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→Step 1, total volume
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''V'' = Required volume of storage in m<sup>3</sup>
*''V'' = Required volume of storage in m<sup>3</sup>
*''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)
*''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>
*''d<sub>T</sub>'' = Total depth of infiltration practice in m = ''d<sub>b</sub>'' + ''d<sub>m</sub>'' + ''d<sub>R</sub>''}}
*''d<sub>T</sub>'' = Total depth of infiltration practice in m (= ''d<sub>b</sub>'' + ''d<sub>m</sub>'' + ''d<sub>R</sub>'')}}
===Step 1 alternative, accounts for infiltration during a design storm event===
===Step 1 alternative, accounts for infiltration during a design storm event===