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Line 146:
Line 146: − − Higher catchment imperviousness may require a larger storage volume, as shown in the chart on the right.
→Volume
*''f''' = design infiltration rate (mm/hr)
*''f''' = design infiltration rate (mm/hr)
*''t'' = [[drainage time|time permitted for ponding to infiltrate]] (hrs) (typically 48 hours)}}
*''t'' = [[drainage time|time permitted for ponding to infiltrate]] (hrs) (typically 48 hours)}}
===Detention time===
===Detention time===