Why An Expert Review?
As desired by Government of Assam, NHPC constituted an expert group consisting of experts from IIT, Guwahati, Gauhati University and Dibrugarh University to study the downstream impact of Lower Subansiri HEP (2000 MW). The expert group submitted its final report on March 3, 2011.
Also, on the concerns expressed by Government of Assam regarding structural safety of the dam, Planning Commission has appointed a two member Technical Experts Committee to study the technical reports of the expert group.
No Threat of Earthquake
The past earthquakes including occurrence of 1950 earthquake were considered during the site specific earthquake design parameters study by Department of Earthquake Engineering, IIT Roorkee. Central Water Commission informed that the seismic data, past history of earthquakes in the country is maintained by Indian Meteorological Department which includes the earthquake of 1950 referred herein. All such information has been taken into account for carrying out the seismic studies during submission of proposal of Lower Subansiri Hydro-electric Project.
About Local People
Concerns of local people on the safety of the dam were referred to the two-member Technical Experts Committee. In addition, on the concerns of downstream impact, a joint steering committee was constituted by NHPC on April 19, 2011 to suggest feasible and practicable remedial measures in the downstream areas with reference to expert group’s recommendations on downstream impact of Subansiri Lower Dam (Part-II) along with issues related to flood, bank erosion and sediment control. Also, as recommended by Inter-Ministerial Group headed by secretary (water resources), a cumulative environment impact assessment study of Lohit sub-basin was recently completed by WAPCOS and studies for Subansiri and Siang sub-basins were commissioned by Central Water Commission.