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For designs that include an underdrain, the maximum depth of the stone reservoir below the invert of the underdrain pipe can be calculated as follows:
For designs that include an underdrain, the maximum depth of the stone reservoir below the invert of the underdrain pipe can be calculated as follows:
<math>d_{max} = \frac{q' \times t}{Vr}</math>
<math>d_{max} = \frac{q' \times t}{V_{R}}</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''d<sub>max</sub>'' = Stone reservoir depth (m)
*''d<sub>max</sub>'' = Stone reservoir depth (m)
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When sizing the area of permeable paving based on the contributing drainage area, the following equation may be used:
When sizing the area of permeable paving based on the contributing drainage area, the following equation may be used:
<math>A_p= \frac{Q_c\times A_c}{Vr \times dp – P + q\times T}</math>
<math>A_p= \frac{Q_c\times A_c}{Vr \times dp – P + q'\times t}</math>
[[category:modeling]]
[[category:modeling]]