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Manufacturers of perforated pipe are often able to provide the open area (m<sup>2</sup>) per meter length.
Manufacturers of perforated pipe are often able to provide the open area (m<sup>2</sup>) per meter length.
<math>Q_{max, p}=B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot \left ( d_{p} + d_{m} \right )}</math>
<math>Q_{max, p}=B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot \sum d+}</math>
{{Plainlist|1=Where:
*''K<sub>m</sub>'' is the hydraulic conductivity of the filter media (mm/hr),
*''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>),
*''d<sub>p</sub>'' is the depth of ponding (mm),
*''d<sub>m</sub>'' is the depth of the filter media (mm), and
*''Σ d+'' is the total depth of bioretention components over the perforated pipe (mm) (e.g. ponding/[[mulch]]/[[filter media]]/[[choker layer]]),
}}