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→Calculate the maximum overall depth
*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>''):
*Step 3: Calculate the maximum possible storage reservoir depth beneath the pipe (''d<sub>s, max</sub>''):
<math>d_{s, max}=\frac{f'\times '}{0.4}</math>
<math>d_{s, max}=\frac{f'\times t}{0.4}</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''f''' = Design infiltration rate (mm/hr), and
*''f''' = Design infiltration rate (mm/hr), and