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Line 169:
Line 169: − Note that narrow, linear bioretention features (or [[bioswales]]) drain faster than round or blocky footprint geometries. + Line 181:
Line 181: − The drainage time calculator noted above can be used to calculate drainage time assuming three dimensional drainage as well.+ +
→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 textured native subsoils with rapid infiltration.
Typically, this is only worth exploring over sandy textured native subsoils with rapid infiltration.
The drainage time calculator noted above can be used to calculate drainage time assuming three dimensional drainage as well.
*Begin the drainage time calculation by dividing the area of the practice (''A<sub>p</sub>'') by the perimeter (''x'')
*Begin the drainage time calculation by dividing the area of the practice (''A<sub>p</sub>'') by the perimeter (''x'')
*''x'' is the perimeter of the practice (m), and
*''x'' is the perimeter of the practice (m), and
*''d<sub>r</sub>'' is the depth of the storage reservoir (m).}}
*''d<sub>r</sub>'' is the depth of the storage reservoir (m).}}
Note that narrow, linear bioretention features (or [[bioswales]]) drain faster than round or blocky footprint geometries.
===Groundwater mounding===
===Groundwater mounding===