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→Determine the required surface area of the practice
*A<sub>i</sub> = Catchment impervious area (m<sup>2</sup>)
*A<sub>i</sub> = Catchment impervious area (m<sup>2</sup>)
*d<sub>p</sub>' = Design surface ponding depth (m)
*d<sub>p</sub>' = Design surface ponding depth (m)
*f<sub>m, min</sub> = minimum infiltration rate of the filter media (mm/h)}}
*f<sub>m, min</sub> = minimum infiltration rate of the filter media (mm/h), see [[Bioretention filtration media|Filter media]] for guidance}}
==Determine the active storage depth of the practice==
==Determine the active storage depth of the practice==