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===Additional step for system without underdrain===
 
===Additional step for system without underdrain===
*Step 4: Determine maximum permissible ponding depth (''d<sub>p</sub>''):
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* Step 4: Determine maximum permissible ponding depth (''d<sub>p</sub>''):
 
<math>d_{p}=\frac{f'\times48}{0.4}</math>
 
<math>d_{p}=\frac{f'\times48}{0.4}</math>
 
{{Plainlist|1=Where:
 
{{Plainlist|1=Where:
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