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*''A<sub>i</sub> = Impervious contributing drainage area (m<sup>2</sup>)
*''A<sub>i</sub> = Impervious contributing drainage area (m<sup>2</sup>)
*''A<sub>p</sub> = Permeable pavement area (m<sup>2</sup>)
*''A<sub>p</sub> = Permeable pavement area (m<sup>2</sup>)
*''f''' = [[Design infiltration rate]] of underlying native soil (m/hr)
*''f''' = [[Design infiltration rate]] of underlying native soil (m/hr)
*''C'' = Runoff coefficient of impermeable pavement (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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