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→Sizing without an underdrain pipe
Line 51:
Line 51:
# 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''
*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==
+===Additional step for system without underdrain===
−# Determine maximum permissible ponding depth (''d<sub>P</sub>''):
# Determine maximum permissible ponding depth (''d<sub>P</sub>''):
<math>d_{P}=f'\times19.2</math>
<math>d_{P}=f'\times19.2</math>