*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 can be limited by infiltration through the base of the practice when filled to capacity.<br>
<br>
<br>
For practices with underdrains see recommended maximum surface ponding depth for each filter media blend in the table above.<br>
For practices with underdrains see recommended maximum surface ponding depth for each filter media blend in the table above.<br>