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→Step 1
*''A<sub>c</sub>'' = Area of the catchment in m<sup>2</sup>
*''A<sub>c</sub>'' = Area of the catchment in m<sup>2</sup>
*''d'' = Depth of infiltration practice in m.}}
*''d'' = Depth of infiltration practice in m.}}
==Step 1 alternative==
The whole bioretention is a box of rocks.
To calculate the required practice area (''A<sub>p</sub>'') or footprint where the depth is constrained:
<math>A_{p}=\frac{V}{V_{R}d}</math>
==Step 2==
==Step 2==