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→Calculate the maximum overall depth
==Calculate the maximum overall depth==
==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.
*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</sub>''):
*Step 3: Calculate the maximum possible storage reservoir depth beneath the pipe (''d<sub>s</sub>''):
<math>d_{s}=\frac{f'\times 96}{0.4}</math>
<math>d_{s}=\frac{f'\times 96}{0.4}</math>