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Line 137: − + − <math> d_{i}' = (V_{i}/A_{p})- (f'\times D)</math> − {{Plainlist|1=Where: − *V<sub>i</sub> = Infiltration volume target for the design storm event (m<sup>3</sup>) − *A<sub>p</sub> = Surface area of the practice (m<sup>2</sup>), see equations above to calculate for designs that deliver water to a surface ponding area vs. directly to storage reservoir. − *f' = Design infiltration rate of the underlying native soil (m/h) − *D= Duration of design storm (h)<br>
→Determine the required surface area of the storage reservoir
*f' = Design infiltration rate of the underlying native soil (m/h)
*f' = Design infiltration rate of the underlying native soil (m/h)
*D= Duration of design storm (h)<br>
*D= Duration of design storm (h)<br>
If A<sub>r</sub> is greater than A<sub>p</sub>, calculate the design infiltration water storage depth, d<sub>i</sub>', required to capture the infiltration volume target for the design storm:
If A<sub>r</sub> is greater than A<sub>p</sub>, use the value for A<sub>r</sub> as the required footprint area of the practice.
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*Step 9: Calculate the required storage reservoir depth, d<sub>r</sub> (m):
*Step 9: Calculate the required storage reservoir depth, d<sub>r</sub> (m):