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Water Supply Update 2003

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Water Supply Update 2003 5.4 Utilities Committee Meeting Date: September 12, 2012 To: Utilities Committee From: Stan Woods, Senior Engineer, Utility Planning Department Marie Griggs, Public Involvement Division Manager, Engineering and Construction Department Date: August 21, 2012 Subject: Key Elements of the Draft Joint Water Use Plan for the Capilano and Seymour Watersheds and Proposed Engagement and Consultation Process Recommendation: That the GVWD Board direct staff to proceed with public engagement on the Key Elements of the Draft Joint Water Use Plan for the Capilano and Seymour Watersheds as developed by the consultative committee and provide the results of this consultation when presenting the completed Plan for Board adoption. 1. PURPOSE To advise the Board that the JWUP Consultative Committee has developed a consensus outcome and unanimously endorsed the final report. To receive Board approval to consult with the broader public on the Key Elements of the Draft Joint Water Use Plan for the Capilano and Seymour Watersheds dated August 8, 2012 (Attachment 1). 2. CONTEXT Development of the draft Water Use Plan follows the Provincial Water Use Plan Guidelines, and is about how the reservoirs are operated and how water is released from the reservoirs for different purposes (as examples: drinking water supply, environmental/fish flows and proposed hydropower generation). A key objective of the Joint Water Use Plan (JWUP) process is to explore whether and how hydropower generation from existing reservoirs can be accommodated within Metro Vancouver’s commitment to: continuing to supply clean, safe drinking water; protecting the environment and fish habitat; and adapting to climate change. Other interests such as recreation, culture and heritage, and safety have been reviewed within the planning process. Metro Vancouver has established a process for developing the JWUP in accordance with the thirteen steps outlined in the provincial Water Use Plan Guidelines. The process integrates technical study and evaluation with structured decision-making and public consultation. Over the last 20 months, Metro Vancouver has been working with key interested parties through a Consultative Committee, to develop the key elements of a draft Joint Water Use Plan (JWUP) that reflects the unique characteristics of the Capilano and Seymour watersheds. At a meeting on July 19th the JWUP Consultative Committee unanimously endorsed and fully supported the key elements of the draft Joint Water Use Plan. This report seeks Board approval to consult with the broader public on the proposed Key Elements of the draft JWUP detailed in Section 2.1. 2.1 Proposed Key Elements of the Draft JWUP 2.1.1 Proposed Capilano and Seymour Hydropower Projects As part of the water use planning process a hydropower consultant worked with Metro Vancouver staff to assess potential hydropower project options and proposed a hydropower project for Cleveland Dam with the following elements; new surface intake on the west side of Capilano Reservoir, with an underground tunnel and shaft connecting to an underground powerhouse discharging to the existing diversion tunnel that in turn discharges to the west side of the lower end of the Cleveland Dam plunge pool (see Attachment 1 for project layout). The proposed hydropower project for Seymour Falls Dam has the following elements; water for power generation would be diverted at the existing Howell-Bunger valves, with a new penstock routed along the downstream face of the dam and connecting to a surface powerhouse on the East Bank of the Seymour River that would discharge to a new tailrace channel that in turn discharges to the east side of the Seymour River (see Attachment 1 for project layout). The environmental design and operating aspects of the proposed hydropower projects are discussed in the next section. 2.1.2 Proposed Capilano and Seymour Reservoir Operation and Environmental/Fish Flow Releases The Seymour and Capilano Reservoirs are normally full during the fall, winter and spring months. During these periods the reservoirs fill to their maximum storage capacity with large amounts of water spilling from each reservoir. The proposed hydropower projects are envisaged to make use of the existing dam infrastructure to produce electricity from water that would spill from the reservoirs. Energy generation would assume the 3rd priority of the reservoir flow regime after drinking water supply and environmental/fish flows, respectively. Capilano Reservoir Given the above priorities, the proposed Capilano Reservior hydropower project would generally generate energy, in the summer, only if water was spilling from the reservoir. In the winter (November 1 to April 30) energy may be generated at reservoir elevations between full pool (145.9 m) and 4 meters down (141.9 m). The JWUP Consultative Committee has proposed increases to the minimum fish flow releases from Capilano Reservoir to the lower Capilano River. New water control facilities would be built in conjunction with the proposed hydropower project to enable the delivery of these increased fish flow releases. The proposed Fish Design Objectives and Criteria for the Capilano Power Project are detailed in Attachment 1. The proposed new minimum fish flow releases are as follows: • June 1 to November 30, releases vary from 0.57 cubic meters per second (cms) to 2.3 cms, depending on the level of Capilano Reservoir, the amount of reservoir spill, reservoir inflows, and Alpine Lake storage (see Attachment 1 for details); • December 1 to May 31, release of 1.2 cms (providing the Capilano Reservoir is maintained above 130m elevation). Seymour Reservoir Energy generation would assume the 3rd priority of the reservoir flow regime after drinking water supply and environmental/fish flows, respectively. Consequently, the proposed Seymour Reservoir hydropower project would generally generate energy, in the summer, only if water was spilling from the reservoir. In the winter (November 1 to April 30), energy may be generated at reservoir elevations between full pool (212.9 m) and 1 meter down (211.9 m). The JWUP Consultative Committee has proposed increases to the minimum fish flow releases from Seymour Reservoir to the lower Seymour River under most conditions. The proposed new minimum fish flow releases are as follows: • June 1 to November 30, releases vary from 0.7 cms to 2.8 cms, depending on the date, level of the Seymour Reservoir, and status of Alpine Lake storage (see Attachment 1 for details); • December 1 to May 31, release of 1.36 cms. 2.1.3 Proposed Monitoring and Communications Activities As recommended in the Provincial Water Use Planning Guidelines, and based on what is typical of other water use plans adopted in other locations in British Columbia, the JWUP Consultative Committee has suggested a number of monitoring and communications activities as part of the JWUP. The following provides an overview of the activities that are common to the two watersheds: • monitoring and annual reporting of reservoir water levels, drinking water withdrawals, fish flow releases and hydropower withdrawals (when commissioned); • monitoring and annual reporting of river flows, at one location, in the lower Capilano River below Cleveland Dam and at one location in the lower Seymour River below Seymour Falls Dam along with analysis and reporting of the rate of flow changes (ramping); • assessments needed for the final design of the hydropower project and and/or studies related to the operation of the hydropower project; • operation of a JWUP monitoring committee to provide annual feedback on the monitoring results and, as appropriate, advice on unique watershed conditions. Some of the monitoring activities that are unique to the Capilano watersheds are outlined below. Monitoring Activities Unique to Capilano Watershed A flow monitoring station has been operated on the Capilano River above Capilano Reservoir since 1914. This station is funded by Metro Vancouver and the draft JWUP proposes that this hydrometric station continue to be operated on an ongoing basis. The Board has committed to a “trap and truck” program on the Capilano Reservoir to capture out-migrating Coho and Steelhead smolts and transport them around the Cleveland Dam. The program reduces the mortalities associated with smolts passing over the Cleveland Dam spillway. Associated with this “trap and truck” program, monitoring is done to enumerate the out-migrating smolts. Prior to construction of the new surface intake for the hydropower project the monitoring results will be used to optimize the design of a new smolt capture facility associated with the new hydropower intake channel. After commissioning of the new smolt capture facilities the level of effort involved with the smolt monitoring program is expected to decrease. The JWUP Consultative Committee expects measurable improvements to fish habitat in the lower Capilano River once the proposed new fish flow releases are implemented, and has suggested the following monitoring for about two years prior, and up to five years after, the fish flow releases are changed: • water temperature monitoring; • biological response monitoring of status and trends in key fish species. 2.1.4 Proposed JWUP Implementation Schedule The following provides an overview of the key activities that are proposed for the period after Board approval to submit the JWUP to the regulatory agencies, and prior to approval of the JWUP by the regulatory agencies (anticipated in the latter part of 2013 or 2014). The following are common
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