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*Step 1: Determine what the planting needs are and assign appropriate depth of media, using the table above.  
 
*Step 1: Determine what the planting needs are and assign appropriate depth of media, using the table above.  
 
*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.   
 
*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.   
*Step 3: Calculate the maximum possible storage reservoir depth beneath the pipe (''d<sub>s, max</sub>''):
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*Step 3: Calculate the maximum possible storage reservoir depth beneath the pipe (''d<sub>s, max</sub>'', mm):
 
<math>d_{s, max}=\frac{f'\times t}{0.4}</math>
 
<math>d_{s, max}=\frac{f'\times t}{0.4}</math>
 
{{Plainlist|1=Where:
 
{{Plainlist|1=Where:
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