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→Calculate the maximum overall depth
*''t'' = [[Drainage time]] (hrs). Check local regulations for drainage time requirements; and
*''t'' = [[Drainage time]] (hrs). Check local regulations for drainage time requirements; and
*''n'' = Porosity of the reservoir aggregate}}
*''n'' = Porosity of the reservoir aggregate}}
To boost drainage performance on fine-textured, low permeability soils, consider designing even deeper storage reservoirs that many not fully drain between storm events, which increases hydraulic head and infiltration rate at the base of the practice.
===Additional step for system without underdrain===
===Additional step for system without underdrain===