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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.
*''f''' is the design infiltration rate (mm/hr),
*''f''' is the design infiltration rate (mm/hr),
*''P'' is the perimeter of the practice (m), and
*''P'' is the perimeter of the practice (m), and
*''d<sub>T</sub>'' is the total depth of the practice, including the maximum surface ponding depth (m).}}
*''d<sub>T</sub>'' is the total depth of the practice, including the surface ponding depth (m).}}
===Groundwater mounding===
===Groundwater mounding===