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3. A rectangular channel has the following properties: b=5m, So=0.005, n=0.017. The flow rate in the channel is 6 m3/sec. At

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Width b 5m Longitudinal slope, Sp 0.005 Mannings n 0.017 Flo rate = 6 m3[sec noamal depth of Alow Say n coos-Secttonal areaBy solving >Gn 0.51 m you get Critical depth of loo Say yc Q2 52 1 9.31 XS D.522 m Specifie energy ata section, E = yt 29 Enevv E R y4 DE SF Ax So-P mm/sm 1.846 0-17O.224 e26s D. O0238 0.65 3.25 0.SI6 2 0.00196 O.0030412.421 O. OSE 0,00IS4 0.153750.S=41.30 4.m y(0.522) Here, yn(o.51) Sc slope of critical Plow vn yc o.S22m, A 2.6 4 m R0436m, V- 2.23m| C2.213)0. 013 Sc 0.436

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