Changes

*''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)

*''A_i = Impervious contributing drainage area (m²

*''A_i = Impervious contributing drainage area (m²)

*''R'' = ''A_i''/''A_p''; the ratio of impervious contributing drainage area (''A_i'') to permeable pavement area (''A_p''). Note that the contributing drainage area should not contain pervious areas. R should not exceed 2.

*''R'' = ''A_i''/''A_p''; the ratio of impervious contributing drainage area (''A_i'') to permeable pavement area (''A_p''). Note that the contributing drainage area should not contain pervious areas. R should not exceed 2.

*''f''' = [[Design infiltration rate]] of underlying native soil (m/hr)  

*''f''' = [[Design infiltration rate]] of underlying native soil (m/hr)  

A_c = A_i + A_p

A_c = A_i + A_p

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Then increase A_r accordingly to keep R between 0 and 2, which reduces hydraulic loading and helps avoid premature clogging. This assumes that the water storage reservoir area and permeable pavement area are the same (A_r = A_p).   

Then increase A_r accordingly to keep R between 0 and 2, which reduces hydraulic loading and helps avoid premature clogging. This assumes that the water storage reservoir area and permeable pavement area are the same (A_r = A_p).