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*''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 BMP)),     
 
*''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>/m),  
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*''A<sub>o</sub>'' is the area of the orifice (m<sup>2</sup>),  
 
*''g'' is acceleration due to gravity = 9.81 m/s<sup>2</sup>, and  
 
*''g'' is acceleration due to gravity = 9.81 m/s<sup>2</sup>, and  
*''h'' is the head of water over the centre of the orifice.
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*''h'' is the head of water over the centre of the orifice (m).
 
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