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*''f''' = Design infiltration rate (mm/h), and
 
*''f''' = Design infiltration rate (mm/h), and
 
*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>

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