Changes

*''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>

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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>