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<math>d_{r, max}=\frac{\left[\left ( RVC_{T}\times R \right )+ RVC_{T}-\left(f'\times D\right )\right]}{n}</math>
<math>d_{r, max}=\frac{(RVC_{T}\times A_{p}) + (RVC_{T}\times A_{i}\times C) - (f'\times D\times A_{p})}{n}</math>
<math>d_{r, max}=\frac{(RVC_{T}\times A_{p}) + (RVC_{T}\times A_{i}\times C) - (f'\times D\times A_{p})}{n}</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''RVC<sub>T</sub>'' = [[Runoff volume control target]] (m)
*''RVC<sub>T</sub>'' = [[Runoff volume control target]] (m)
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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)
*''A<sub>i</sub> = Impervious contributing drainage area (m<sup>2</sup>
*''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.
*''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 (m/hr)
*''f''' = [[Design infiltration rate]] of underlying native soil (m/hr)