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{{Plainlist|1=Where:
{{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 (for matured installation) and 1 (for 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 per unit length of 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),