Two other projects underway in north Ballard
Seattle Public Utilities has released an update on the Ballard Natural Drainage System project.
SPU reported that they have received construction bids and plan to go with a construction contract by the end of the month.
The Ballard Natural Drainage System is a project undertaken by the City with a goal of preventing 1 million gallons of untreated sewage and stormwater from entering Salmon Bay by building rain beds in a northern quadrant of Ballard.
SPU plans to build raingardens along 22 city blocks in Ballard. SPU found that the raingardens reduced peak flow rates by over 80 percent and reduced the amount of overflow into Salmon Bay.
Back in 2013 preferred blocks were identified after public outreach and initial investigations that analyzed infrastructure and soil composition.
The end goal of the project is to prevent no more than one overflow per year. The overflows happen when storm water runoff overwhelm Ballard’s combined overflow sewage system. Millions of gallons of runoff enter Salmon Bay via overflow sites. 10 percent of that water is raw sewage.More ›