Glen Canyon Dam Diversion Tunnel Outlets

by William E. Wagner,

Serial Information: Journal of the Hydraulics Division, 1967, Vol. 93, Issue 6, Pg. 113-134

Document Type: Journal Paper


Operational history and performance of the left diversion tunnel outlets from March, 1963, to July, 1965, are described. In this period about 5,700,000 acre-ft of water was released through the outlets at discharges to 29,600 cfs, velocities to 135 fps, and heads to 360 ft. Extensive abrasive damage to the concrete tunnel lining was experienced early in the operation because of foreign material circulating in a hydraulic jump that formed in the tunnel during relatively small releases; however, after abrasive material was flushed from the tunnel, no significant additional damage to the roughened concrete lining was noted. Progressive cavitation damage was experienced downstream from the gate slots and at surface irregularities in the conduit steel liners. Photographs and sketches of the damaged areas are included. Although sufficient damage was experienced in the structure to require repairs in a permanent installation, the performance verified the soundness of the basic design of the outlets. Probable causes of the damage and precautions to be considered in designing future structures are presented.

Subject Headings: Tunnels | Linings | Canyons | Dams | Water discharge | Erosion | Concrete | Damage (structural)

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