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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 as follows:<br>
Where the storage reservoir depth is fixed or constrained the footprint area of the water storage reservoir, A<sub>r</sub> can be calculated as follows:<br>
<math>A_{r}=\frac{i \times D \times Ai}{(n\times d_{r})+f'D}</math>
<math>A_{r}=\frac{D(i - f')\times A_{c}}{d_{r} \times n}</math>
When sizing the area of permeable paving (A<sub>p</sub>) based on the total contributing drainage area (A<sub>c</sub>) = A<sub>i</sub> + A<sub>p</sub>, 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>
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 (A<sub>p</sub>) based on the total contributing drainage area (A<sub>c</sub>), 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>
Back to [[Permeable pavements]]
Back to [[Permeable pavements]]
[[Category:Calculations]]
[[Category:Calculations]]