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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),     
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*''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),  
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