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<math>\frac{Q_{max, p}=L\times B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot \sum d}}{1000}</math>
<math>\frac{Q_{max, p}=L\times B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot \sum d}}{1000}</math>
{{Plainlist|1=Where:<sub>d</sub>'' is the coefficient of discharge (0.61 for a sharp edged orifice),
{{Plainlist|1=Where:
*''L'' is the length of perforated pipe (m)
*''L'' is the length of perforated pipe (m)
*''B'' is the clogging factor (between 0.5 to calculate a for matured installation and 1 to calculate a new perfectly performing BMP),
*''B'' is the clogging factor (between 0.5 to calculate a for matured installation and 1 to calculate a new perfectly performing BMP),