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*Step 2: Select an underdrain pipe diameter (typically 100 - 200 mm), assign this as an 'embedding' depth.   
 
*Step 2: Select an underdrain pipe diameter (typically 100 - 200 mm), assign this as an 'embedding' depth.   
 
*Step 3: Calculate the maximum possible storage reservoir depth beneath the pipe (''d<sub>s</sub>''):
 
*Step 3: Calculate the maximum possible storage reservoir depth beneath the pipe (''d<sub>s</sub>''):
<math>d_{s}=f'\times38.4</math>
+
<math>d_{s}=\frac{f'\times 96}{0.4}</math>
 
{{Plainlist|1=Where:
 
{{Plainlist|1=Where:
 
*''f''' = Design infiltration rate in mm/hr, and
 
*''f''' = Design infiltration rate in mm/hr, and
*38.4 comes from multiplying desired drainage time of 96 hours by void ratio of 0.4}}
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*96 is the desired drainage time in hours
 +
*0.4 is the void ratio of [[reservoir gravel|clear stone]]}}
    
===Additional step for system without underdrain===
 
===Additional step for system without underdrain===
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