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*''f''' = [[design infiltration rate]] in mm/hr
*''f''' = [[design infiltration rate]] in mm/hr
*''n''' = Effective porosity of the fill materials within the practice, depth-weighted mean
*''n''' = Effective porosity of the fill materials within the practice, depth-weighted mean
*''d<sub>T</sub>'' = Total depth available between the elevations of the bottom of the practice and one (1) metre above the seasonally high water table or top of bedrock  (m).}}<br>
*''d<sub>T</sub>'' = Total depth available between the elevations of the bottom of the practice and one (1) metre above the seasonally high water table or top of bedrock  (m) or other value determined to be suitable through groundwater mounding analysis.}}<br>
If R is greater than 20, consider decreasing catchment impervious area (A<sub>i</sub>) by draining less area to the practice.
If R is greater than 20, consider decreasing catchment impervious area (A<sub>i</sub>) by draining less area to the practice.


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