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→Step 1 alternative, accounts for infiltration during a design storm event
===Step 1 alternative, accounts for infiltration during a design storm event===
===Step 1 alternative, accounts for infiltration during a design storm event===
This may be desirable where the practice is located on particularly freely draining soils and/or where the design storm is of longer duration.
To calculate the required practice area (''A<sub>p</sub>'') or footprint where the depth is constrained:
To calculate the required practice area (''A<sub>p</sub>'') or footprint where the depth is constrained:
<math>A_{p}=\frac{A_{c}iD}{V_{R}d+q'D}</math>
:<math>A_{p}=\frac{A_{c}iD}{V_{R}d+q'D}</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where: