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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.
*''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).}}
The drainage time calculator noted above can be used to calculate drainage time assuming three dimensional drainage as well.
===Groundwater mounding===
===Groundwater mounding===