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==To calculate the required storage reservoir footprint area where the depth is fixed or constrained (1D drainage)==
 
==To calculate the required storage reservoir footprint area where the depth is fixed or constrained (1D drainage)==
 
To ensure that the water storage capacity of the facility is available at the onset of a storm event, it is recommended to size the storage reservoir despth, d<sub>r</sub>, based on the depth of water that will drain via infiltration between storm events. So d<sub>r</sub> can be calculated as <br>:
 
To ensure that the water storage capacity of the facility is available at the onset of a storm event, it is recommended to size the storage reservoir despth, d<sub>r</sub>, based on the depth of water that will drain via infiltration between storm events. So d<sub>r</sub> can be calculated as <br>:
<math>d{r} = (\frac{f'}{1000}) \times t </math><br>
+
<math>d{r} = (\frac{f'}{1000}) \times t </math>
 
Where <br>
 
Where <br>
 
''f''' = design infiltration rate of the native soil (mm/h) <br>
 
''f''' = design infiltration rate of the native soil (mm/h) <br>

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