Potholes East Canal Headworks Projectby A. V. Sundaram, Harza Engineering, Chicago, United States,
V. J. Zipparro, Harza Engineering, Chicago, United States,
E. Quiring, Harza Engineering, Chicago, United States,
Document Type: Proceeding Paper
Part of: Waterpower '91: A New View of Hydro Resources
The construction of 6.5 MW Potholes East Canal Headworks in Washington required near vertical excavation of about 100 ft (30 m) through the existing earthfill dam founded on columnar basalt. Scheduled construction required the deep excavation to be left exposed for nearly a year prior to resuming construction. Stability and integrity of the excavated slope was successfully maintained by applying slope protection measures including rockbolts, anchors, drain holes, fibrous shotcrete and chain link fabric. Upstream cofferdam and approach channel were excavated under water successfully by utilizing bubbler system and controlled blasting with no significant fishkill or disruption to the operation of the existing irrigation release headworks.
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