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→Determine the active water storage depth of the practice
*d<sub>f</sub> = Depth of filter media (m)
*d<sub>f</sub> = Depth of filter media (m)
*n<sub>f</sub> = Porosity of filter media}}<br>
*n<sub>f</sub> = Porosity of filter media}}<br>
For practices with the underdrain perforated pipe elevated off the bottom of the storage reservoir, the active storage component is the depth of storage reservoir below the invert of the underdrain perforated pipe that can reliably drained within the specified drainage time. The active water storage of the practice can be calculated as :<br>
For practices with the underdrain perforated pipe elevated off the bottom of the storage reservoir, the active storage component is the depth of storage reservoir below the invert of the underdrain perforated pipe that can reliably drained within the specified drainage time. The active water storage of the practice can be calculated as:
<math>d_{a}= f' t </math>
<math>d_{a}= f' t </math>
{{Plainlist|1=Where:
{{Plainlist|1=Where: