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Where the storage reservoir depth is fixed or constrained the footprint area of the water storage reservoir, A<sub>r</sub> can be calculated:
<math>A_{r}=\frac{i \times D \times Ai}{(n\times d_{r})+f'D}</math>
When sizing the area of permeable paving based on the contributing drainage area, the following equation may be used:
When sizing the area of permeable paving based on the contributing drainage area, the following equation may be used:
<math>A_p=\frac{Q_c\times A_c}{V_R\times (d_p – P + (q'\times t))}</math>
<math>A_p=\frac{Q_c\times A_c}{V_R\times (d_p – P + (q'\times t))}</math>