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Last Updated: Tuesday, April 15, 2008 11:08 AM

Types of BMPS

Bio Filtration Swales and Strips

Biofiltration swales and strips are vegetated areas that remove pollutants from stormwater runoff as it flows through the vegetation. Removal mechanisms include filtration and infiltration. In this study, one biofiltration strip and six swales treat highway runoff, while two strips treat runoff from maintenance yards (for pretreatment for infiltration trenches). Runoff is captured in drain inlets and routed to the swales, while strips receive sheet flow directly from the pavement. Swales are conveyance channels where stormwater flow passes through the grass. Strips are broad surfaces with a grass cover that allows stormwater to flow in relatively thin sheets.

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