge, additional time is available at $0.75 per hour. Any costs associated with attending the Mandatory Question and Answer Session on December 11, 2014 is the sole responsibility of the Contractor. This information session will be the only opportunity Bidders will be able to ask questions to clarify the information, in person, for “Pricing Schedule Option A” and “Pricing Schedule Option B” and to ask any other questions pertaining to the contract. If during this meeting it is deemed that certain locations require a site meeting this can then be arranged. Any subsequent question to be submitted in writing to: nwalsh@mapleridge.ca . It is mandatory that all bidders that intend to submit bids attend the Question and Answer Session and any site meetings that may be arranged. Discrepancies or Omissions Bidders finding discrepancies or omissions in the Invitation to Tender documents, or having any doubts to the meaning or intent of any part thereof, should immediately notify the Purchasing contact in writing, who may send written instructions or explanations to all bidders on record with the City. No responsibility will be accepted for oral instructions. Addenda or correspondence issued during the Invitation to Tender period shall be considered part of this document and become part of the final Contract documents. Except as provided by the above paragraph, no additions or deletions from the contents of these documents will be permitted. Irrevocability of Tender The tender will be irrevocable for a period of ninety (90) days from the Closing Date. Withdrawal of Tenders Tender submissions may be withdrawn personally, by written notice or by fax, provided that Nichole Walsh – Purchasing Supervisor, receives such notice of withdrawal, prior to the preferred time of receipt. Revision of Tender A tender already delivered may only be revised in the following manner, and the revision must be plainly referable to a particular tender. Revisions to tenders already received shall be submitted only by fax or signed letter. The revision must state only the amount of which a figure is to be increased or decreased, or specific directions as to the exclusion or inclusion of particular words. Please note in the case of faxed revisions to tenders, the City of Maple Ridge assumes no responsibilities and the bidder assumes all risks of using faxed communication for revisions. The INSTRUCTIONS TO BIDDERS Page 5 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming faxed transmission must be received in the office of Nichole Walsh prior to preferred time of receipt. Acceptance of Tenders The City may not necessarily accept the lowest priced tender or any tender. At its sole discretion, the City reserves the right to reject any or all tenders received and to accept any tender which it considers advantageous, whether or not it is the lowest priced tender. The City is not under any obligation to award a contract, and reserves the right to terminate the Invitation to Tender process at any time, and to withdraw from discussions with all or any of the Bidders who have responded. The City reserves the right to accept the tender in total or in part, and to waive any minor informalities, irregularities, or technicalities, and to accept the offer deemed most favourable to the City. The City shall not be obligated either to accept or reject any non-compliance within the requirements of this Invitation. The City reserves the right to obtain additional information from the Bidder(s) to clarify the information in their submission, without any obligation to any other bidder. In the event that only one tender is received, the City reserves the right to return the tender unopened. Tenders received after the preferred time of receipt may or may not be considered. Contract Negotiation The City reserves the right to negotiate specific terms of the contract with the short-listed vendor prior to the final award of the contract. Qualifications and Experience All bidders should furnish satisfactory evidence as required to demonstrate that they have the qualifications, experience and equipment to perform all of the work requested in this ITT and that they have sufficient trained and experienced personnel to complete the requirements of the contract to the satisfaction of the City. The City reserves the right to make the final decision, as it sees fit, as to whether or not the Bidders that have responded to this Invitation to Tender can satisfy this requirement. Bidders are requested to provide with their submission a detailed list and description of the equipment to be used should their firm be awarded this contract. This list should include, but is not limited to, motor vehicles, rotary ride on mowers, grass mowers, grass trimmers and trailers. Rotary mowers must be able to pick up leaves and grass clippings upon request, and cut at a minimum height of two (2) inches. Details of all employees’ qualifications and experience are to be provided. INSTRUCTIONS TO BIDDERS Page 6 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Sub-Contractors The bidder is to provide the names of all sub-contractors they plan on using in the work and provide satisfactory evidence that the sub-contractors, also, have the training, experience and ability to complete the work they are called on to perform to the satisfaction of the City. References Bidders should provide with their tenders a complete list of government agencies and/or companies with which you are currently or have recently supplied services that are identical or similar to that which you are proposing in this Invitation to Tender. Please show date of contract, business name; contact name and phone number for each reference. Disposal of Materials Bidders are to show the name and address of the disposal site(s) that they will use for debris from the various locations. All debris is to be disposed of off site and in accordance with all local municipal and provincial laws. Prices Unit prices, in Canadian currency, shall be shown for each unit specified and shall include all applicable charges excluding the GST is to be listed as an extra charge when applicable. The Form of Tender, Pricing Schedule Option A and Pricing Schedule Option B are to be completed in their entirety and any omissions may result in the tender submission being rejected for informality. Prices are to be shown per park, per cut, and/or per trim as outlined on the price sheets. Prices are to include all travel time, labour, equipment and material costs plus an allowance for overhead and profit. The total cost, excluding taxes, for all the sites, is to be entered on Form of Tender as well as on Pricing Schedule Option A sheet and Pricing Schedule Option B sheet. All prices are to be firm for the duration of the contract. It is the intention of the City to award the scope of work as outlined in Pricing Schedule Option A as a minimum with the sole discretion of the City to select all, some or none of the enhanced scope of services outlined in Pricing Schedule Option B. All prices offered must accurately reflect the true cost of work for each location. While it is the intent of the City to award all of the work site locations to one Contractor, the City may deem unit prices for specific locations to be unreasonably high in cost, whereas the City then reserves the right to split the sites and to award a contract to one or more Contractors, or to not award a contract at all. If bid prices exceed the municipal budgeted amount for a Parks Trimming and Mowing contract, all, or portions of the contract, may be cancelled. Insurance Requirements Indicate whether your company can meet the insurance requirements if awarded the contract. You do not need to provide a Certificate of Insurance with your bid. INSTRUCTIONS TO BIDDERS Page 7 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Business Licence and WorkSafeBC Registration Enter your City of Maple Ridge and City of Pitt Meadows business licences and your WorkSafeBC registration numbers in the places provided on the Form of Tender. If you do not have the business licences and/or a WorkSafeBC registration number you will be required to obtain them if awarded the contract. Selection Criteria The selection criteria used in the evaluation of the tenders will include, but not be limited to: prices, qualifications and experience of Bidders and their employees, suitability and condition of equipment, quality based on previous work and references, availability, compliance with prescribed requirements, and any other information that may be requested in this contract document prior to award. Partial Award The City reserves the right to award some, none or all locations listed in this call for Tender. Should the City received only one (1) response to this call for Tender the City reserves to right to return the bid unopened and cancel this tender process. Solicitation of Employees Bidders and their Agents are hereby warned that any attempt to solicit individual members of the Selection Committee, the City Council or the Commission in regard to the award of this contract may jeopardize the favourable consideration of their proposal(s). Failure to Comply If the bidder is awarded the contract tendered, and fails or refuses to enter that contract, the bidder shall without limitation be liable to the City for the difference in the amount of the bidder’s tender under this Invitation to Tender, and the next lowest tender, and the cost incurred by the City in securing a substitute Contractor. Council Approval The awarding of a contract may be subject to the Municipal Council approving the award of a contract to the successful bidder. The City reserves the right to cancel this tender request should Council approval not be received. All awards are subject to budget and available funding. End of Section Instruction to Bidders INSTRUCTIONS TO BIDDERS Page 8 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming City of Maple Ridge #ITT-PL14-67 Park Grass Mowing and Trimming Registration of Intent to Respond To ensure that your company receives any addenda and other correspondence related to the Invitation to Tender, you are asked to return this sheet by email or fax to Nichole Walsh, Purchasing Section, at the following address: nwalsh@mapleridge.ca FAX: 604-466-4328 The following information is required (please print): Company Name: __________________________________________________________________ Address: _________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ Contact Name: ____________________________________________________________________ Title or Position:____________________________________________________________________ EMAIL: ___________________________________________________________________________ Area Code: _______ Phone Number: ___________________ Facsimile _____________________ Date: _____________________________________ SPECIAL TERMS OF THE CONTRACT Page 9 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Special Terms of the Contract The Special Terms appearing in this Section form part of any contract that may be awarded. Definitions Definitions of words and/or terms used in the contract documents will be found in the General Terms of Contract included with the Request for Tender. Nature of Work The work involves the mowing and trimming of lawns within the City of Maple Ridge and City of Pitt Meadows. The work includes the removal of vegetation and litter from the lawns, walkways, trails and parking lot areas. The accumulation of the grass clippings and leaves must be removed when necessary to keep the park attractive and useable and to avoid damage to existing lawns. Grass clippings from any mowing or trimming must be removed from all hard surfaces such as pathways and parking lots etc. at each visit. Management of the Parks The parks are managed by City of Maple Ridge on behalf of the Maple Ridge/Pitt Meadows Parks & Leisure Services Commission. Hereinafter referred to as the “Commission”. Commission’s Representatives The Commission’s Representatives for this project is Randy Van Tunen, Parks Foreman III with the City of Maple Ridge, and is the contact for all technical matters. Nichole Walsh, Purchasing Supervisor is the contact for all contract matters. Contract Term The contract term will be for three (3) years beginning with the 2015 thru to 2017mowing season, With an option to renew the contract for an additional one final mowing season (2017), upon mutual agreement between the City and the Contractor. The maximum contract term will not exceed 48 months. All prices offered must be firm for the duration of this contract. Incremental price changes may be negotiated prior to establishing a contract for the renewal term. The decision to renew the contract rests solely with the City. The City’s decision to extend the contract may be made up to the beginning of the year that includes the following mowing season. Each mowing season typically runs from March 15 to October 31. The Commission Representative reserves the option to delay the start date or to extend the service period of this contract if required. SPECIAL TERMS OF THE CONTRACT Page 10 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Mowing & Trimming Schedule Working with the Commission’s Representative the awarded Contractor will prepare a monthly mowing and trimming schedule based on the frequencies and scope of services listed in either Pricing Schedule Option A of Pricing Schedule Option B as requested by the Commission’s representative. The Commission’s Representative must approve, in advance, of any changes to the monthly schedule. The schedule must take into account the following limitations:  All work must be carried out between the hours of 7:00 a.m. and 5:00 p.m. local time Monday to Friday.  No work shall be done on a statutory holiday unless approved by the Commission’s Representative.  Sport Playing fields are to be completed between Monday and Thursday each week.  Parks lands next to schools are to be mowed while children are in school not during recess, lunch or other periods when children are using the fields. The City reserves the right to order the discontinuance of the Contractor’s work for any period of time, to alter the mowing and trimming schedule, and to increase or decrease the number of sites covered by this contract. The Contractor is expected to be available to respond to a request for extra cutting of grass & trimming as required for special events, or a request to a change of the Contractors schedule. Notification of Vandalism and Safety Hazards Any problems, damages, or potential problems encountered by the Contractor during the work are to be brought to the attention of the Commission’s Representative. Such problems may include damaged trees or plants, damage to sidewalks and structures, vandalism and potential hazards to people and property. Removal of Vegetation and Litter All litter (i.e. papers, bottles, etc.) must be removed from the work area before mowing and trimming the lawn. During the mowing and trimming of the lawns, all grass thrown against buildings, windows or other structures and on to sidewalks, trails and all hard surfaces, is to be removed the same day. Cutting of Grass This includes the mowing of all grass areas in and around park area. Example : from park perimeter fence to curb side along road. The grass will be cut to a height of two (2) inches unless the Contractor is advised by the Commission’s Representative to adjust the cutting height. Cutting equipment used by the Contractor must have the ability to cut various heights of grass starting at a minimum height of two (2) inches. When mowing, care must be taken to SPECIAL TERMS OF THE CONTRACT Page 11 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming prevent tire scuff marks on ornamental light fixtures, etc. The scalping of lawns when mowing is also unacceptable. Trimming of Grass This shall include push mower, push mower, small ride on mower and grass trimmer work work to all areas that can not be cut by the contractor’s and Park’s large ride on rotary mowers. Please note: additional trimming will be required in grass areas that larger ride on rotary mowers cannot achieve an acceptable ‘close edge’ finish. Examples of trimming ‘elements’: Around fences; Post lines; Outfield baseball fences; Soccer goal posts; Fence corners; Playground structures; Trees and shrub beds; Other structures within the park. Trimming, typically, to be a minimum of 12 inches off/around any ‘element’ Trimming includes edging of all shrub/flower beds, with power grass trimmer, in all areas and concrete walkways in high priority areas, such as Memorial Parks, Government buildings, Fire Halls and Cenotaph areas etc. Trimming also includes the cutting of any vegetation growing through fencing and onto mowing areas, vegetation on walkways, sidewalks, curbs, parking areas, all other hard surfaces, and around any structures on gravel surfaces such as information signs, buildings, fire hydrants, concrete barriers, etc. The Contractor is also responsible for trimming any areas outside of the park perimeters. Example: from perimeter fence to curb side, along road right-of-way, including sidewalks. Equipment The Contractor must use the equipment that was listed in the Contractor’s response to the Request for Tender unless permission is received in advance from the Commission’s Representative to substitute another piece of equipment. The Contractors’ ride on mowers must be capable of picking up grass clippings and leaves as required. Disposal of Materials The Contractor is responsible for the removal and disposal of all vegetation and litter from the areas of the Parks that the Contractor is responsible for maintaining. These items include, but are not limited to, grass clippings, brush, leaves, bottles, cans, and paper. SPECIAL TERMS OF THE CONTRACT Page 12 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming The City does not provide a disposal site, therefore it is the Contractor’s responsibility to dispose of all material at a site that meets environmental and other government regulations. No burning of materials is allowed within the City of Maple Ridge or the City of Pitt Meadows. Damage to Plants and Trees The Contractor is to take all precautions, including the use of tree collars, to prevent damage to existing plants and trees from mowers, trimmers and other equipment. Any trees and shrubs, as well as any other park property damaged by the Contractor’s equipment, must be replaced as per direction from the Commission’s Representative. The size and type of trees to be replaced will be decided by the City. Insurance Coverage The Contractor awarded the contract is required to have a minimum of $5,000,000 in Comprehensive General Liability. Updated Certificates of Insurance are to be given to the City prior to performing any work under the contract. Supervision The Contractor shall have a responsible supervisor readily available at all times for progress meetings, inspection tours of the work, and to receive instructions regarding the scope of work and/or services from the City’s Representative. Priority of Contract Documents The final contract will consist of the following documents and, where there is a conflict between the terms of these documents, the order of precedence will be the following: 1. Contract Award 2. Amendments to the Contract 3. Special Terms of Contract 4. General Terms of Contract 5. Bidder’s Response to the Request for Tender Criminal Records Search Officers, staff and sub-contractors of the Contractor that will be performing work under this contract must provide proof to the City of having undergone a Criminal Records Search as outlined in the General Terms of Contract, prior to commencing any work at the sites. Name Badges and Uniforms All officers and staff of the Contractor performing work under this contract must wear shirts in accordance with WorkSafeBC regulations, and these shirts must allow for the visual identification of the individual as one of the Contractor’s staff. At a minimum the shirts must have the Contractor’s name on the front and back of the shirt. SPECIAL TERMS OF THE CONTRACT Page 13 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Invoices and Payment Invoices are to be submitted once a month to the City of Maple Ridge as per the instructions in the Invoices and Payment section of the General Terms of the Contract. All invoices submitted to the City of Maple Ridge shall clearly indicate the Work Order number (see Pricing Schedule Option A or see Pricing Schedule Option B) for the park where the work was completed. Business Licences The Contractor awarded this contract will be required to obtain a City of Maple Ridge and City of Pitt Meadows Business Licence (or equivalent Fraser Valley Intermunicipal Business License) before performing any work under this contract. WorkSafeBC Coverage The Contractor must be in good standing with the WorkSafeBC. A WorkSafeBC Registration number and a current WorkSafeBC Clearance Letter must be submitted to the City of Maple Ridge prior to beginning work and the Contractor must remain in good standing with WorkSafeBC for the duration of any contract term. Contract Negotiation The City reserves the right to negotiate specific terms of the contract with the Contractor as the contract progresses. Inspection of Work See General Terms section Page 23. End of Section Special Terms of the Contract GENERAL TERMS OF THE CONTRACT Page 14 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming General Terms of Contract The General Contract Terms and Definitions appearing in this document shall form part of any contract that may be awarded. Definitions In the contract, unless the context otherwise requires: ‘Commission’ will mean the Maple Ridge/Pitt Meadows Parks & Leisure Services Commission. The Commission is responsible for the administration of the parks and recreational facilities for the City of Maple Ridge and the City of Pitt Meadows. ‘Contractor’ will mean the party awarded the contract by the City of Maple Ridge. ‘City” will mean the City of Maple Ridge. ‘Commission’s Representative’ will mean the managers, employees and agents of the Commission, the City or the Department designated by the Commission to administer work under this contract. ‘Department’ will mean the Maple Ridge/Pitt Meadows Parks & Leisure Services Department. The Department administers and operates the parks and recreation facilities on behalf of the Commission. ‘Normal Work Day’ will mean Monday to Friday from 7:00 a.m. until 5:00 p.m. ‘School District’ will mean the School District No. 42. ‘Site’ will mean the buildings and properties within the City of Maple Ridge and City of Pitt Meadows owned, operated and/or administered by the Commission. ‘Work’ will mean all the work required to be done for the execution and the completion of the contract to the satisfaction of the Commission and/or City of Maple Ridge. Gender Wherever the singular or masculine is used throughout this contract, the same shall be construed as meaning the plural or feminine or body corporate, as the context or the parties hereto so require. Contractor’s Expense The Contractor shall at his own expense, unless it is expressly stipulated to the contrary, provide, supply, observe, perform and do everything which, in the opinion of the City, may be required for the setting out, the execution and the completion of the work and the fulfilling of the contract. GENERAL TERMS OF THE CONTRACT Page 15 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Assignment or Sub-letting of Contract The Contractor shall keep the work under his personal control, and shall not, without the consent in writing of the City, assign or sub-let this contract or any part thereof. If the City should consent to any such assignment or sub-letting of this contract or part thereof the Contractor shall by reason thereof be in no way relieved from his responsibility for the fulfillment of the work, but shall continue to be responsible for the same in the same manner as if the said work had been performed by the Contractor himself. Insurance Coverage Depending on the type of service the Contractor is performing for the City, the Contractor may be required to have one or more of the following insurance policies: Comprehensive General Liability Insurance, Professional Liability Insurance, and Motor Vehicle Insurance. The City will advise the Contractor as to which coverage(s) are required as part of the Special Terms of the Contract. The following terms outline the requirements of each ty pe of insurance and the general requirements of the City for insurance coverage. Comprehensive General Liability Insurance Prior to starting work on the City’s properties the Contractor must have Comprehensive General Liability Insurance covering the term of the contract and remaining in effect for sixty (60) days following Substantial Performance of the contract or termination of the contract, whichever is later. The insurance policy shall be extended to cover Broad Form Blanket Contractual Liability including, but not limited to, Products and Completed Operations Liability, Personal Injury Liability, Non-Owned Automobile Liability, Owner’s and Contractor’s Protective Coverage, and Contingent Employers’ Liability. Products and Completed Operations Liability Insurance shall be maintained for a period of twelve (12) months from either the date of acceptance of the project by the City, or the termination of the contract, whichever is later. The:  The City of Maple Ridge,  City of Pitt Meadows, and  School District No. 42, their officers and/or officials, employees, and volunteers shall be added as “Additional Insured”, but only with respect to vicarious liability arising out of the operations of the Named Insured for which a permit, license, agreement or contract is issued by or entered into with the City. The policy shall also include Cross Liability, Waiver of Subrogation and Severability of Interests clauses. Any failure to comply with any provision of the insurance policy by the Named Insured shall not affect coverage provided to the City. GENERAL TERMS OF THE CONTRACT Page 16 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming The amount of coverage will be set by the City based on the perceived risk involved in the activities of the Contractor in performance of the specific contract. The minimum amount will fall on or between $2,000,000 and $5,000,000. The exact amount required will appear in the Special Terms of the Contract. Professional Liability Insurance Professional Engineers, Geoscientists and Architects must have Professional Liability Insurance, also known as Errors and Omissions Insurance covering the term of the contract and for a period of two (2) years following Substantial Performance of the contract or the termination of the contract, whichever is later, in addition to the Comprehensive General Liability Insurance required in the previous contract term. The amount of coverage will be set by the City based on the nature of the project and the perceived risk, but shall not be less than $250,000 per claim and $500,000 aggregate per annum with a maximum $5,000 deductible. The exact amount required will appear in the Special Terms of the Contract. Primary Insurance The policies for Comprehensive General Liability Insurance and Professional Liability Insurance shall apply as primary insurance and not excess to any other insurance available to the City of Maple Ridge, City of Pitt Meadows and School District #42. Motor Vehicle Insurance The Contractor must have Motor Vehicle Insurance, including Bodily Injury and Property Damage coverage, covering the term of the contract for all motor vehicles, whether owned, non-owned or hired, used in the performance of the contract. The insurance policy must be with the Insurance Corporation of British Columbia (I.C.B.C.) or another insurer if pre- approved by the City prior to the award of a contract. The insurance policy will be in the amount of $3,000,000 per accident. Certificates of Insurance The Contractor shall provide to the City a copy of a Certificate of Insurance, completed in its entirety, and signed by the Insured’s Broker, as evidence of the insurance requirements, outlined herein, for Comprehensive General Liability and Professional Liability Insurance. For owned motor vehicles the Contractor shall file with the City a copy of I.C.B.C.’s Form No. APV 47 entitled “Confirmation of Insurance Coverage” and for non-owned, including hired, vehicles, if not included in the Comprehensive General Liability Insurance, I.C.B.C.’s Form No. APV 29 entitled “Non-Owned Automobile Policy”, as evidence of the insurance, outlined herein, for Motor Vehicles. Cancellation of Insurance The insurance policies required under this contract shall provide that they cannot be cancelled, lapsed or materially changed during the period of coverage required by the GENERAL TERMS OF THE CONTRACT Page 17 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming contract without thirty (30) days written notice to the City prior to any change in the policy. In the event cancellation is due to non-payment of the premium, fifteen (15) day’s written notice to the City, prior to cancellation, is required. Written notice is to be sent by registered mail. Failure to Comply with Insurance Requirements Should the Contractor neglect to obtain and/or maintain insurance as required within this contract, or to deliver such policies to the City, then it shall be lawful for the City to obtain and/or maintain such insurance and the Contractor hereby appoints the City his true and lawful attorney to do all things necessary for this purpose. All monies expended by the City for insurance premiums under the provisions of this clause shall be charged to the Contractor. Indemnity The Contractor shall make good and restore and make full compensation for any injury or damage done to or sustained by the Pitt Meadows/Maple Ridge Parks & Leisure Services Commission, City of Maple Ridge, City of Pitt Meadows, School District 42 and/or the Department or any person or persons or any building, premises, or any other property whatsoever and shall settle all claims in respect thereof and shall indemnify, protect and save harmless the Pitt Meadows/Maple Ridge Parks & Leisure Services Commission, City of Maple Ridge, City of Pitt Meadows, School District 42 and/or the Department therefrom and from and against all claims, demands, suits, or actions of every kind, description and nature whatsoever arising out of or any way connected with the fulfillment of this contract, or brought against the Pitt Meadows/Maple Ridge Parks and Leisure Services Commission, City of Maple Ridge, City of Pitt Meadows, School District 42 and/or the Department in respect of anything done, suffered or omitted in the execution of or in connection with the work. The Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department shall be at liberty to settle or compromise any such claim, demand, suit or action and any damages, compensation and costs paid or incurred by the Pitt Meadows, the Commission, the City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department all such claims, demands, suits or actions recoverable from the Commission, the City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department or the property of the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department shall be a debt due to it from the Contractor, and recoverable by action or by set-off against any money due from or to the Contractor. Claims Against and Obligations of the Contractor or Subcontractor The Contractor agrees to keep the construction site and all property of the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department free and clear of all builders liens and agrees to forthwith, following receipt of notice by the Commission of any such liens, cause the same to be discharged, whether the liens or claims in respect thereto are valid or not valid. The Contractor agrees with the City that, notwithstanding any provisions of this agreement to the contrary, the Commission, the City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department shall not be obliged to pay any monies whatsoever to the Contractor during the time that any builders’ liens or other liens are registered or filed against the construction site or property owned by the Commission, the City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department. GENERAL TERMS OF THE CONTRACT Page 18 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Safety Precautions The Contractor shall take all measures required to ensure the safety of his employees, sub - contractors, the general public and the employees of the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department. The Contractor shall, when necessary, supply all men, equipment, barriers, traffic signs and control, safety equipment, watchmen, etc., and will be fully responsible for carrying out work in a safe manner. The Contractor will also be responsible for, when necessary, and at his own expense, for ensuring all gas lines, hydro lines, telephone lines, water lines and sewer lines have been safely shut off or capped by the proper authority and pose no threat or inconvenience. When flagging for traffic control, the latest edition of the Province of British Columbia Ministry of Transportation and Highways Traffic Control Manual for Work on Roadways is to be used as reference. It is the responsibility of the Contractor to advise the Commission’s Representative of any toxic or hazardous material that will be used by the Contractor in the performance of the work, and to provide to the Commission’s Representative all Material Safety Data Sheets required by the WHMIS regulations prior to commencing the work. The City reserves the right to refuse permission for the Contractor to use a specific product or material if, in the City’s sole opinion, the product or material will constitute an unacceptable risk to the health of the general public and the employees of the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department. Property Damage The Contractor will be responsible for notification to property owners if access to private property is required. All repairs to accidental damaged to private property, i.e. fences, landscaping, driveways, broken windows of vehicles and/or buildings etc., will be the sole responsibility of the Contractor. The Contractor will also be held responsible for the repairs to any Municipal property damage caused by the Contractor in the performance of the work. Damage to Work The Contractor shall be responsible for any and all loss or damage whatsoever which may occur on or to the works, completed or otherwise, until such time as the entire works have been completed and accepted by the City, except that loss or damage caused solely by an act of the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department or resulting from an act beyond the control of the Contractor. In the event of any loss or damage occurring, the Contractor shall, on notice from the Commission’s Representative, immediately put the work into the condition it was in immediately prior to such loss or damage, all at the Contractor’s expense, except where such loss or damage was caused solely by an act of the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department. The Contractor shall be responsible for any and all loss or damage whatsoever which may occur on or to the works, completed or otherwise, arising out of the negligence of the Contractor, any sub-contractors, and any officers, employees or agents of the Contractor or the sub-contractors. GENERAL TERMS OF THE CONTRACT Page 19 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming It is the responsibility of the Contractor to report any damage found at a work site, prior to the start of the work, to the Commission’s Representative responsible for the specific project. The Commission’s Representative will advise the Contractor as to the action required by the Contractor, including, but not limited to, the repair of the damaged item by the Contractor at the City’s expense. Service of Notice Any notice or other communication given by the City to the Contractor under this contract shall be deemed to be given if left at the office of the Contractor, delivered to any of the Contractor’s officers, employees or agents at the office listed in this contract, or posted on the work site. Any notice or other communication given by the Contractor to the City under this contract shall be deemed to have been given if left at the office of the City of Maple Ridge, the City of Pitt Meadows, Purchasing Division or delivered to the Purchasing Manager, Purchasing Supervisor or Commission’s Representative at the office of the City of Maple Ridge listed in this contract. In the situation of a communication delivered by Registered Mail or Courier, delivery will be deemed to have occurred at the time the postal or delivery receipt is acknowledged by the party receiving the communication. Protection of City Against Patent Claims The Contractor shall hold and save the Commission, the City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department, their officers, agents, servants, and employees, harmless from liability of any nature or kind, including costs and expenses for or on account of any copyrighted or uncopyrighted composition, secret or other process, patented or unpatented invention, articles or appliance manufactured or used in the performance of this contract, and/or used or to be used by the City before or after completion of the work unless otherwise stipulated in this contract, and if the Contractor shall fail to save harmless the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department, their officers, agents, servants, or employees in manner aforesaid, any money collected from the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department, their officers, agents, servants, or employees by reason of such failure shall be charged to the Contractor. Ownership Any and all reports, documents, computer software, or other items of any nature whatsoever, created by the Contractor in the performance of the work for this contract, whether completed or not, shall be the sole property of the City, and shall be delivered to the City at the end of a specific project, the end of the contract, or upon request. The City shall own all patents and copyrights in any work or item created by the Contractor during the performance of the contract. All instruction, repair and parts manuals provided by a manufacturer for equipment supplied by the Contractor or sub-contractor under this contract shall be given to the Commission’s GENERAL TERMS OF THE CONTRACT Page 20 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Representative at the end of the project, and the City reserves the right to withhold final payment for the work until the manuals are received. Software Virus The Contractor warrants that any software supplied under this contract has been tested for, and found to be free of, viruses. The Contractor agrees to indemnify and hold harmless the City from and against any claims for loss or damages arising from delivery of, or use of software containing viruses. Co-operation The Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department shall be at liberty to enter upon the site of the work with workmen and materials to do work not comprised in this contract and the Contractor shall afford any such workmen all reasonable facilities to the satisfaction of the City. The Contractor shall arrange his work and dispose of his materials in such a manner as will not interfere with the work or storage of materials of the City or of others upon the work site. The Contractor shall join his work to that of others and perform his work in proper sequence in relation to that of others to the satisfaction of the City. The Contractor shall co-operate with all other contractors who may be performing work on behalf of the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department and workmen who may be employed by the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department on any work in the vicinity of the project. The Contractor shall make good promptly, at his own expense any injury or damage that may be sustained by other contractors or employees of the Commission, the City of Maple Ridge, School District 42 and/or the Department at his hand. Any difference or conflict arising between the Contractor and any other contractor employed by the Commission, City of Maple Ridge, City of Pitt Meadows, School District 42 and/or the Department or between the Contractor and workmen of the Commission, City of Maple Ridge, City of Pitt Meadows, School District 42 and/or the Department with regard to their work shall be submitted to the Commission’s Representative responsible for the project the Contractor is engaged in and the Contractor shall abide by his decision in the matter. Delays If the Contractor delays in the commencement, execution or completion of the work, and the delay is not caused by the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department, the City will not accept any claim by the Contractor and the Contractor will indemnify and reimburse the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department for all costs, expenses, damage and losses it incurs thereby. Where a delay is clearly not the fault of the Contractor, but is the sole fault of the Commission, City of Maple Ridge, City of Pitt Meadows, School District 42 and/or the Department, the City shall extend the Contract time, but no claims by the Contractor for delay or damages shall be allowed and the same are hereby waived by the Contractor. GENERAL TERMS OF THE CONTRACT Page 21 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Suspension or Termination of Work The Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department may, in their sole discretion and without giving reasons, require the Contractor to either terminate his execution of the work, or suspend that work for a specified or unspecified period, by communicating written notice to that effect to the Contractor. The Contractor, upon receiving notice of the requirement pursuant to the above paragraph, shall immediately terminate or suspend all operations except those which, in the Commission’s, City of Maple Ridge, the City of Pitt Meadows, School District 42’s and/or the Department’s opinion, are necessary for the care and preservation of the work. Compensation relating to the suspension or termination shall be in proportion to the portion of work completed at the time of suspension. Changes – Determination of Cost Whenever it is necessary to determine the amount of a change in the Contract Price due to a change in the work, or upon receipt of written notice of suspension or termination of the work, the Contractor shall submit to the Commission’s representative a firm price quotation. Should the City find the quotation submitted by the Contractor unacceptable, the value of the change shall be determined from the substantiated cost to the Contractor of labour and cost of materials incorporated in the work, plus a fixed percentage fee to cover overhead, profit and, indirect costs. Deviation from Contract The Contractor shall not make any alterations or variation in, or addition to, or deviation or omission from the terms of the contract without the written consent of the City. Work Site Cleanup The Contractor will maintain the work site in as clean a condition as possible, to the satisfaction of the City, and will remove from this and the surrounding properties any debris from his work on a daily basis. Failure to do this will result in the cleaning and removal being instituted by the City and the associated costs being deducted from the amount owing to the Contractor. It is the Contractor’s responsibility to provide the necessary employees, equipment and supplies to return the site to the same or better level of cleanliness that the site was in prior to the commencement of the work. Applicable Law Each party’s performance hereunder shall comply with all applicable laws of British Columbia, Canada. This contract shall be governed by and interpreted in accordance with the laws of the Province of British Columbia. If any part, term or provision of this Agreement shall be held void, illegal, unenforceable, or in conflict with any applicable law, the validity of the remaining portion of provision shall not be affected hereby. GENERAL TERMS OF THE CONTRACT Page 22 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Invoices and Payment The Contractor shall send invoices to: Attention: Accounts Payable, City of Maple Ridge, 11995 Haney Place, Maple Ridge, BC, V2X 6A9. The full name of the Commission’s Representative responsible for the specific project, and the project number and title should appear on all invoices sent to the City. Payment by the City shall then be made within the standard Net 30 days after the delivery to the City’s Finance Department of properly prepared invoices, unless the payment terms offered by the supplier are deemed an advantage to the City, or the City has deemed a portion of payment is to be held back pending satisfactory completion of the contract. Payments for Labour and Materials The Contractor shall pay any and all accounts for labour, Worker’s Compensation, Unemployment (Employment) Insurance, wage and salary deductions required by law, services and materials used by him during the fulfillment of this contract as and when such accounts become due and payable, and shall furnish the City with proof of payment when of such amounts in such form and as often as the City may request. Should payment of such accounts not be made when and as the same become due, the City shall be at liberty to pay the same and all monies so paid by the City shall be charged to the Contractor. Proof of payment for the items listed herein shall also be required from sub-contractors contracted or hired by the Contractor to perform work under this contract. Charges to Contractor Everything charged to the Contractor under the terms of this contract shall be paid by the Contractor to the City on demand and may be deducted by the City from any monies due or to become due to the Contractor under this contract and may be recovered by the City from the Contractor. Guarantee The work shall be guaranteed by the Contractor for a minimum period of one year from the date of completion and acceptance of the work by the City, and shall include both materials and labour. The Contractor shall promptly upon receipt of notice in writing from the Commission, City of Maple Ridge, City of Pitt Meadows, School District 42 and/or the Department so to do, make all repairs arising out of defective materials, workmanship, and equipment. The Commission, City of Maple Ridge, City of Pitt Meadows, School District 42 and/or the Department are hereby authorized to make such repairs if ten days after giving of such notice to the Contractor, the Contractor has failed to make or undertake with due diligence said repairs; provided however, that in case of an emergency where, in the opinion of the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department, delay would cause serious loss or damage, repairs may be made without notice being sent to the Contractor and all expense in connection therewith shall be charged to the Contractor. This guarantee will not restrict any warranties or guarantees stipulated by law or implied. GENERAL TERMS OF THE CONTRACT Page 23 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Warranties The Contractor shall provide to the City copies of all warranties and/or guarantees provided by the manufacturers of the materials and/or equipment supplied under this contract. Inspection of Work All work done by the Contractor shall be subject to inspection and shall meet the approval of the Commission’s Representative, whose decision shall be final and binding upon all parties. Should the work be defective in quality or workmanship, or fail to meet specifications as set forth for the project in question, the Commission’s Representative shall have the right to insist on immediate correction. Cancellation of Contract The acceptability of the work performed by the Contractor will be solely determined by the City or the Commission’s Representative in charge of the specific project. If at anytime during the contract the Contractor fails to meet the requirements and/or expectations of the City the remainder of the contract may be cancelled by the City immediately upon written notice to the Contractor. Either party to this contract may cancel the contract upon thirty days written notice to the other party. Waiver of Rights No action nor want of action on the part of the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department at any time to exercise any rights or remedies conferred upon it under this contract shall be a waiver on the part of the Commission, City of Maple Ridge, the City of Pitt Meadows, School District 42 and/or the Department of any of its said rights or remedies. General Quality The whole of the work shall be done in the most substantial and workmanlike manner with new materials, articles and workmanship of the latest and best quality and description and in strict conformity with and as required by this contract. The Contractor shall upon the request of the Commission’s Representative furnish him with all vouchers, receipted bills, and other documents showing materials, articles, and workmanship used by the Contractor doing the work. Scheduling of Work The Contractor, prior to starting a new project, shall inform the Commission’s Representative of the Contractor’s monthly work schedule for the project. The Commission’s Representative has final approval of the work schedule and may request changes where, in his opinion, they are warranted by the requirements of the project. The Contractor will keep the Commission’s Representative informed on the progress of the work and advise the Commission’s Representative of any delays upon learning of the delay. GENERAL TERMS OF THE CONTRACT Page 24 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming Supervisor The Contractor shall have a responsible supervisor readily available at all times for progress meetings, inspection tours of the work, and to receive instructions from the Commission’s Representative. Licences, Bylaws, Permits, Regulations All Federal, Provincial and Municipal laws, bylaws and safety regulations are to be observed by the Contractor. The Contractor shall apply for, and obtain at his own expense, and keep available for inspection, all necessary permits and licences required for the execution of the work. This will include, but not be limited to, Maple Ridge and Pitt Meadows Business Licences, building permits and certificates. The Contractor shall give all necessary notices and pay all fees required by law and comply with all laws, ordinances, rules and regulations relating to the work and to the preservation of public health. The Contractor shall be responsible for the safety of all workers and equipment on the project in accordance with all applicable safety legislation passed by federal, provincial and local authorities governing construction safety. The Contractor shall post all notices and signage required by law including, but not limited to, the signage required by the Building Code, the Builder’s Lien Act and the WCB Regulations. WorkSafeBC The Contractor, any sub-contractor, or other person employed by the Contractor, or with whom the Contractor may take any contract for the performance of any of the work, shall be in good standing with WorkSafeBC and will comply with all conditions WorkSafeBC throughout the duration of this contract. The Contractor will be deemed as the “Prime Contractor” and will be solely responsible for having all work sites secured in accordance with the WorkSafeBC safety regulations and ensure that no danger will befall the Contractor’s employees, sub-contractors or the general public at any time during the progress of a project under this contract. Signs and Publicity Neither the Contractor, his subcontractors, nor anyone directly or indirectly employed by any of them, shall post any site signs, nor release any publicity reports, photographs, or other information, orally or in writing, concerning the work performed or to be performed, without the prior written approval of the Commission. Name Badges and Uniforms All officers, employees and agents of the Contractor, or of a Sub-Contractor employed or contracted by the Contractor, that will be working on the Commission’s, City, City or School District 42’s property shall wear a company shirt with the name of the Contractor or Sub- Contractor clearly visible on the front of the shirt, or shall carry picture identification that is attached to the outside pocket of their clothing. GENERAL TERMS OF THE CONTRACT Page 25 of 31 ITT-PL14-67 Parks Grass Mowing and Trimming The Commission reserves the right to request and approve identification from anyone allegedly entering Commission, City, City and/or School District 42 property for the purpose of performing work under this contract. The requirement for Name Badges and Uniforms will appear in the Special Terms of the Contract. Occupational Health and Safety Program All Contractors working for the City are to be aware of the City of Maple Ridge Occupational Health and Safety Program. It is the Contractor/Subcontractor’s responsibility to perform the job in compliance with the Corporate safety standards. The Contractor/Subcontractor is responsible for the compliance, of all employees for whom he is primarily responsible, with all Corporate Safety Programs, WorkSafeBC Health and Safety Regulations, as well as all other applicable regulations. The Contractor will also be required to work with the City representative to meet all the responsibilities outlined in the City of Maple Ridge Contractor Safety Coordination program. Any infraction not immediately corrected, as directed by the Corporate Representative, will result in the Contractor/Subcontractor being advised of a breach of contract, and advised of action we will take as a result of the breach. It must be definitely established that all workers on the job, including all Subcontractor’s employees, comply with our safety program. Criminal Records Search All officers, employees and agents of the Contractor, or of a Sub-Contractor employed or contracted by the Contractor, that will be working on the Commission’s, City of Maple Ridge, City of Pitt Meadows School District 42’s and/or the Department’s property, may require a Criminal Records Search before being allowed to perform work on the property. Results of the Records Search must be forwarded to the City of Maple Ridge Personnel Division before work commences under this contract. The cost of the Criminal Records Search is the responsibility of the Contractor or sub-contractor. Individuals are to report in person to the nearest Police department in the area where they reside to request their Criminal Records Search. The requirement for a Criminal Records Search will appear in the Special Terms of the Contract. An exemption may be granted for a Sub-Contractor if the nature of the work being performed by the Sub-Contractor does not require the Sub-Contractor to enter the Police buildings, Commission, City of Maple Ridge, City of Pitt Meadows, School District 42 and/or the Department properties where there are children present, or where no security considerations apply. This exemption must be obtained prior to the commencement of any work by the Sub- Contractor and is at the discretion of the Commission. The notice of exemption must be in writing and signed by the Commission’s Representative. FORM OF TENDER ITT-PL14-67 Parks Grass Mowing and Trimming FORM OF TENDER Business Name: ____________________________________________________________ Address: __________________________________________________________________ __________________________________________________________________________ Contact Name: ____________________________________________________________ Title or Position: ___________________________________________________________ Phone Number: __________________________ Facsimile ________________________ Email: ___________________________________________________________________ Date: ____________________________________________________________________ For: Project: ITT-PL14-67 Parks Grass Mowing and Trimming (Hereinafter referred to as the “Work”) To: City of Maple Ridge 11995 Haney Place, Reception Desk (Main Floor) Maple Ridge, BC, V2X 6A9 Attention: Nichole Walsh, Purchasing Supervisor Tel: 604-466-2610 Fax: 604-466-4328 Email: nwalsh@mapleridge.ca CONTRACT PRICE Having fully examined the site and all conditions affecting the work, and having carefully read and examined the tender documents, drawings and addenda____ thru __________ (list addenda, if any issued as supplements to the tender documents, the undersigned hereby offers to furnish all plant, tools, equipment, labour, products, material and supervision necessary to execute the Work as per the following price break down; prices to be in Canadian Currency, not including GST: FORM OF TENDER ITT-PL14-67 Parks Grass Mowing and Trimming 1.Please insert the “total cost for mowing services of all sites” from Pricing Schedule Option A (taxes not included) $ _____________________ 2.Please insert the “total for mowing and trimming services of all sites” from Pricing Schedule Option B (taxes not included) $ _____________________ ***REMEMBER TO COMPLETE THE ITEMIZED PRICING IN “PRICING SCHEDULE OPTION A” AND “PRICING SCHEDULE OPTION B”. INCLUDE ALL PRICING SHEETS WITH YOUR TENDER SUBMISSION**** CONTRACTOR NUMBERS AND STATUS Our City Maple Ridge Business License Number: __________________________ Our City of Pitt Meadows Business License Number: _________________________ Or: Fraser Valley Intermunicipal Business License ________________________ Our WorkSafeBC Registration Number: __________________________ State whether you are able to meet the insurance requirements: Yes _______ No________ NOTIFICATION If notified in writing by the City of acceptance of this tender within the specified acceptance period after the tender closing date, we shall: (a) provide, prior to commencing work, certified copies of the Contractor’s insurance called for in the Tender Documents; (b) provide our WorkSafeBC Registration Number and a current WorkSafeBC Clearance Letter; (c) supply a Maple Ridge and Pitt Meadows Business License Number (d) enter into and execute a Contract Agreement for the Work; (e) Obtain criminal records checks. CONDITIONS We understand and agree that: (a) Failure to comply with and complete all items on this tender form may be cause for rejection without consideration of the tender. FORM OF TENDER ITT-PL14-67 Parks Grass Mowing and Trimming (b) This tender is irrevocable and will remain open for acceptance by the City for a period of ninety (90) calendar day from the date of closing of tenders. (c) Unless and until a Contract Agreement is executed, this tender together with the written acceptance by the City shall constitute a binding contract between the City and the undersigned. No other form of notification shall constitute a binding contract. 3. If you are using subcontractors please list them below and detail their qualifications and experience to perform the work: Contractor Contact Name Phone Related Qualifications/Experience 4. Please indicate in the space below where your firm will be disposing of the vegetation and litter from work sites? (Include name and address) If required, please include additional pages with your submission. Type of vegetation (grass, trimmings, or other) Disposal Site Name & Location Contact Name at Site Comments FORM OF TENDER ITT-PL14-67 Parks Grass Mowing and Trimming 5. Please list your employees and detail your and their qualifications and experience to perform the work: If required please include additional pages with your submission. Employee Name Length of Employment Qualifications / Experience Additional Comments 6. Please provide a detailed list of equipment that will be used in the performance of the work. List the make, model, year, and type of equipment. If required please include additional pages with your submission. Equipment Type Make Model Year Comments FORM OF TENDER ITT-PL14-67 Parks Grass Mowing and Trimming 7.List a minimum of four references (date of contract, business name, contact, phone number, nature of work): If required please include additional pages with your submission. Name/Contact Person Phone Email Scope of Services Provided Length of Contract FORM OF TENDER ITT-PL14-67 Parks Grass Mowing and Trimming I/We have read, understood, having carefully examined the Invitation to Tender, the Instructions to Tenders, agree to the General and Special Terms of Contract and all other terms and conditions contained herein, for the above stated project: This Tender is executed this __________ day of ___________________, 2014. Contractor: ___________________________________________________________ (FULL LEGAL NAME OF CORPORATION, PARTNERSHIP OR INDIVIDUAL) ___________________________________________________________ (AUTHORIZED SIGNATORY) ___________________________________________________________ (AUTHORIZED SIGNATORY) End of Section Form of Tender City of Maple Ridge TO: Her Worship Mayor Nicole Read MMEETING DDATE: May 2, 2016 and Members of Council FFILE NO: FROM: Chief Administrative Officer MMEETING: Committee of the Whole SUBJECT: Joint Airport Mediation Next Steps Strategy EXECUTIVE SUMMARY: On February 29, 2016 a joint meeting was held between Maple Ridge and Pitt Meadows facilitated by Dr. Gordon McIntosh called ‘Working Together’ Session. The purpose of the session was to discuss two topics: 1) the airport in order to achieve a strategy for alignment with governance expectations for the Society and 2) parks and recreation services to achieve effective transition of the service. From this session the following three follow-ups action were provided for the CAO’s to facilitate. RECOMMENDATION(S): This report is submitted for information only. DISCUSSION: a)Background Context: WORKING TOGETHER SESSION NEXT STEPS Following the facilitated session Dr. McIntosh submitted a session overview and identified five follow up actions (Attachment A). Following is an update on the five actions identified: 1.The Mayor’s issue a ‘Working Together’ Session media release. The media release was jointly distributed on March 2, 2016 (Attachment B). 2.The municipal Council’s use the “Cooperation Checklist” at the start of the joint sessions – at next joint session. The check-in tool is intended to help the parties address arising mattes that might affect cooperation efforts. It could be further developed as a protocol to guide communication, coordination, collaboration and conflict resolution efforts. The ‘Cooperation Checklist’ is included (Attachment C). The checklist will be included on the agenda for the proposed May 9, 2016 joint session. 3.That the CAO’s propose a regular administrative reporting and joint quarterly elected official session schedule for the parks and recreation service agreement termination process (and 1171 perhaps for a period afterward as well) by April, 2016. The report is to keep the municipal partners informed of activities and progress while the quarterly sessions ensure political alignment on policy directions required of administration. A quarterly schedule has been drafted for the routine meeting of the Maple Ridge and Pitt Meadows Councils (Attachment D). May 9, 2016 from 6:00 pm -8:00 pm is planned as the first of these quarterly sessions. The CAO’s will routinely report to their respective Council’s with verbal updates as necessary and will submit a joint update memo prior to the quarterly meetings to keep both Council’s apprised of actions identified for follow up or further discussion. 4. That the CAO’s assess and propose options to ensure Board quorum for the Airport Society by April, 2016. This action is in anticipation of the upcoming urgent need to make appointments at the 2016 Annual General Meeting (AGM). 5. That the CAO’s propose a process for Councils to create and adopt a mutually shared vision for the Airport by June, 2016. The idea discussed was a Forum including airport resource people and the Society Chair, lead by a facilitator, and preceded by a joint Council-orientation session (before or at the start of the Forum) about the current operation, legislative context and Society constitution. CONCLUSION: The CAO’s are suggesting a three session process to create and adopt a mutually shared vision for the airport. The three proposed sessions as stated above are Education, Visioning and Governance. The first of these sessions, education, is planned to occur as part of the joint session scheduled for May 9, 2016. Following the education session a visioning session will be coordinated. “original signed by E.C. Swabey” Prepared by: EE.C. Swabey CChief Administrative Officer, City of Maple Ridge Attachments: A. Dr. Gordon McIntosh Working Together Session Summary B. Working Together Session media release, dated March 2, 2016 C. Cooperation Checklist D. Draft 2016 Schedule for Quarterly Maple Ridge and Pitt Meadows Council Sessions Attachment A Attachment B Attachment C ATTACHMENT D Draft 2016 Schedule for Quarterly Maple Ridge and Pitt Meadows Council Sessions Host Date Time Location Maple Ridge Monday May 9, 2016 6:00 – 8:00 p.m. Blaney Room Pitt Meadows Monday July 25, 2016 6:00 – 8:00 p.m. TBA Maple Ridge Monday November 7, 2016 6:00 – 8:00 p.m. Blaney Room Pitt Meadows Monday January 30, 2017 6:00 – 8:00 p.m. TBA May June July S M T W T F S S M T W T F S S M T W T F S 1 2 3 4 5 6 7 29 30 31 1 2 3 4 26 27 28 29 30 1 2 8 9 10 11 12 13 14 5 6 7 8 9 10 11 3 4 5 6 7 8 9 15 16 17 18 19 20 21 12 13 14 15 16 17 18 10 11 12 13 14 15 16 22 23 24 25 26 27 28 19 20 21 22 23 24 25 17 18 19 20 21 22 23 29 30 31 1 2 3 4 26 27 28 29 30 1 2 24 25 26 27 28 29 30 5 6 7 8 9 10 11 3 4 5 6 7 8 9 31 1 2 3 4 5 6 August September October S M T W T F S S M T W T F S S M T W T F S 31 1 2 3 4 5 6 28 29 30 31 1 2 3 25 26 27 28 29 30 1 7 8 9 10 11 12 13 4 5 6 7 8 9 10 2 3 4 5 6 7 8 14 15 16 17 18 19 20 11 12 13 14 15 16 17 9 10 11 12 13 14 15 21 22 23 24 25 26 27 18 19 20 21 22 23 24 16 17 18 19 20 21 22 28 29 30 31 1 2 3 25 26 27 28 29 30 1 23 24 25 26 27 28 29 4 5 6 7 8 9 10 2 3 4 5 6 7 8 30 31 1 2 3 4 5 November December January S M T W T F S S M T W T F S S M T W T F S 30 31 1 2 3 4 5 27 28 29 30 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 1 2 3 25 26 27 28 29 30 31 29 30 31 1 2 3 4 4 5 6 7 8 9 10 1 2 3 4 5 6 7 5 6 7 8 9 10 11