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Tailwaters are also subject to changes in traditional flow rate. Some impoundments discharge a consistent amount of water which can disrupt seasonal fluctuations and extreme flow events. On the other hand, hydropeaking, the cyclical increase in discharge below a hydroelectric dam to meet power demands, can rapidly increase tailwater flow rates.
The dam impounds the Hiwassee Lake of 6,000 acres (2,400 ha), and its tailwaters are part of Apalachia Reservoir. At 307 feet (94 m), Hiwassee Dam is the highest overspill dam east of the Mississippi River and is second only to Grand Coulee dam in the nation. [2] At the time it was completed, it was the highest overspill dam in the world. [3] [4]
Melton Hill is a concrete gravity-type dam with an electric power generation capacity of 79 megawatts. The dam is 103 feet (31 m) high and stretches 1,020 feet (311 m) across the Clinch River. [2] The dam is equipped with a 3-bay spillway that has a total discharge of 118,000 cubic feet (3,341 cubic meters) per second. [1]
The Norfork Tailwater is the segment of the North Fork River below Norfork Dam in north central Arkansas. The Norfork Tailwater is about 4.8 miles (7.7 km) long and stretches from the dam below Lake Norfork to the White River at Norfork. The community of Salesville lies approximately 1.5 miles west of the dam on Arkansas Highway 177.
Grand Coulee Dam is a concrete gravity dam on the Columbia River in the U.S. state of Washington, built to produce hydroelectric power and provide irrigation water. Constructed between 1933 and 1942, Grand Coulee originally had two powerhouses.
Brumadinho dam disaster in 2019. The structural failure of tailings dams and the ensuing release of toxic metals in the environment is a great concern. The standard of public reporting on tailings dam incidents is poor. A large number remain completely unreported, or lack basic facts when reported.
The outlet works of the dam have an outflow capacity of 14,790 feet 3 /s (418.8 m 3 /s). [4] Cochiti Dam is operated to bypass all inflow to the lake to the extent that downstream channel conditions are capable of safely bypassing the flow. Flood-control operations are initiated when inflow to the lake is in excess of the downstream channel ...
Nickajack Dam is 81 feet (25 m) high and 3,767 feet (1,148 m) long. Its reservoir has 179 miles (288 km) of shoreline and 10,370 acres (4,200 ha) of water surface. The dam's 10 spillway bays have a combined discharge of 360,000 cubic feet per second (10,000 m 3 /s). The electrical generating capacity of Nickajack is 104 megawatts. [2]