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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.
===Drainage time (3D)<ref>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.</ref>===
===Drainage time (3D)<ref>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.</ref>===
[[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> x = 12 m (left), x = 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 textured native subsoils with rapid infiltration.
Typically, this is only worth exploring over sandy textured native subsoils with rapid infiltration.