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→Step 1, total volume
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*''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>
*''A<sub>c</sub>'' = Area of the catchment in m<sup>2</sup>
−*''d'' = Depth of infiltration practice in m.}}
+*''d<sub>T</sub>'' = Total depth of infiltration practice in m (= ''d<sub>b</sub>'' + ''d<sub>m</sub>'' + ''d<sub>R</sub>'')}}
==Step 2, geometry and perimeter==
==Step 2, geometry and perimeter==