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*''P'' = Rainfall depth (mm)
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The equation for the depth of the stone foundation (''d<sub>f, max</sub>'', mm) is as follows:
The equation for the depth of the stone foundation (''d<sub>f, max</sub>'', mm) is as follows:
<math>d_{f, max}=\frac{\left[\left ( Q_c\times R \right )+ P-\left(f'\times t\right )\right]}{V_{R}}</math>
<math>d_{f, max}=\frac{\left[\left ( RVC_{T}\times R \right )+ RVC_{T}-\left(f'\times t\right )\right]}{V_{R}}</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''Q<sub>c</sub>'' = Depth of runoff from contributing drainage area, not including permeable paving surface (mm)
*''RVC<sub>T</sub>'' = Depth of runoff from contributing drainage area, not including permeable paving surface (mm)
*''R'' = ''A<sub>c</sub>''/''A<sub>p</sub>''; the ratio of contributing drainage area (''A<sub>c</sub>'') to permeable paving area (''A<sub>p</sub>''). Note that the contributing drainage area (''A<sub>c</sub>'') should not contain pervious areas. R should not normally exceed 2.
*''R'' = ''A<sub>c</sub>''/''A<sub>p</sub>''; the ratio of contributing drainage area (''A<sub>c</sub>'') to permeable paving area (''A<sub>p</sub>''). Note that the contributing drainage area (''A<sub>c</sub>'') should not contain pervious areas. R should not normally exceed 2.
*''f''' = Design infiltration rate (mm/hr)
*''f''' = Design infiltration rate (mm/hr)
*''t'' = Time to fill stone bed (typically 2 hr)
*''t'' = Time to fill stone bed (typically 2 hr)