de - 2.581m Question 3 (a) A rectangular river is discharging water at a rate of 112 m/s (Fig. Q3a). The width of the ri

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De 2 581m Question 3 A A Rectangular River Is Discharging Water At A Rate Of 112 M S Fig Q3a The Width Of The Ri 1 (401.97 KiB) Viewed 53 times

de - 2.581m Question 3 (a) A rectangular river is discharging water at a rate of 112 m/s (Fig. Q3a). The width of the river is 28m and velocity at A is 11.4 m/s. Hydraulic jump is expected to occur between B and C. It was found that the water depth at B is 20% greater than water depth at A. Calculate: () Water depths at A, B and C: d = 0.351m do 0.421 m (ii) The difference of specific energy between A and C. GA = 6.75m (iii) Type of hydraulic jump. 4.5< fr. 9 (iv) Name the water surface profile type between A and B. E = 2:703m? steady sump as M3 profile (b) An existing channel is to be enlarged to increase its capacity. The enlarged channe! cross-section is shown in Figure Q3b. The existing channel is of concrete construction with a Manning's n = 0.012 and it carries a maximum discharge of 3 m?/s. The new channel will also be constructed with concrete lining with a Manning's n = 0.012. If the total discharge after enlargement is 9 m/s, find the normal depth y. 15 Marks 1.2 m 1.2 m ! Enlarged Channel 1.2 m YA Vyc Jye B Existing Channel A с 1 m Figure Q3a Figure Q3b y = 2.023m