Tsawwassen Integrated Stormwater Management Plan

Overview

The City of Delta is developing an Integrated Stormwater Management Plan (ISMP) for the Tsawwassen area.  Delta is working with Associated Engineering’s (AE) environmental scientists and water resources engineers to complete this ISMP. 

The fundamental purpose of the Tsawwassen Area ISMP is to maintain and enhance the overall health of the watersheds (in terms of environmental and community values) in the study area, while addressing drainage and local flood protection requirements to allow for future development.

Public Consultation

Delta would like to invite you to provide feedback on the current goals and development plans of this Tsawwassen Area ISMP.  As this plan will be prepared to serve your community, your input is critical to the success of this undertaking to ensure all local expertise and ideas are considered.  Your input will help our team protect and manage the Tsawwassen area community and environment. 

Please find the survey here. We look forward to your critical feedback on our plan, and will address all comments during the preparation of this ISMP. 

City of Delta is also holding a Public Open House/Information session for this ISMP, scheduled for April 17th, 2018 from 6:00pm to 8:00pm at Harris Barn, located at 4140 Arthur Drive, Delta, BC V4K 1A7. All interested persons are welcome. We look forward to seeing you there.

Tsawwassen Area ISMP

City of Delta is developing an Integrated Stormwater Management Plan (ISMP) for the Tsawwassen area.  Delta is working with Associated Engineering’s (AE) environmental scientists and water resources engineers to complete this ISMP. 

The fundamental purpose of the Tsawwassen Area ISMP is to maintain and enhance the overall health of the watersheds (in terms of environmental and community values) in the study area, while addressing drainage and local flood protection requirements to allow for future development.

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Study Area Overview

The study area for the Tsawwassen Area Integrated Stormwater Management Plan (ISMP) is located in South Delta and is generally bounded by 28th Avenue to the north; the Strait of Georgia to the west; Boundary Bay to the east; and Point Roberts to the south. The study area is approximately 2,050 ha and has three drainage pump stations; 12th Avenue Pump Station, Brandrith Pump Station, and 3rd Avenue Pump Station. The majority of the study area is serviced by these pump stations. However, an area of approximately 135 ha on the western bluff above the Strait of Georgia (Roberts Bank) drains directly via gravity outfalls.

Generally, the upland areas are occupied by residential and commercial developments, while the lowland areas are utilized for agriculture, residential areas adjacent to Boundary Bay, and ecological reserves.

Map 1 illustrates the extents of the study area.

The City does not foresee a significant increase in overall development for the study area, however, some redevelopment of commercial properties and densification of existing residential areas may occur. This can result in rainfall running off at a faster rate that can lead to drainage problems as well as flooding in the lowlands, if not properly managed. In addition, climate change will likely significantly increase the intensity of rainfall, and consequently the volume of stormwater runoff. Understanding these possibilities and planning for them so that a healthy watershed can be maintained is essential, and is the basis for this ISMP.

Delta’s overall goals for this ISMP are to:

  • Compose a future vision for the watershed that marries the interests of Engineering, Planning, Environment and Recreation.
  • Identify and address drainage problems to minimize risk to the public and property from flooding.
  • Quantify the overall health and natural features of the watershed.
  • Protect watercourses and aquatic life.
  • Prevent pollution and maintain / improve water quality.
  • Protect and enhance the environment, wildlife and habitat corridors.
  • Identify areas of existing and future residential, commercial, recreational and agricultural land uses (per Delta’s OCP).
  • Inform stakeholders of the issues and objectives of the ISMP.
  • Develop a comprehensive and cost effective strategy for municipal capital improvements, potential projects for stream keeper groups and improve community awareness of watershed issues.
  • Develop a cost effective implementation plan.

To achieve these goals, the measures for consideration in the ISMP will include:

  • Preserve existing green space and undeveloped lands.
  • Consider the impact of development within the watershed.
  • Establish measurable indicators of the health of the watershed to identify concerns and be able to implement restorative measures, as required.
  • Evaluate the impacts of climate change.
  • Restore riparian corridors where redevelopment opportunities allow.
  • Maintain and improve watershed biodiversity by supporting the maintenance and enhancement of terrestrial movement corridors.
  • Enhance fisheries habitat through the restoration of degraded habitat by considering fish access, fish presence, fish potential, and inputs to downstream fish habitat.
  • Define and enforce stormwater quality management objectives.
  • Promote the management of rainfall at the source to improve the hydrologic characteristics of the study area by reducing total runoff and peak flows in watercourses.

To date, an inventory and assessment of the existing conditions in the watershed including aquatic and terrestrial habitat has been completed, as well as the state of existing stormwater infrastructure and natural watercourses.  More recently, the project team has completed an analysis of the adequacy of the study area drainage system to identify future upgrade projects, and propose drainage improvements.

Map 2 illustrates the watercourse classifications in the study area as well as the five foreshore habitat types found immediately outside the study area.

Generally, the aquatic habitat of the watercourses in the study area is comprised mainly of man-made, highly modified channelized drainage ditches, channels, and riparian areas, with few natural watercourse features remaining.  Fish presence information is sparse for the study area, but 72 species of fish have been documented in the Roberts Bank subtidal and intertidal marine habitats that are immediately outside the study area, and receive drainage discharges.  The terrestrial environment of the study area can be broken down into four ecosystem classes: agricultural; forest, hedgerow, and riparian; intertidal / mudflats; and commercial / residential.  The study area has the potential to support 104 provincially listed plant species and is rich in wildlife biodiversity, most notably for birds.  Wildlife habitat in the study area is also suitable for small to large mammals, amphibians, reptiles, and turtles.

Map 3 illustrates existing land use in the study area.

As shown above, the majority of the study areas is made up of single family residential development, agricultural space, and designated park land.  In future, some agricultural land and single family residential areas may be developed into medium density residential areas in select locations as shown in Map 4.

Your Input to the ISMP Process

Delta would like to invite you to provide feedback on the current goals and development plans of this Tsawwassen Area ISMP.  As this plan will be prepared to serve your community, your input is critical to the success of this undertaking to ensure all local expertise and ideas are considered.  Your input will help our team protect and manage the Tsawwassen area community and environment. We look forward to your critical feedback on our plan, and will address all comments during the preparation of this ISMP. 

The City has set up a brief survey to collect your comments, which will then be incorporated as the ISMP progresses. The intent of the survey is to gain an understanding of what is important to you in your watershed, so these priorities can be incorporated as the ISMP progresses.

Click here to fill out the Tsawwassen Area ISMP Public Consultation Survey.

A public open house/information session for this ISMP is scheduled for April 17, 2018 at Harris Barn located at 4140 Arthur Drive, Delta BC V4K 1A7 from 6:00 pm to 8:00 pm. All interested persons are welcome.

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