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→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===
===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 storage layer 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>
{{Plainlist|1=Where:
{{Plainlist|1=Where: