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{{Plainlist|1=Where:
{{Plainlist|1=Where:
−
*''B'' is the clogging factor (between 0.5 (for matured installation) and 1 (for a new perfectly performing BMP)),
+
*''B'' is the clogging factor (between 0.5 (for matured installation) and 1 (for a new perfectly performing orifice)),
*''C<sub>d</sub>'' is the coefficient of discharge (usually 0.61 for a plate, or 0.8 for a pipe),
*''C<sub>d</sub>'' is the coefficient of discharge (usually 0.61 for a plate, or 0.8 for a pipe),
*''A<sub>o</sub>'' is the area of the orifice (m<sup>2</sup>),
*''A<sub>o</sub>'' is the area of the orifice (m<sup>2</sup>),