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*Step 2: Select an underdrain pipe diameter (typically 100 - 200 mm), assign this as an 'embedding' depth. *Note that this component does not apply if a downstream riser is being used to control an extended saturation zone.   
 
*Step 2: Select an underdrain pipe diameter (typically 100 - 200 mm), assign this as an 'embedding' depth. *Note that this component does not apply if a downstream riser is being used to control an extended saturation zone.   
 
*Step 3: Calculate the maximum permissible water storage depth beneath the pipe (''d<sub>s, max</sub>'', mm):
 
*Step 3: Calculate the maximum permissible water storage depth beneath the pipe (''d<sub>s, max</sub>'', mm):
<math>d_{s, max}=f'\times t</math>
+
<math>d_{s, max}=f'\times t divided by n</math>
 
{{Plainlist|1=Where:
 
{{Plainlist|1=Where:
 
*''f''' = Design infiltration rate (mm/hr), and
 
*''f''' = Design infiltration rate (mm/hr), and

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