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→Determine the active storage depth of the practice
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>
* Step 5: Calculate the active storage depth of the practice (''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 is limited to the depth of the storage reservoir that will reliably drain within the specified drainage time:
For practices with no underdrain, this is limited to the surface ponding and storage reservoir depth 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>
{{Plainlist|1=Where:
{{Plainlist|1=Where: