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→Calculate the maximum overall depth
*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 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 reservoir storage depth beneath the underdrain perforated pipe (''d<sub>s, max</sub>'', mm):
<math>d_{s, max}=f'\times t \times 1/n</math>
<math>d_{s, max}=f'\times t \times 1/n</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where: