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mLine 20:
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→Sizing
*''A<sub>c</sub>'' = Area of the catchment (m<sup>2</sup>)
*''A<sub>c</sub>'' = Area of the catchment (m<sup>2</sup>)
*''f''' = design infiltration rate (mm/hr)
*''f''' = design infiltration rate (mm/hr)
*''t'' = [[drainage time|time permitted for ponding to infiltrate]] (hrs)}}
*''t'' = [[drainage time|time permitted for ponding to infiltrate]] (hrs) (typically 48 hours)}}
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