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.

•reduces frequent high and low flows associat-ed with surface runoff, stabilizing stream flow volumes by restoring ground water discharges into receiving waters •may reduce potential for flooding to residents? •increases community character •improves quality of life •more access to trails and open space •pedestrian-friendly to ...

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