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*''T'' = Time to fill stone bed (typically 2 hr)
*''T'' = Time to fill stone bed (typically 2 hr)
*''Vr'' = Void ratio for stone bed (typically 0.35 for 50 mm dia. stone)}}
*''Vr'' = Void ratio for stone bed (typically 0.35 for 50 mm dia. stone)}}
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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>dr_{max} = \frac{q \times t}{Vr}</math>
<math>dr_{max} = \frac{q \times t}{Vr}</math>