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→Determine the required surface area of the practice
* Step 4: Calculate the surface (i.e footprint) area of the practice (A<sub>p</sub>) needed to capture the runoff volume produced from the catchment during the design storm event<br>
* Step 4: Calculate the surface (i.e footprint) area of the practice (A<sub>p</sub>) needed to capture the runoff volume produced from the catchment during the design storm event<br>
For practices where flow is delivered to the filter media bed:
For practices where flow is delivered to the filter media bed:
<math>A_{p}=i\times D\times A_{i}/[(d_{p}' + (f_{m, min} \times D)]</math>
<math>A_{p}=i\times D\times A_{i}/[d_{p}' + (f_{m, min} \times D)]</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*i = Design storm intensity (m/h)
*i = Design storm intensity (m/h)