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Manufacturers of perforated pipe are often able to provide the open area per meter length.
Manufacturers of perforated pipe are often able to provide the open area per meter length.
−<math>Q_{max, p}=B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot \sum d}</math>
+<math>Q_{max, p}=L\times B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot \sum d}</math>
{{Plainlist|1=Where:<sub>d</sub>'' is the coefficient of discharge (0.61 for a sharp edged orifice),
{{Plainlist|1=Where:<sub>d</sub>'' is the coefficient of discharge (0.61 for a sharp edged orifice),
+*''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 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),
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<math>\frac{0.008\ m \times 0.0015\ m\times6}{0.03\ m }= 0.0024\ m^{2}/m</math>
<math>\frac{0.008\ m \times 0.0015\ m\times6}{0.03\ m }= 0.0024\ m^{2}/m</math>
Then:
Then:
−<math>Q_{max, p}=0.5\times 0.61\times 0.0024\ m^{2}/m\sqrt{2\cdot 9.81\ m/s^{2}\cdot \sum 1.1\ m}=0.0034\ m^{3}/s</math>
+<math>Q_{max, p}=8\times 0.5\times 0.61\times 0.0024\ m^{2}/m\sqrt{2\cdot 9.81\ m/s^{2}\cdot \sum 1.1\ m}=0.0034\ m^{3}/s</math>
#{3}
#{3}