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→Sizing with an underdrain pipe
*38.4 comes from multiplying desired drainage time of 96 hours by void ratio of 0.4}}
*38.4 comes from multiplying desired drainage time of 96 hours by void ratio of 0.4}}
==Sizing without an underdrain pipe==
# Determine what the planting needs are and assign appropriate depth of media.
# Determine what the pipe diameter needs to be and assign appropriate depth of reservoir.
# Determine maximum possible storage reservoir depth (''d<sub>S</sub>''):
<math>d_{S}=f'\times38.4</math>
{{Plainlist|1=Where:
*''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}}
''Then''