Powerhouse Intake Gate Catapult Study, Big Bend Dam, South Dakota, and Stockton, Harry S. Truman, and Clarence Cannon Dams, Missouri. Hydraulic Model Investigation.
Final rept. Dec 73-Jan 76,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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Tests were conducted to determine the range of gate openings and hydraulic conditions at which the service gates at Big Bend, Stockton, and Clarence Cannon powerhouses can be used for watering-up the scroll case area. The test data should also be applicable to Harry S. Truman powerhouse. Measurements of gate catapult heights, uplift forces, discharge coefficients, and pressures throughout the system were made for various gate openings and pool elevations. Although the model gate was suspended from a wire cable, cable stretch and tension were not simulated. Also, roller bearing and seal friction were somewhat greater in the model than in the prototype. The discharge coefficients that were measured for flow underneath the gate were about as expected. However, the discharge coefficients for the back-of-gate orifices were considerably higher than had been expected. The pressures measured at various locations in the penstock, on the gate, and in the scroll case area were not indicative of a blow due to water hammer, although there was a pronounced change in pressures at the time when the scroll case became full and flow started up the gate slot. The pressures measured underneath the gate on the bottom structural member could not be directly related to the uplift force. Although the data could not be generalized for specific design criteria, conclusions are given which can be used as guidance for design of intake gates.
- Civil Engineering