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→Size a bioretention cell with no underdrain for constrained ground area
Then calculate the required depth (''d<sub>T</sub>''), as:
Then calculate the required depth (''d<sub>T</sub>''), as:
<math>d_{T}=\frac{D \left[ (R\times i)-f'\right]}{n}</math>
<math>d_{T}=\frac{D \left[ (R\times i)-f'\right]}{n'}</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''D'' = Duration of design storm in hrs
*''D'' = Duration of design storm (h)
*''i'' = Intensity of design storm in mm/hr
*''i'' = Intensity of design storm (m/h)
*''f''' = Design infiltration rate in mm/hr
*''f''' = Design infiltration rate (m/h)
*''n'' = 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>'' = Depth of infiltration practice in m.}}
*''d<sub>T</sub>'' = Total depth of infiltration practice (m).}}
The following equations assume that infiltration occurs primarily through the base of the facility.
The following equations assume that infiltration occurs primarily through the base of the facility.
They may be easily applied for any shape and size of infiltration facility, in which the reservoir storage is filled with aggregate.
They may be easily applied for any shape and size of infiltration facility, in which the reservoir storage is filled with aggregate.