Enhanced Grass Swale

Enhanced grassed swales are gently sloping conveyance channels with a designed underdrain system to filter or infiltrate stormwater runoff as it flows through the channel. Slopes of less than 2 percent are necessary to avoid swale erosion. These are best used along roadways and parking areas in moderate or low density residential or commercial areas.


Courtesy of Pierce County, WSU Extension
From Whole Building Design Guide


From Maryland Stormwater Design Manual (2009)

Open Channels section from SC Coastal Low Impact Development Manual

Click here for entry in SC DHEC's Stormwater BMP Manual.

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