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→Size a bioretention cell for constrained depth
{{:Depth to GW}}
{{:Depth to GW}}
If there is a constraint to the depth (''d<sub>T</sub>'') of the bioretention practice calculate the require facility area or footprint where the depth is constrained, as:
If there is a constraint to the depth (''d<sub>T</sub>'') of the bioretention practice calculate the require facility area or footprint where the depth is constrained, as:
<math>A_{p}=\frac{A_c\times i\times D}{(V_{R}\times d_{T})+(f'\times)D}</math>
<math>A_{p}=\frac{A_c\times i\times D}{(V_{R}\times d_{T})+(f'\timesD)}</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''A<sub>p</sub>'' = Area of the infiltration practice in m<sup>2</sup>
*''A<sub>p</sub>'' = Area of the infiltration practice in m<sup>2</sup>
*''i'' = Intensity of design storm in mm/hr
*''i'' = Intensity of design storm in mm/hr
*''f''' = [[design infiltration rate]] in mm/hr
*''f''' = [[design infiltration rate]] in mm/hr
*''V<sub>R</sub>'' = Void ratio (porosity), as measured (or default to 0.35 for all aggregates)
*''V<sub>R</sub>'' = Mean void ratio of the fill within the practice
*''d<sub>T</sub>'' = Total depth of the infiltration practice in m.}}
*''d<sub>T</sub>'' = Total depth of the infiltration practice in m.}}