b = 6 m So = 0.002 n = 0.015 y = 1.2 m ------------ Flow area A = b × y = 6 × 1.2 = 7.2 m2 Hydraulic radius: R = A/P = 7.2 /(6 + 1.2 + 1.2) = 0.857 m Flow velocity v = (1/n) R2/3S1/2 = (1/0.015) (0.857)2/3(0.002)1/2 = 2.69 m/s Discharge Q = v A = 2.69 × 7.2 = 19.368 m3/s
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