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→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>
For practices where inflow is directed to a surface ponding area, 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, A<sub>p</sub>, and adjust the ponding depth to limit surface storage to what is required to capture the runoff volume control target.
For practices where inflow is directed to a surface ponding area, 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 and adjust the ponding depth down to limit surface storage to what is required to fully capture the runoff volume control target.
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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):