The following terminology is used in this manual:īioretention cells: Shallow depressions with a designed planting soil mix and a variety of plant material, including trees, shrubs, grasses, and/or other herbaceous plants. The term, bioretention, is used to describe various designs using soil and plant complexes to manage stormwater. However, designs utilizing underdrains provide less flow control benefits.īioretention areas are shallow landscaped depressions, with a designed soil mix and plants adapted to the local climate and soil moisture conditions, that receive stormwater from a contributing area. Where the native soils have low infiltration rates, underdrain systems can be installed and the facility used to filter pollutants and detain flows that exceed infiltration capacity of the surrounding soil. Where the surrounding native soils have adequate infiltration rates, bioretention can help comply with flow control and treatment requirements. To provide effective removal of many stormwater pollutants, and provide reductions in stormwater runoff quantity and surface runoff flow rates. BMP T7.30: Bioretention Cells, Swales, and Planter Boxes
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