Where Does the Rain Go?

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Our project focuses on using green rainwater infrastructure to capture and reuse rainwater in Trout Lake Park. Currently, over 200,000 cubic metres of water are used annually to fill Trout Lake. We’ve developed strategies to collect, filter, and direct water toward the lake to reduce the amount of drinking water required for replenishment.

School:

SFU

Course:

Capstone (EVSC 400)

Instructors:

  • Anna Hippmann

City of Vancouver:

  • Sheri DeBoer
  • Max Scruton

Student Team:

  • Arthur Truong,
  • Bellen Zhang,
  • Caitlin Heide,
  • Liam Mackay

Term:

Fall 2022

Summary

Currently, the City of Vancouver uses an average of 206,000 cubic metres of potable water annually to maintain Trout Lake’s water quality and level. Rainwater entering the park is primarily diverted to the stormwater system, rather than being directed towards the lake. The City’s Rain City Strategy aims to capture and reuse 90% of rainwater by 2050, so we drafted our recommendations with this goal in mind. We used existing reports from the City of Vancouver as well as research from other jurisdictions around the globe to determine what methods would be most beneficial for Trout Lake Park.

We created seven recommendations specific to Trout Lake to assess and treat pollutants while effectively capturing and reusing rainwater. We recommend that the City continue monitoring pollutants; implement new bioretention facilities and expand existing ones; implement new stormwater channels and expand existing ones; install permeable pavers in parking lots; construct cisterns within the park; expand existing wetland; and install a swimming area partition.

These recommendations mean rainwater will be collected from low permeability zones and filtered using natural processes. The water will then be directed towards the lake so that less drinking water is required for replenishment. Our recommendations also encourage the City to gradually reduce the open water areas of Trout Lake, and allow wetlands to take its place. This will bring the park more in line with the Rain City Strategy, while still allowing the public to make full use of Trout Lake.

 

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