Longshou II Dam

The Longshou II Dam, also referred to as Longshou No. 2, is a concrete-face rock-fill dam on the Heihe River, located 35 km (22 mi) southwest of Zhangye in Gansu Province, China. It is part of the Gansu Heihe Rural Hydropower Development and supports a 157 MW power station.[3] The dam's first feasibility study was carried out in 2000 and river diversion construction began in December 2001. In June 2002, the river was diverted and in September that year, filling of the dam's body began. On 17 August 2004, the first generator was operational with the rest by the end of the year. The 146.5 m (481 ft) high dam withholds a reservoir with a capacity of 86,200,000 m³ (69,883 acre⋅ft). It's spillway is located on the right bank and is a controlled chute type with a discharge capacity of 2,696 m³/s (95,208 cu ft/s).[4] Water is delivered to the dam's power station downstream via a 1.7 km (1 mi) long tunnel.[5] The dam is located upstream of the Longshou I Dam, an 80 m (262 ft) tall double-curvature arch dam with an installed capacity of 52 MW.[6] Upstream is the Xiaogushan Dam, a gravity dam which diverts water to a 102 MW power station.[3]

Longshou II Dam
Location of Longshou II Dam in China
Country	China
Location	Zhangye
Coordinates	38°45′24″N 100°06′03″E
Status	Operational
Construction began	2002
Opening date	2004
Construction cost	$153 million USD
Owner(s)	Gansu Hexi Hydropower Development Investment Co., Ltd.
Dam and spillways
Type of dam	Embankment, concrete-face rock-fill
Impounds	Heihe River
Height	146.5 m (481 ft)
Length	191 m (627 ft)
Elevation at crest	1,924.5 m (6,314 ft)
Dam volume	2,530,000 m3 (3,309,115 cu yd)
Spillway type	Controlled chute
Spillway capacity	2,696 m3/s (95,208 cu ft/s)
Reservoir
Total capacity	86,200,000 m3 (69,883 acre⋅ft)[1]
Normal elevation	1,920 m (6,299 ft)
Power Station
Commission date	2004
Turbines	3 x 45 MW 1 x 22 MW Francis-type[2]
Installed capacity	157 MW
Annual generation	528 GWh