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Line 39:
Line 39: NB: The ratio of impervious contributing drainage area (''A<sub>i</sub>'') to permeable pavement area (''A<sub>p</sub>'') ''R'' = ''A<sub>i</sub>''/''A<sub>p</sub>'' should not exceed 2 and A<sub>i</sub> should not contain pervious areas.
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A<sub>c</sub> = A<sub>i</sub> + A<sub>p</sub>
A<sub>c</sub> = A<sub>i</sub> + A<sub>p</sub>
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Then increase A<sub>r</sub> 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<sub>r</sub> = A<sub>p</sub>).
Then increase A<sub>r</sub> 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<sub>r</sub> = A<sub>p</sub>).