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→Determine the active storage depth, da of the practice
==Determine the active storage depth, d<sub>a</sub> of the practice==
==Determine the active storage depth, d<sub>a</sub> of the practice==
* Step 4: Determine the active storage depth, d<sub>a</sub> of the practice<br>
* Step 4: Determine the active storage depth, d<sub>a</sub> of the practice<br>
For practices without an underdrain, the active storage depth equals the total depth of the practice, including surface ponding; <br>
For practices without an underdrain, the active storage depth equals the total depth of the practice, including surface ponding:
<math>d_{a}=d_{T}</math>
<math>d_{a}=d_{T}</math>
For practices with the underdrain perforated pipe elevated off the bottom of the storage reservoir:
For practices with the underdrain perforated pipe elevated off the bottom of the storage reservoir: