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→Determine the required surface area of the practice
<math>d_{p}'=d_{p, max}</math>
<math>d_{p}'=d_{p, max}</math>
==Determine the required surface area of the practice==
==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 runoff 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>