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Water flow onto the main spillway is controlled by eight radial (Tainter) gates that have a combined maximum discharge capacity of 270,000 cu ft/s (7,600 m 3 /s) when the lake elevation is 905 feet. Since the sill elevation of the spillway is 813.6 ft (248.0 m), it can only be used at lake elevations above that level. [1]: A5–A6 [11]
Concrete is mostly damaged by the corrosion of reinforcement bars due to the carbonatation of hardened cement paste or chloride attack under wet conditions. Chemical damage is caused by the formation of expansive products produced by chemical reactions (from carbonatation, chlorides, sulfates and distillate water), by aggressive chemical ...
While the height of each step was a constant 5 feet (1.5 m), the width of each step was unique to its respective elevation above sea level. This width varied between 5.5 feet (1.7 m) near the stream bed base at 1,650 feet (500 m) and decreased to 1.45 feet (0.44 m) at an elevation of 1,816 feet (554 m), the base of the spillways and upright panels.
Country: United States: Location: Oroville, California: Coordinates: 1]: Purpose: Water supply, flood control, power: Status: Operational: Construction began: 1961; 63 years ago (): Opening date: May 4, 1968; 56 years ago (): Owner(s): California Department of Water Resources: Dam and spillways; Type of dam: Zoned Earthfill: Impounds: Feather River: Height (foundation): 770 ft (235 m) [2 ...
Concrete has immersed from natural resources into man-made processes; evidence of the use of concrete dates back over 8,000 years ago. Today, many construction companies and concrete manufacturers have cut the use of Portland cement in their mixtures due to its production process emitting significant amounts of greenhouse gases into the atmosphere.
The jet-flow gates, located in concrete structures 180 feet (55 m) above the river and also at the outlets of the inner diversion tunnels at river level, may be used to divert water around the dam in emergency or flood conditions, but have never done so, and in practice are used only to drain water from the penstocks for maintenance. [98]
The earthen lip of the dam fell into the reservoir and brought with it the concrete lining, while what remained of the dam was just 5 feet (1.5 m) above the water level. The upper lake subsided 3 feet (0.91 m) and was displaced about 5 feet (1.5 m) as a result of the ground movement, and the dam's concrete lining cracked and slumped.
On March 27, the bodies of a 35-year-old Mexican national and a 26-year-old Guatemalan national [2] [98] were found inside a red pickup truck 25 feet (7.6 m) below the mid-section of the bridge. [99] On April 5, the body of a 38-year-old Honduran national was recovered from a submerged vehicle. [100]
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