Effect of peaking power generation by Siang Lower HEP, Demwe Lower HEP and Dibang Multipurpose HEP on Dibru-Saikhowa national park

The Dibru-Saikhowa National Park is situated on the Left Bank of the river Brahmaputra in the extreme east of Assam and falls between the following geographical coordinates: Latitudes: 27° 30’ – 27° 45’N, Longitudes: 95°10’ – 95° 45’E. Brahmaputra River is mainly formed by confluence of three rivers namely Siang River, Dibang River and Lohit River. Series of hydropower projects are proposed on these three tributaries of Brahmaputra River upstream of confluence point out of which the three large projects located closest to it are, Demwe Lower HEP (1750 MW) on Lohit River, Dibang Multipurpose HEP (3000 MW) on Dibang River and Lower Siang HEP (2700 MW) on Siang River. The purpose of this study is to examine the entire situation and based on available data for these 3 projects simulate the hydraulic conditions to quantify the flows and stage during the lean months. The effect of the winter peaking is proposed to be studied on the Brahamputra river near the Dibru-Saikhowa National park which is a place of importance from the point of view of natural habitat of many species. Dibru-Saikhowa is actually a riverine island having rich bio-diversity.