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→Determine the active storage depth of the practice
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*d<sub>T</sub> = Total depth of the practice, including surface ponding}}<br>
*d<sub>T</sub> = Total depth of the practice, including surface ponding}}<br>
For practices with the underdrain perforated pipe elevated off the bottom of the storage reservoir:<br>
For practices with the underdrain perforated pipe elevated off the bottom of the storage reservoir:<br>
d<sub>a</sub>= Depth of storage reservoir below the invert elevation of the underdrain perforated pipe.<br>
d<sub>a</sub>= Depth of storage reservoir below the invert elevation of the underdrain perforated pipe.<br>
For practices with the underdrain perforated pipe installed on the bottom of the storage reservoir and connected to a riser (e.g., standpipe and 90 degree coupling):<br>
For practices with the underdrain perforated pipe installed on the bottom of the storage reservoir and connected to a riser (e.g., standpipe and 90 degree coupling):<br>
d<sub>a</sub>= Difference between invert elevations of the reservoir bottom and riser outlet (i.e invert elevation of the 90 degree coupling).<br>
d<sub>a</sub>= Difference between invert elevations of the reservoir bottom and riser outlet (i.e invert elevation of the 90 degree coupling).<br>