Jaiprakash underway using Robbins 8.3 m hardrock TBM to bore headrace in quartzite and six Atlas Copco 352 and 353 drillrigs mining the chambers. Norconsult is involved as designer. October 1999.Hindustan Construction Company has been awarded Stage III of the Chamera hydroelectric project by the National Hydroelectric Power Corporation (NHPC). Stage III of the scheme is located in the Chamba district of Himachal Pradesh on the banks of the river Ravi. The project comprises of a 68 m-high dam, an underground power house (3 units of 77 MW each), a 340 m-long 8.2 m-diameter horseshoe-shaped diversion tunnel, a 15.93 km-long 6.5 m-diameter concrete-lined headrace tunnel, a 18 m-diameter 110 m-high surge shaft, and two underground parallel desilting chambers (each 300 m x 13 m x 22 m in size). The project is valued at Rs5.05 billion and has a completion period of 60 months. Visit www.nhpcindia.com/english/press/uri2chamera3.htm and www.hccindia.com 46/05.
