Capacity
Apalachia Dam is a concrete gravity diversion-type dam 150 feet (46 m) high and 1,308 feet (399 m) long, and has a generating capacity of 93,600 kilowatts. The dam's spillway is controlled by 10 radial gates with a combined discharge of 136,000 cubic feet per second (3,900 m3/s). Apalachia Lake stretches for 9.8 miles (15.8 km) to the base of Hiwassee Dam, and contains 31 miles (50 km) of shoreline and 1,070 acres (430 ha) of water surface.
A 900-foot (270 m) steel penstock connects the reservoir intake at the dam site to the 8.3-mile (13.4 km) conduit. The conduit emerges from a cliffside overlooking the dam's powerhouse, where it splits into two smaller tunnels which carry the water to a valve house. From the valve house, the water drops 200 feet (61 m) through two steel penstocks to the powerhouse turbines below.
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—John Dewey (1859–1952)