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→Determine the required surface area of the practice
*D = Design storm duration (h)
*D = Design storm duration (h)
*A<sub>i</sub> = Catchment impervious area (m<sup>2</sup>)
*A<sub>i</sub> = Catchment impervious area (m<sup>2</sup>)
*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)}}</math>