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===For partial infiltration design, to calculate the depth of the storage reservoir needed below the invert of the underdrain pipe===
===For partial infiltration design, to calculate the depth of the storage reservoir needed below the invert of the underdrain pipe===
−For designs that include an underdrain, the depth of the storage reservoir below the invert of the underdrain pipe (''d<sub>r'') can be calculated as follows:
+For designs that include an underdrain, the depth of the storage reservoir below the invert of the underdrain pipe (''d<sub>r'') can be calculated as follows:<br>
<math>d_{r}=\frac{f'\times t}{n}</math>
<math>d_{r}=\frac{f'\times t}{n}</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where: