A<sub>c</sub> = A<sub>i</sub> + A<sub>p</sub>, and
+
A<sub>r</sub> = A<sub>p</sub> (i.e., assumed that the water storage reservoir area and permeable pavement area are the same)
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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.