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What is the relationship between King Countys and the City of Seattles management of CSOs?

April 26, 2017city csos king county Management relationship Seattle

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What is the relationship between King Countys and the City of Seattles management of CSOs?

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King County and the City of Seattle share management of the CSOs based on the size of the drainage basin served by each CSO outfall. The county manages CSOs from basins greater than 1,000 acres. The City of Seattle’s combined areas make up about 1/3 of the city’s total service area, another 1/3 is partially separated, and 1/3 is separated. Typically, a partially separated area differs from a combined area, in that, the drainage from streets is separated and sent to a storm sewer. Because of the varying amount of separation in the city’s system, King County operates CSO control facilities throughout the city’s service area. The City of Seattle makes up about 21% of King County’s total service area.