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Line 18:
Line 18: − Calculate the catchment impervious area to practice pervious (footprint) area ratio, R+
→Size a bioretention cell with no underdrain for constrained depth
*''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).}}<br>
If R is greater than 20, consider decreasing catchment impervious area by draining less area to the practice.
==Size a bioretention cell with no underdrain for constrained ground area==
==Size a bioretention cell with no underdrain for constrained ground area==