Consider a concrete ogee spillway with vertical upstream face. The height of the spillway crest is kept at RL 204.0 m. The average river bed level at the site is 100.0 m. The spillway length consists of 6 spans having a clear width of 10 m each. Thickness of each pier is 2.5 m with 90 o cut water nose piers and rounded abutments provided. Determine the discharges for operating heads of 0.75H

e , 0.50H

e and 0.25H

e , where the design head for discharge of 8000 m 3 /s is 16.4m. Comment on the results.

Design an ogee spillway with the following data: (i) Height of spillway crest above river bed = 100 m (ii) Design discharge = 12,000 cumecs (iii) Number of spans = 6 (iv) Clear distance between piers = 15 m (v) Thickness of pier = 3 m Slope of d/s face of the overflow section = 0.8:1 Assume any other data if required.