case study

Seattle Public Utilities Partners with Vulcan to Reduce Pollution

"A combination of the root structures of rushes and sedges and the soil systems in the swales filter and clean rainwater runoff."

Swale on Yale

This project uses an innovative partnership to support Seattle’s effort to provide water quality treatment to polluted stormwater runoff and meet the citywide goal of managing 700 million gallons of stormwater with GSI. The cost of this project was about $12 million.   

SPU received a Stormwater Retrofit and Low Impact Development Competitive Grant from the Washington State Department of (Ecology) and a loan from the Washington State Water Pollution Control Revolving Fund Loan Program. Vulcan Inc., a private company, provided technical and professional services and a portion of the funding for design and construction of the project. 

Swale on Yale