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2. Design a trapezoidal channel to pass a discharge of 10m3/s and the channel will be excavated through rock by blasting. The
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solution Given Trapezoidal Channel discharge Q= 10 m3/see Bottom Slope 1 in 4000 S Yooo Mannings coefficient, n = 0.030 SideBy Mannings formule (Mannings) I AR23 ghz R = Hydraulic radius n R = A ARB S2 10 = 1 0.030 loco Avdy)* (hod) 18.97 е 73 pZ pT 17.6m y = 1.76m B-3.52 m Top width = B+ 8y =T y - 3.52 + 8 x 1.76 IT = 17.6m 2 2 y 2.49 Area = A= (B+vyJy = (3.52 +4 x170]

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