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→Drainage time (3D)Woods Ballard, B., S. Wilson, H. Udale-Clarke, S. Illman, T. Scott, R. Ahsley, and R. Kellagher. 2016. The SuDS Manual. 5th ed. CIRIA, London.
Typically, this is only worth exploring over sandy soils with rapid infiltration.
Typically, this is only worth exploring over sandy soils with rapid infiltration.
Note that narrow, linear bioretention features ([[bioswales]]) drain faster than round or blocky footprint geometries.
Note that narrow, linear bioretention features (or [[bioswales]]) drain faster than round or blocky footprint geometries.
*Begin the drainage time calculation by dividing the area of the practice (''A<sub>p</sub>'') by the perimeter (''P'').
*Begin the drainage time calculation by dividing the area of the practice (''A<sub>p</sub>'') by the perimeter (''P'').