Changes

*''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 storage reservoirs even deeper than those calculated using the above approach, that many not fully drain between storm events, which increases hydraulic head and infiltration rate at the base of the practice. See [[Low permeability soils]] for more information.  

To boost drainage performance on fine-textured, low permeability soils, consider designing storage reservoirs even deeper than those calculated using the above approach, that many not fully drain between storm events, which increases hydraulic head and exfiltration rate at the base of the practice. See [[Low permeability soils]] for more information.  

===Additional step for system without underdrain===

===Additional step for system without underdrain===