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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 and adjust the ponding depth down to limit surface storage to what is required to fully 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 design storm runoff volume.
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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):