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→Determine the required surface area of the practice
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*d<sub>i</sub> = Infiltration water storage depth (m), see above for equations for with and without underdrain designs
*d<sub>i</sub> = Infiltration water storage depth (m), see above for equations for with and without underdrain designs
*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>
* Step 6: Compare required surface area of the practice to available space.<br>
* Step 6: Compare required surface area of the practice to available space.<br>