Chapter 14, Problem 14.3.3P

QUESTION 14 Consider a gated-controlled overflow spillway with a length of 30 ft and designed for a head of 8 ft. The gate seats on the crest with 8 = 90°. The upstream face of the crest is vertical with the crest elevation at 1000 ft and the elevation of the streambed is 980 ft. Determine the discharge for net gate opening of 3 ft at the design head. O 1270.5 cfs O 1222.3 cfs O 1375.5 cfs O 1175.6 cfs

1. Consider a gated-controlled overflow spillway with a length of 30 ft and designed for a head of 8 ft. The gate seats on the crest with 0= 90°. The upstream face of the crest is vertical with the crest elevation at 1000 ft and the elevation of the streambed is 980 ft. Determine the discharge for net gate openings of 2 ft and 3 ft at the design head. 2. Compute the time of flow in a gutter for the situation in which the spread T1 at the upstream end is 1 ft, which results from the bypass flow from the upstream inlet. The design spread T2 at the second inlet is 5 ft, the gutter slope is S=0.03, and the cross slope is Sx = 0.025. Manning's n=0.016 and the inlet spacing is 200 ft. 3. Compute the flow rate in a gutter section with a design spread of 3 m and cross-slope of Sx=0.025. The gutter slope S=0.01 and Manning's n is 0.016. W B

Cis discharge coefficient for head H. An overflow ogee spillway has six bays each of 8 m clear length and five rounded nose piers (K. sharp edged (K. = 0.2). The upstream face of the spillway is vertical. Compute the discharge that will pass over the spillway at the design head, H, = 3 m. The discharge coefficient for design head C, = 2.1. Also compute the passing discharge over spillway for head over the crest H = 3.45 m. Neglect the approach velocity to the spillway. Discharge coefficients for head other than design head are given below : = 0.01) each of 2.5 m thick. Both the abutments are %3D %3D %3D НІН, CIC. p. 0.6 0.94 0.85 0.98 1.15 1.02 1.50 1.06