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→To calculate the invert of the underdrain from the base of the reservoir
*''V<sub>R</sub>'' = Void ratio for stone bed (typically 0.4 for 50 mm dia. [[reservoir aggregate|clear stone]])}}
*''V<sub>R</sub>'' = Void ratio for stone bed (typically 0.4 for 50 mm dia. [[reservoir aggregate|clear stone]])}}
==To calculate the invert of the underdrain from the base of the reservoir==
===To calculate the invert of the underdrain from the base of the reservoir===
For designs that include an underdrain, the maximum depth of the stone reservoir below the invert of the underdrain pipe (''d<sub>s, max</sub>'') 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 (''d<sub>s, max</sub>'') can be calculated as follows:
<math>d_{s, max}=\frac{f'\times t}{0.4}</math>
<math>d_{s, max}=\frac{f'\times t}{0.4}</math>