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→Determine the required surface area of the practice
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*d<sub>a</sub> = Active storage depth (m)
*d<sub>a</sub> = Active storage depth (m)
*n = porosity of storage reservoir aggregate or effective porosity of void-producing structure system
*n = porosity of storage reservoir aggregate or effective porosity of void-producing structure system (with underdrain) or effective porosity of surface ponding depth and filter media depth combined (no underdrain)
*f' = design infiltration rate of the underlying native soil (m/h)
*f' = design infiltration rate of the underlying native soil (m/h)
*D = Design storm duration (h)}}<br>
*D = Design storm duration (h)}}<br>