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→For partial infiltration design, to calculate the depth of the storage reservoir needed below the invert of the underdrain pipe
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*''f''' = Design infiltration rate (mm/hr), and
*''f''' = Design infiltration rate (mm/hr), and
*''t'' = [[Drainage time]] (hrs), e.g. 72 hours, check local regulations for drainage time requirements.
*''t'' = [[Drainage time]] (hrs), e.g. 72 hours, check local regulations for drainage time requirements.
−*''n'' = Porosity of [[Reservoir aggregate|clear stone]]}}
+*''n'' = Porosity of the stone bed aggregate material (typically 0.4 for 50 mm dia. [[reservoir aggregate|clear stone]])}}
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