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→Select a surface ponding depth to begin sizing with:
*48 = Maximum permissible drainage time for ponded water (h)
*48 = Maximum permissible drainage time for ponded water (h)
*Note that in designs without underdrains, conceptually the drainage of ponded water is limited by infiltration through the base of the practice.}}<br>
*Note that in designs without underdrains, conceptually the drainage of ponded water is limited by infiltration through the base of the practice.}}<br>
For practices with underdrains see recommended maximum ponding depths for each filter media blend in the table above.
For practices with underdrains see recommended maximum ponding depths for each filter media blend in the table above.<br>
* Step 3: Select a design surface ponding depth, d<sub>p</sub>' (m) to begin sizing with<br>
* Step 3: Select a design surface ponding depth, d<sub>p</sub>' (m) to begin sizing with<br>
For practices with soft (i.e. landscaped) edges and bowl-shaped ponding areas calculate the mean ponding depth:
For practices with soft (i.e. landscaped) edges and bowl-shaped ponding areas calculate the mean ponding depth: