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*''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),
*''C<sub>d</sub>'' is the coefficient of discharge (usually 0.61 for the sharp edge created by relatively thin pipe walls),
*''C<sub>d</sub>'' is the coefficient of discharge (usually 0.61 for the sharp edge created by relatively thin pipe walls),
*''A<sub>o</sub>'' is the total open area of the perforated pipe (m<sup>2</sup>/m),
*''A<sub>o</sub>'' is the total open area per unit length of pipe (m<sup>2</sup>/m),
*''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]]),
*''O'' is the number of orifices per meter of perforated pipe.
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