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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 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 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 based on the depth of water that will drain via infiltration between storm events. So d<sub>r</sub> can be calculated as <br>:
''d<sub>r</sub> = (f'/1000) * t <br>
<math>''d{r} = (\frac{f'}{1000} \times t </math><br>
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>
t = drainage time, based on local criteria or long-term average inter-event period for the location.<br>
''t'' = drainage time, based on local criteria or long-term average inter-event period for the location.<br>
<br>
<br>
In many locations there may be a limited depth of soil available above the seasonally high water table or top of bedrock elevation into which stormwater may be infiltrated. In such cases the required storage needs to be distributed more widely across the landscape. <br>
In many locations there may be a limited depth of soil available above the seasonally high water table or top of bedrock elevation into which stormwater may be infiltrated. In such cases the required storage needs to be distributed more widely across the landscape. <br>