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Hydraulic Model Studies of Toa Vaca Dam Spillway - Puerto Rico Water Resources Authority

G. L. Beichley

A 1:48 scale model was used to develop the hydraulic design of the spillway at Toa Vaca Dam, Puerto Rico. The spillway consists of an approach channel, a gate structure with three 30- by 33.38-ft (9.14- by 10.17-m) radial gates, a sloping chute, a combination stilling basin and flip bucket, and a discharge channel. The spillway is designed for a maximum discharge of approximately 77,000 cfs (2,180 cms). Energy is dissipated by hydraulic jump for low discharges and by flip-out for high discharges. The model included the entire spillway with approach and discharge channels, reservoir topography extending approximately 600 ft (182.88 m) upstream from the dam, and river channel topography extending approximately 600 ft (182.88 m) downstream from the stilling basin. Model studies included investigation of approach flow conditions, distribution of flow through the gates, water surface profiles, discharge coefficients, pressures on the crest, pressures in the stilling basin, flow characteristics in the combination stilling basin-flip bucket, and erosion in the discharge channel. Details of the testing and recommended modifications prompted by the testing are described. (Author)