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IJSTR >> Volume 5 - Issue 3, March 2016 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Determination Of Chezys And Mannings Coefficient For Different Aggregate Bed Using Different Notches In Hydraulic Bench

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Bashir Muhtar, Manal M. A. Albayati



Open channel flow, coefficients of resistance, Manning’s coefficient, Chezy’s coefficient and Discharge coefficient.



In this research project, Manning’s and Chezy’s constant were determined and compared, using four different notches with different coarse aggregate beds. The coarse aggregates sizes used are 10mm sized coarse aggregate, 20mm sized coarse aggregate, 40mm sized coarse aggregate, and 50mm sized coarse aggregate. Notches that were used in this experiment were the rectangular notch, trapezoidal notch, 90° V-notch and 60° V-notch. The experiment was carried out in the open channel Laboratory by using hydraulic bench, It was seen that, discharge coefficient varies indirectly with actual discharge. Chezy’s constant is directly proportional to discharge While Manning’s constant in inversely proportional to actual discharge. The Manning’s and Chezy’s roughness coefficient of different aggregate sizes were determined using the various notches. The experimental value of Manning’s coefficient with the standard value of aggregates given in Manning’s roughness table was evaluated. And also, the relationship of Manning's n with flow velocity, bed slope, and hydraulic radius were studied. The flow rate was measured straightforward since the procedures are obvious. The challenging phenomenon was determination of points where depth develops. The coefficient of resistance is more adaptable and accurate in manning’s constant.



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