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→Determine the active storage depth of the practice
* Step 5: Calculate the active storage depth of the storage reservoir (''d<sub>a'', mm):<br>
* Step 5: Calculate the active storage depth of the storage reservoir (''d<sub>a'', mm):<br>
For practices with no underdrain, this includes the surface ponding and storage reservoir depth that will reliably drain within the specified drainage time. <br>
For practices with no underdrain, this includes the combined surface ponding and storage reservoir depth that will reliably drain within the specified drainage time. <br>
For practices with an underdrain, this includes only the storage reservoir depth below the invert of the underdrain perforated pipe that will reliably drain within the specified drainage time:
For practices with an underdrain, this includes only the storage reservoir depth below the invert of the underdrain perforated pipe that will reliably drain within the specified drainage time:
<math>d_{a}=(f'\times t \times 1/n)</math>
<math>d_{a}=(f'\times t \times 1/n)</math>