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*''C'' = Runoff coefficient of impervious contributing drainage area (e.g., 0.9 for asphalt)
*''C'' = Runoff coefficient of impervious contributing drainage area (e.g., 0.9 for asphalt)
*''n'' = Porosity of the stone bed aggregate material (typically 0.4 for 50 mm dia. [[reservoir aggregate|clear stone]])}}
*''n'' = Porosity of the stone bed aggregate material (typically 0.4 for 50 mm dia. [[reservoir aggregate|clear stone]])}}
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''R'' = ''A<sub>i</sub>''/''A<sub>p</sub>''
''R'' = ''A<sub>i</sub>''/''A<sub>p</sub>''