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Two early examples of scientifically designed bioswales for large scale applications are found in the western United States. In 1996 for Willamette River Park in Portland, Oregon a total of 2330 lineal feet of bioswale was designed and installed to capture and prevent pollutant runoff from entering the Willamette River. Intermittent check dams were installed to further abet silt capture, with the outcome of reducing 50 percent of all suspended solids entering the river system.[3]
A second example of a large scale designed bioswale is at the Carneros Business Park, Sonoma County, California. Starting in 1997 the project design team worked with theCalifornia Department of Fish and Game and County of Sonoma to produce a detailed design to channel surface runoff at the perimeter of a large parking area. Surface runoffconsists of building roof runoff, parking lot runoff and overland flow from properties to the north of the project site. A total of two lineal miles of bioswale was designed into the project. The purpose of the bioswale was to minimize runoff contaminants from entering Sonoma Creek. The designed bioswale channel is grass-lined, but almost linear in form. Downslope gradient is approximately four percent and cross-slope gradient is approximately six percent.
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