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mLine 60:
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→Sizing without an underdrain pipe
*38.4 comes from multiplying desired drainage time of 96 hours by void ratio of 0.4}}
*38.4 comes from multiplying desired drainage time of 96 hours by void ratio of 0.4}}
''Then''
''Then''
# Determine maximum permissible ponding depth (''d<sub>P</sub>''):
<math>d_{P}=f'\times19.2</math>
{{Plainlist|1=Where:
*''f''' = Design infiltration rate in mm/hr, and
*19.2 comes from multiplying desired drainage time of 48 hours by void ratio of 0.4. Note that conceptually the drainage of the ponded area is limited by ex-filtration at the base of the practice.}}