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*''O'' is the number of orifices per meter of perforated pipe.
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 per meter length.
<math>Q_{max, p}=B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot \sum d}</math>
<math>Q_{max, p}=B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot \sum d}</math>
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*''g'' is acceleration due to gravity (m/s<sup>2</sup>)
*''g'' is acceleration due to gravity (m/s<sup>2</sup>)
*''Σ d'' is the total depth of bioretention components over the perforated pipe (mm) (e.g. ponding/[[mulch]]/[[filter media]]/[[choker layer]]),
*''Σ d'' is the total depth of bioretention components over the perforated pipe (mm) (e.g. ponding/[[mulch]]/[[filter media]]/[[choker layer]]),
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===Example calculation===
A part used roll of 100 mm diameter perforated pipe appears long enough to use for a stormwater planter project. Upon inspection the pipe is found to have perforations of 8 x 1.5 mm on six sides, repeated every 3 cm along the pipe. To calculate the maximum flow rate, first the open area per meter is calculated:
<math>\frac{0.008 m \times 0.0012 m\times6}{0.03 m }= m^{2}/m</math>