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→Step 1
To calculate the required facility area or footprint where the depth is constrained:
To calculate the required facility area or footprint where the depth is constrained:
<math>A_{p}=\frac{IiD}{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:
*''V<sub>R</sub>'' = Void ratio (porosity), as measured (or default to 0.35 for all aggregates)
*''V<sub>R</sub>'' = Void ratio (porosity), as measured (or default to 0.35 for all aggregates)
*''A<sub>p</sub>'' = Area of the infiltration practice in m<sup>2</sup>
*''A<sub>p</sub>'' = Area of the infiltration practice 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.}}