University green stormwater infrastructure
In 2017-18, this project studied soil, groundwater, surface water flow, and street conditions in the six square mile project study area to identify the best locations for Green Stormwater Infrastructure to be installed. In 2018, the County conducted public outreach to share information about the project and request input on community values around Green Stormwater Infrastructure benefits and challenges, and the balance of benefits and costs the project will consider when choosing how and where to install Green Stormwater Infrastructure in the area. (See Project library.)
Having conducted a major evaluation of the project study area, we are pausing our next steps to ensure that we are aligning with the County’s Clean Water Plan, a system-wide planning effort, which is currently being developed.
We wish to thank everyone who has taken part in our outreach to the community so far. In the meantime, the County continues to commit to Green Stormwater Infrastructure in the project study area through the RainWise rebate program.
King County is beginning a green stormwater infrastructure project in north Seattle. This project would install facilities to help control a combined sewer overflow in Portage Bay. In 2017-18, the project team studied soil, groundwater, surface water flow, and street conditions in the project area to identify the best locations for facilities to be installed.
In this first phase of the project the County will consider what types of green stormwater infrastructure it should build, and where within the study area they should be installed. Some options include different types of bioretention and permeable pavement in alleys or streets. Learn more!
Project study area
The project would select sites for installing green stormwater infrastructure from within the area below.
Click to view more of map .
Approximate boundaries are intended for planning purposes only. Further study and evaluation will be completed prior to selection of any site.
In the University CSO Basin in Seattle, heavy rains can cause sewers to overflow into Portage Bay approximately six times per year. This project will install facilities to help control these overflows. Learn more about King County’s CSOs.
What is green stormwater infrastructure?
Green stormwater infrastructure—also called natural drainage—mimics nature by slowing or reducing polluted runoff close to its source. It also treats polluted runoff from roads, roofs, and parking lots by capturing and cleaning it before it harms our waterways. Learn more!
Visit the public involvement page.
Green stormwater infrastructure installed at a Roosevelt neighborhood church:
The County’s green stormwater infrastructure project in West Seattle:
- Visit the Website for the County’s green stormwater infrastructure project in West Seattle, and read the project’s newsletter update .
- Video about the West Seattle project (Barton Roadside Rain Gardens , 3:00)
- Video: Neighbors discuss the County’s Barton roadside rain gardens , 2:30
The big picture:
- King County’s Clean Water Healthy Habitats Initiative
- King County’s Clean Water Plan
- Green Solutions to Stormwater Runoff , a video by Sightline Institute made in Seattle
- www.700milliongallons.org , all about green stormwater infrastructure
- Many residents of this area can install their own green stormwater infrastructure (rain gardens and cisterns) on their own property funded by an average $4,400 rebate. Check your eligibility and learn more .
The County will consider installing different types of green stormwater infrastructure in the public right-of-way, including types of bioretention in planting strips and permeable pavement in alleys or streets.