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The equation for the depth of the stone bed is as follows:
The equation for the depth of the stone bed is as follows:
<math>db= [Qc\times R + P - i\times T ] / Vr</math>
<math>d= [Qc\times R + P - i\times T ] / Vr</math>
where:{{plainlist|}}
where:{{plainlist|}}
*''db'' = Stone bed depth (m)
*''d'' = Stone bed depth (m)
*''Qc'' = Depth of runoff from contributing drainage area, not including permeable paving surface(m)
*''Qc'' = Depth of runoff from contributing drainage area, not including permeable paving surface(m)
*''R'' = Ac/Ap = Ratio of contributing drainage area (Ac) to permeable paving area (Ap)
*''R'' = Ac/Ap = Ratio of contributing drainage area (Ac) to permeable paving area (Ap)