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

In this research project Mannings and Chezys 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. Chezys constant is directly proportional to discharge While Mannings constant in inversely proportional to actual discharge. The Mannings and Chezys roughness coefficient of different aggregate sizes were determined using the various notches. The experimental value of Mannings coefficient with the standard value of aggregates given in Mannings roughness table was evaluated. And also the relationship of Mannings 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 mannings constant.