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Seattle Public Utilities
Millions of gallons of runoff enter Salmon Bay via overflow sites. 10 percent of that water is raw sewage. In 2013, Ballard accounted for over one-third of the entire City’s overflows. That year Ballard overflowed 58 times, totaling 14.9 million gallons. Raingardens will mitigate the overflows.

Ballard NDS proposal underway; SEPA determined non-significant

The Ballard Natural Drainage System (BNDS) project made progress last week with Seattle Public Utilities issuing a Determination of Non-Significance (DNS) for environmental impact.

Seattle Public Utilities, the lead agency for this proposal, has determined that the project does not have a probable significant adverse impact on the environment.

The DNS is a step needed for the BNDS proposal to move forward. The proposed project is for construction of raingardens along 22 city blocks in Ballard. The project has been in the design phase (second phase) since last year. Last September the Ballard News-Tribune wrote an update on the project, which revealed that the first phase of the project tested stormwater mitigation with raingardens. SPU found that the raingardens reduced peak flow rates by over 80 percent and reduced the amount of overflow into Salmon Bay. Then later in 2013 preferred blocks were identified after public outreach and initial investigations that analyzed infrastructure and soil composition.

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