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*''D'' = Duration of the design storm event event (hr)
*''D'' = Duration of the design storm event event (hr)
*''i'' = Intensity of the design storm event (m/hr)
*''i'' = Intensity of the design storm event (m/hr)
*''R'' = ''A<sub>i</sub>''/''A<sub>p</sub>''; the ratio of impervious contributing drainage area (''A<sub>i</sub>'') to permeable pavement area (''A<sub>p</sub>''). Note that the contributing drainage area should not contain pervious areas. R should not normally exceed 2.
*''R'' = ''A<sub>i</sub>''/''A<sub>p</sub>''; the ratio of impervious contributing drainage area (''A<sub>i</sub>'') to permeable pavement area (''A<sub>p</sub>''). Note that the contributing drainage area should not contain pervious areas. R should not exceed 2.
*''f''' = [[Design infiltration rate]] of underlying native soil (mm/hr)
*''f''' = [[Design infiltration rate]] of underlying native soil (mm/hr)
*''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]])}}