Line 80:
Line 80:
*''f''' = Design infiltration rate (mm/h), and
*''f''' = Design infiltration rate (mm/h), and
*24 = Maximum permissible drainage time for surface ponded water (h)}}
*24 = Maximum permissible drainage time for surface ponded water (h)}}
−
Note that conceptually, in designs without underdrains, when filled to their maximum storage capacity, drainage of ponded water is limited by the infiltration rate at the base of the practice.<br>
+
Note that conceptually, in designs without underdrains, when filled to their maximum storage capacity, drainage of ponded water is limited by the infiltration rate of the in-situ (native) soil at the base of the practice.<br>
<br>
<br>
For practices with underdrains see recommended range for maximum surface ponding depth in the table above, and consult local design standards where available.<br>
For practices with underdrains see recommended range for maximum surface ponding depth in the table above, and consult local design standards where available.<br>