Subansiri Lower Dam

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The Lower - Subansari Dam, officially called Lower Subansiri Hydroelectric Power Project ( LSHEP ), is one property under construction dam project with a gravity dam as a shut-off on Subansiri, a tributary of the Brahmaputra, in northeastern India. The dam site is 2.3 km upstream of the village in the district of Lower Subansiri Gerukamukh in the Indian state of Arunachal Pradesh.

At the dam a river power plant is being built, which is according to the client NHPC Limited have a rated power of 2000 MW.

The project suffered some setbacks during construction by landslides, rescheduling and political resistance. It is to be completed in 2014 and is measured on the electrical power to be the second largest hydroelectric power plant in India after the Tehri Dam. Construction began in December 2007.

Building

The concrete gravity dam is above the riverbed 116 m high and over the foundation bed 130 m. The dam is 284 m long and have a building volume of 2,250,000 m³. The reservoir has a storage capacity can be used of 1.37 km ³, of which 0.44 km ³ for power generation or irrigation. At normal water level of the reservoir covers an area of 33.5 km ². The power house is located on the left bank; it receives eight 250 MW Francis turbines and generators. Annually to 7421 GWh of electricity generated.

The spillway has the shape of a ski jump.

In November 2011, the dam reached a height of 138 m, which is just below the overflow rim of the spillway at 145 m ( unclear because of opposition to the wall height, see box). On 16 December 2011, the construction was interrupted by protests.

Outflows

The water flows below the dam will vary depending on current demand and it is expected that in the winter usually low ( 6 m3 / s) outflows and evening peak high flows up to 2560 m3 / s will be for power generation.

Environmental impacts

Above and below the site, there will be environmental impacts that are typical for very large dams. This means, among other things, land loss and environmental damage.

The reservoir will flood a river section of 47 km in length and 37.5 up to 40 km ² area with subtropical Himalayan pine forests, subtropical Himalayan broadleaf forests, parts of the "Tale Valley Wildlife Sanctuary ," an elephant - habitat connectivity and some fields destroy.

Resettlements

38 families have to be relocated for the dam, according to official figures.