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==Determine the active water storage depth of the practice==
 
==Determine the active water storage depth of the practice==
* Step 4: Identify the active water storage of the practice, d<sub>a</sub><br>
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* Step 4: Identify and calculate the active water storage depth of the practice, d<sub>a</sub><br>
 
For practices without an underdrain, the active water storage components include the surface ponding, mulch and filter media depths (i.e. total depth of the practice).  The active water storage depth of the practice can be calculated as:
 
For practices without an underdrain, the active water storage components include the surface ponding, mulch and filter media depths (i.e. total depth of the practice).  The active water storage depth of the practice can be calculated as:
 
<math>d_{a}=d_{p}'+ (d_{m}\times n_{m}) + (d_{f}\times n_{f})</math>
 
<math>d_{a}=d_{p}'+ (d_{m}\times n_{m}) + (d_{f}\times n_{f})</math>

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