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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:
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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:<br>
 
<math>A_{r}=\frac{i \times D \times Ai}{(n\times d_{r})+f'D}</math>
 
<math>A_{r}=\frac{i \times D \times Ai}{(n\times d_{r})+f'D}</math>
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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:

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