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→To calculate the required storage reservoir footprint area where the depth is fixed or constrained (1D drainage)
<math>d{r} = (\frac{f'}{1000}) \times t </math>
<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>
''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>
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