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{{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 (with underdrain) or effective porosity of surface ponding depth and filter media depth combined (no underdrain)
+
*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 design only)
 
*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>

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