Innovative Design for Diversion

by A. V. Sundaram, Harza Engineering, Chicago, United States,

Document Type: Proceeding Paper

Part of: Waterpower '91: A New View of Hydro Resources


A conventional diversion scheme to facilitate construction of the 120 m high rockfill dam for the Beni Haroun project in Algeria would have required three 10 m diameter diversion tunnels. Although two of the diversion tunnels could have been converted into low-level outlet works the third would have to be plugged and abandoned. To minimize the construction cost and time, a scheme of diverting dry season flows through a channel and/or tunnels and passing wet season flows over the partially constructed dam was devised. The scheme included two 8 m diameter tunnels and a 40 m high roller compacted concrete (RCC) toe dam incorporated into the downstream shell of the rockfill dam. The RCC toe dam serves as temporary spillway and protects the dam fill against erosion resulting from wet season flow over the partially completed dam.

Subject Headings: Tunnels | Seasonal variations | Channel flow | Concrete dams | Innovation | Infrastructure construction | Earthfill dams | Rockfill dams

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