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t = [n<sub>r</sub>' * A<sub>p</sub>/f'*x] * ln[(d<sub>r</sub> + (A<sub>p</sub>/x)/A<sub>p</sub>/x]
t = [n<sub>r</sub>' * A<sub>p</sub>/f'*x] * ln[(d<sub>r</sub> + (A<sub>p</sub>/x)/A<sub>p</sub>/x]
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''n'' is the porosity of the filter media,  
*''n<sub>r</sub>''' is the effective porosity of the storage reservoir fill material(s),  
*''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>),
*''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>),
*''f''' is the design infiltration rate (mm/hr),  
*''f''' is the design infiltration rate of the native soil (mm/h),  
*''x'' is the perimeter of the practice (m), and
*''x'' is the perimeter of the practice (m), and
*''d<sub>T</sub>'' is the total depth of the practice, including the surface ponding depth (m).}}
*''d<sub>r</sub>'' is the depth of the storage reservoir (m).}}


===Groundwater mounding===
===Groundwater mounding===

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