Changes

* Step 2: Determine a maximum surface ponding depth (''d_{p, max}'')

* Step 2: Determine a maximum surface ponding depth (''d_{p, max}'')

For practices without underdrains:

For practices without underdrains:

<math>d_{p, max}=f'\times48</math>

<math>d_{p, max}=f'\times24</math>

{{Plainlist|1=Where:

{{Plainlist|1=Where:

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

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

*48 = 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 at the base of the practice.<br>

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