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Pilot Drywell Study Pierce County, Washington

by Molly Adolfson, Adolfson Associates, Inc, Edmonds, United States,
Dan Clark, Adolfson Associates, Inc, Edmonds, United States,



Document Type: Proceeding Paper

Part of: Water Resources Planning and Management and Urban Water Resources

Abstract:

Subsurface disposal of stormwater runoff is widely utilized in areas with permeable or porous soils, including the Clover/Chambers Creek (CCC) Basin in central Pierce County, Washington. In 1989, funding was obtained from the Washington Department of Ecology, Tacoma-Pierce County Health Department, and Pierce County Public Works Department to conduct a study evaluating subsurface discharge of stormwater, in particular, to develop alternative drywell designs. The purpose of the study was to develop alternative designs for drywells that could provide improved pollutant removal over existing drywell design. Developing designs that allow stormwater infiltration yet provide pollutant removal was the focus of the study. Three alternative designs were developed, with the intent of providing pollutant removal by sedimentation, as well as providing a measure of spill control.

Subject Headings: Stormwater management | Permeability (soil) | Runoff | Subsurface investigation | Sediment | Pollution | Infiltration

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