Rocky Mountain Project Conceptual Design of Upper Reservoir

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by D. E. Kleiner, Harza Engineering Co, Chicago, United States,
A. H. Stukey, Harza Engineering Co, Chicago, United States,
K. L. Wong, Harza Engineering Co, Chicago, United States,
J. Boknecht, Harza Engineering Co, Chicago, United States,

Document Type: Proceeding Paper

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

Abstract: The 9300 acre-foot upper reservoir for the Rocky Mountain Project will be formed by an 80-ft high ring dam with a crest length of 12,800 feet. Sandstone and shale of the Pottsville formation underlie the reservoir. These units are folded in a doubly plunging syncline which forms a structural basin at the crest of Rock Mountain. Reservoir leakage through the dam will be controlled by a central clay core founded on the Pottsville shale. The Pottsville shale is judged to be sufficiently impermeable for the bottom of the reservoir. Along the southern perimeter of the reservoir where the shale is thin or nonexistent, a 10-foot thick clay blanket, extending from the base of the central clay core to unweathered shale, will be constructed. A weighting berm above the clay blanket will provide structural stability. About 10.7 × 106 cubic yards of earth and rockfill will be placed for the dam. Clayey residual soils, weathered and unweathered shale from required excavation, and sandstone from a quarry west of the dam will be used for the dam construction.

Subject Headings: Reservoirs | Clays | Mountains | Earthfill dams | Shale | Conceptual design | Residual soils | Hydro power | Rocky Mountains

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