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Line 6: − + + + + + − *''D'' = Duration of the design storm event (e.g., 2 hr)
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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{\left[\left ( RVC_{T}\times R \right )+ RVC_{T}-\left(f'\times D\right )\right]}{n}</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''RVC<sub>T</sub>'' = [[Runoff volume control target]] (mm)
*''RVC<sub>T</sub>'' = [[Runoff volume control target]] (m)
Where
<math> RVC<sub>T</sub> = D \times i
*''D'' = Duration of the design storm event event (hr)
*''i'' = Intensity of the design storm event (m/hr)
*''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 normally 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 normally exceed 2.
*''f''' = [[Design infiltration rate]] of underlying native soil (mm/hr)
*''f''' = [[Design infiltration rate]] of underlying native soil (mm/hr)
*''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]])}}