The lower reservoir dam is the bigger of the two and is 102 m (335 ft) tall and 332 metres (1,089 ft) long. It contains 2,300,000 cubic metres (3,000,000 cu yd) of fill and is 12 m (39 ft) wide at its crest and 360 metres (1,180 ft) wide at its base. Its reservoir has a storage capacity of 6,874,709 m 3 (5,573 acre⋅ft) (of which 3,600,000 cubic metres (2,900 acre⋅ft) is active or usable) and a surface area of 141 km 2 (54 sq mi). The upper dam's has a maximum discharge capacity of 203 m 3/s (7,169 cu ft/s) and the lower: 198.25 cubic metres per second (7,001 cu ft/s).Įach of the dams are equipped with a chute staircase spillway. The normal elevation for the upper reservoir is 2,406.5 m (7,895 ft) and the lower 1,905.4 metres (6,251 ft) which affords a gross maximum hydraulic head of 520 m (1,706 ft) and normal of 504 metres (1,654 ft). Ĭonnecting the upper reservoir to the power station is an intake which feeds water into two 5.7 metres (19 ft) diameter head-race tunnels.
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