Bioretention Systems

Bioretention systems are utilizing natural vegetal systems to remove pollutants from stormwater runoff. The bioretention system, which may consist of a grass buffer strip, sand bed, ponding area, vegetal layers or plants, and soil is designed to treat stormwater sheet flow. Recently, low impact development (LID) has been used as an alternative design for traditional stormwater

Figure 16 Facultative lagoon (from Ref. 43).

management design. The LID is trying to achieve stormwater management controls by fundamentally changing conventional site design to create a friendly environmental design that mimics natural watershed conditions. Bioretention systems can be considered as a LID design. Readers are referred to several web sites, such as

dep/watershedmgtDOCS/BMP_DOCS/bnip2003pdfs/Storniwater_9.1.pdf for more information on bioretention systems.

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