Question

can someone please explain how this question is solved with clear working out.

1a) Using the energy diagram explain the Standard Step method and how this method is used to,calculate water surface profiles in sub-critical flow. First begin by listing the variables whose values are normally known or given) Then using the energy diagram list the calculation method step by step. Explain the gradually varied flow assumption. 1b) A trapezoidal channel with a bottom width of 6 m, side batter slopes (H:V) of 1:3, is on a longitudinal slope of 0.001, with Manning's n 0.015. (i) For a uniform depth of 1.5m, calculate the cross-sectional area, and the wetted perimeter. (ii) Using the Manning equation calculate the discharge in the channel assuming uniform flow. w.P- 2yth A yb 1.5 m 31.5 A w.p 1 ,16 B8 6 m

Answer 1

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7-0 m , umiotm desth CYofsBectional a01ea 글 (a4 6) h A = ) 1H-3 V wSkb ? - 1SV 0.S Horigontal distance fo m dpth oetlel eieter b+ata 6+1.S8+1.S8 Mamng's oquation V= A P 6.17m - -S8 ven 8 = o.00 n :0.01S - xG-1 0.0IS (100)* F09 mls racham nel dachge Q> AV = 9-7S x 09= 69. 13 m%e c 69