Seite - 136 - in Book of Full Papers - Symposium Hydro Engineering

provides a gradual landing of the jet trajectory. In the new chute profile, the elevations of portions of the chute were set 0.6 m (2 ft) above the original elevations, thus reducing the volume of the underlying rock to be removed and reducing construction time. 6.1.2. FCO Spillway Chute Flow Depth and Velocity Analysis Calculations of the flow depth and velocity along the FCO Spillway chute were done initially with a 1-D model. The calculated velocities and flow depths for selected flows along the FCO Spillway chute are shown in Fig. 4. During the release of 8382 m3/s (296,000 ft3/s), the flow depth changed from 7.5 m (24.6 ft) at the end of the outlet structure to about 3.0 m (9.8 ft) near the dentate structures. The corresponding maximum velocity reached about 52 m/s (170 ft/s) near the dentate structures. The flow on the chute remained uniform flow only when the release was lower than 1415 m3/s (50,000 ft3/s). Fig. 4 Variation of flow depth and velocity along Spillway FCO Spillway chute The 1-D models were used to calculate drag force, uplift due to seepage, centrifugal force at vertical curves, and negative pressures at transverse joints. The resulting chute flow properties were passed to other recovery teams to start their design work. The final wall heights along the chute were determined such that the maximum release of 8382 m3/s (296,000 ft3/s) will be fully contained within the 136