Crescent Beach Climate Adaptation Strategy
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- Area Characteristics
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Crescent Beach Climate Adaptation Strategy The City of Surrey has developed a comprehensive stormwater management strategy for the Crescent Beach community to address the long-term drainage needs within the area. This is a multi-phased program that will result in a new storm sewer network in Crescent Beach. Area Characteristics The Crescent Beach community is situated within the Boundary Bay floodplain. The community is protected from storm surge and tidal events by a series of dykes. Historically, the area was primarily drained through infiltration due to the sandy nature of the community. As homes have redeveloped and larger portions of lots have been paved, infiltration capacity has diminished. In addition to a reduced infiltration capacity, winters are now resulting in higher ocean levels and periods of prolonged precipitation causing an increase to local groundwater levels. This increase further reduces infiltration capacity and results in water ponding on the surface, leading to an increased potential for the flooding of basements and crawlspaces. Adding to this, climate change (sea level rise) and land subsidence have an impact on local drainage within the Crescent Beach community.
In response to these challenges, the City sought to develop and implement a Climate Adaptation Strategy for the Crescent Beach area.
The objectives of the Climate Adaptation Strategy for the Crescent Beach area are to: •
Reduce the impacts from increasing precipitation, and rising sea and groundwater levels; •
Reduce the impacts from redevelopment; •
Satisfy community expectations and gain community acceptance and support for the proposed strategy; and •
territory in Crescent Beach.
During development of the strategy, questionnaires were distributed to the Community including a questionnaire to learn of the various drainage issues experienced in the community. Using the information gathered through this consultation process, the City developed a series of servicing strategies. Prior to selecting a strategy, a second questionnaire was distributed to determine the community’s support for the potential servicing options. The selected Crescent Beach Climate Adaptation Strategy, which was developed from the community input, is as follows: •
groundwater levels by dewatering saturated soils near the surface; •
Construct a new pump station to pump water collected by the perforated pipes to the ocean; •
Raise lands, including existing roads, to provide long term flood protection for the community and lower the risk of flooding; and •
address sea level rise predictions.
Implementing the Climate Adaptation Strategy The Crescent Beach Climate Adaptation Strategy will be implemented under a multi-phased program. The first phase of the program started in 2013 with improvements to the Maple Pump Station.
Subsequent phases involve the installation of a storm sewer network to provide efficient conveyance system that will help control groundwater levels and address winter storm events. As part of the storm sewer installation, local roads will be raised by approximately 1 foot to address groundwater issues and to slowly raise the entire community over time to provide improved flood protection. Following completion of the pump station, construction of the new storm sewer network commenced along Gilley Street and Gordon Avenue. This phase of the program will be completed in October 2016, dependent upon weather conditions. The next phase of the program is currently under design and will include work along O’Hara Lane, McBride Avenue, Agar Street, and Gardiner Street. It is anticipated that construction of this phase of the program will commence in the Spring 2017.
During each phase of the program the City will meet with residents and present project designs to obtain community feedback and support prior to proceeding to construction. Even with the work already completed and those underway, many areas of Crescent Beach are still too low to be adequately protected against rising groundwater levels. As a result, properties will need to be raised over time to prevent flooding. In the future, the City will also raise the existing dykes to protect against future sea level rise and storm surges. These works are part of the regional flood protection strategy currently under development. Information on the current flood construction works can be found at http://www.surrey.ca/city- services/16669.aspx
For questions regarding the current construction along Gilley Street and Gordon Avenue, please contact: Victor Jhingan Project Supervisor, Engineering Department Phone: (604) 591-4339 E-mail: VJhinghan@surrey.ca
For questions regarding the future construction along O’Hara Lane, McBride Avenue, Agar Street, and Gardiner Street please contact:
Sarb Attwal Project Supervisor, Engineering Department Phone: (604) 591-4884 E-mail: SAttwal@surrey.ca
For more information on additional project phasing or the overall concept, please contact: Carrie Baron, P.Eng. Drainage Manager, Engineering Department Phone: (604) 591-4278 E-mail: CABaron@surrey.ca
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