Tunneling through an Existing Concrete Masonry Dam

by George C. Antonopoulos, Harza Engineering Co, United States,
Vincent J. Zipparro, Harza Engineering Co, United States,



Document Type: Proceeding Paper

Part of: Waterpower '89

Abstract: The Gregory B. Jarvis Hydroelectric Project is located in Upper New York State on the West Canada Creek. Existing facilities include a non-overflow concrete gravity dam, 65 feet long and 82 feet high. Project development plans called for the installation of an intake structure and a 15 foot diameter penstock through the existing dam, and a 2-unit, 9 MW powerhouse, located 200 feet downstream of the dam. Tunneling through the dam for the installation of the penstock and construction of the intake structure had to be performed while maintaining normal operations of the Hinckley Reservoir. A large permanent bulkhead frame with guides, and bulkhead panels were installed using underwater construction techniques at the upstream face of the dam to facilitate the tunneling and concrete placement operations.

Subject Headings: Concrete dams | Water intakes | Tunneling | Masonry | Existing buildings | Underwater construction | Gravity dams | Concrete frames | Infrastructure construction | Rivers and streams | North America | United States | Canada | New York

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