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Bioretention: Sizing
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Revision as of 15:38, 21 April 2020
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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.
Line 89:
Line 89:
[[file:Hydraulic radius.png|thumb|Two practice areas of 9 m<sup>2</sup>.<br> P = 12 m (left), P = 20 m (right)]]
[[file:Hydraulic radius.png|thumb|Two practice areas of 9 m<sup>2</sup>.<br> P = 12 m (left), P = 20 m (right)]]
In some situations, it may be desirable to reduce the size of the bioretention required, by accounting for rapid drainage.
In some situations, it may be desirable to reduce the size of the bioretention required, by accounting for rapid drainage.
−
Typically, this is only worth exploring over sandy
soils
with rapid infiltration.
+
Typically, this is only worth exploring over sandy
textured native subsoils
with rapid infiltration.
Note that narrow, linear bioretention features (or [[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.
Dean Young
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