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The equation for the depth of the stone foundation (d<sub>f, max</sub>) is as follows:
The equation for the depth of the stone foundation (d<sub>f, max</sub>) is as follows:
<math>d_{f, max}= \frac{[Q_c\times R + P - f'\times t ]}{V_{R}}</math>
<math>d_{f, max}=\frac{\left[\left ( Q_c\times R \right )+ P-\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 (m)
*''Q<sub>c</sub>'' = Depth of runoff from contributing drainage area, not including permeable paving surface (m)