Bioswales - USDA

BioswalesWhat are Bioswales ? Bioswales are storm water runoff conveyance sys-tems that provide an alternative to storm can absorb low flows or carry runoff fromheavy rains to storm sewer inlets or directly to sur-face waters. Bioswales improve water quality byinfiltrating the first flush of storm water runoff andfiltering the large storm flows they majority of annual precipitation comes fromfrequent, small rain events. Much of the value ofbioswales comes from infiltrating and filteringnearly all of this a bioswaleFor best results, enhance and utilize existing natu-ral drainage swales whenever possible. Existingswales can be enhanced with native plants. Thethicker and heavier the grasses, the better theswale can filter out contaminants. Additionally,subgrade drains and amended soils may be neededto facilitate infiltration. Bioswales2 0 0 and transport large runoff eventsA bioswale featuring native vegetation shows its fall considerations when designing ormaintaining Bioswales : Costs vary greatly depending on size,plant material, and site considera-tions.

notable features,along with the natural drainageway in the background that serves as a bioswale for residential runoff. The USDAis an equal opportunity provider and employer. to the environment? •protects sensitive areas •increases habitat for wildlife by preserving trees and vegetation •protects local and regional water quality by

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