Cumulative Impact and Carrying Capacity Study Of
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Cumulative Impact and Carrying Capacity Study of Subansiri Sub Basin including Downstream Impacts Submitted by: Submitted to: IRG Systems South Asia Pvt. Ltd. Central Water Commission, LGF, AADI Building Ministry of Water Resources 2, Balbir Saxena Marg, Hauz Khas, Sewa Bhawan, R.K. Puram, New Delhi –110 016, INDIA New Delhi – 110 066 Tel: +91-11-4597 4597 India Fax: +91-11- 2656 2050 In association with EQMS India Pvt. Ltd. 304 & 305, 3rd Floor, Plot No. 16, Rishabh Towers, Community Centre, Karkardooma, Delhi – 110 092 Final Report Phones: +91-11-30003200 Fax: (91 11) 22374775 Volume - I August, 2015 2 Table of Content Chapter 1: Introduction ..........................................................................................................................17 1.1 Background............................................................................................................................................. 17 1.2 Study Area.................................................................................................................................... 17 1.2.1 Hydro Electric Projects Envisaged in Subansiri Basin......................................................... 18 1.3 Scope of Work (SoW)............................................................................................................................. 18 1.4 Outcome of the Study............................................................................................................................. 18 1.5 Outline of the Report............................................................................................................................... 19 Chapter 2: Basin Characteristics .............................................................................................................20 2.1 Introduction............................................................................................................................................. 20 2.2 Physiography & Drainage Network of River Subansiri............................................................................ 20 2.3 Relief....................................................................................................................................................... 27 2.4 Slope....................................................................................................................................................... 28 2.5 Geology .................................................................................................................................................. 28 2.6 Soils of Subansiri Basin.......................................................................................................................... 33 2.7 Socio-cultural and religious values ......................................................................................................... 41 Chapter 3: Hydropower Development in Subansiri Basin.............................................................................44 3.1 Overall Hydropotential & Identified Project ............................................................................................. 44 3.2 Current Status......................................................................................................................................... 44 3.3 Projects Description................................................................................................................................ 48 Chapter 4: Hydrometeorology .................................................................................................................70 4.1 General Climatic Conditions in Subansiri Basin...................................................................................... 70 4.2 Rainfall.................................................................................................................................................... 70 4.3 Temperature and Humidity ..................................................................................................................... 74 4.4 Water Availability.................................................................................................................................... 76 Chapter 5: Approach and Methodology.....................................................................................................81 5.1 Approach & Methodology ....................................................................................................................... 81 5.2 Assessment of Aquatic and Terrestrial biodiversity ................................................................................ 85 5.3 Identification of Impacts.......................................................................................................................... 91 5.4 Assessment of Environmental Flows...................................................................................................... 92 5.5 Mid course corrections (as per comments of TAC in the meeting on May 01, 2012 and field visit in April, 2012) & Actions taken............................................................................................................................. 92 Chapter 6: Terrestrial Ecology.................................................................................................................94 6.1 Introduction............................................................................................................................................. 94 6.2 Land Use................................................................................................................................................ 94 6.3 Forest Cover........................................................................................................................................... 97 6.4 Forest Types in Arunachal Pradesh...................................................................................................... 100 3 6.5 Forest types in Subansiri Basin ............................................................................................................ 103 6.6 Floristic Diversity of Arunachal Pradesh ............................................................................................... 108 6.7 Economically Important Plants.............................................................................................................. 120 6.8 Epiphytes.............................................................................................................................................. 126 6.9 Floristic diversity in Subansiri Basin, Arunachal Pradesh ..................................................................... 126 6.10 Community Structure............................................................................................................................ 154 6.11 Natural Resource Use in the Basin....................................................................................................... 185 6.12 Endemic Flora of Subansiri Basin....................................................................................................... 191 6.13 Threatened plants reported from Subansiri Basin of Arunachal Pradesh............................................. 195 6.14 Faunal Diversity of Arunachal Pradesh................................................................................................. 202 6.15 Faunal diversity in Subansiri basin, Arunachal Pradesh....................................................................... 208 6.16 Threatened species in Subansiri Basin, Arunachal Pradesh ................................................................ 211 6.17 Species listed in various schedules of Indian Wildlife Protection Act, 1972 (as amended till date) ...... 211 6.18 Endemic species................................................................................................................................... 212 6.19 Primary survey results .......................................................................................................................... 212 6.20 Protected Areas in Arunachal Pradesh................................................................................................. 219 6.21 Protected areas in Subansiri Basin....................................................................................................... 221 6.22 Important Bird Areas in Arunachal Pradesh.......................................................................................... 223 Chapter 7: Aquatic Ecology ..................................................................................................................225 7.1 Water Quality........................................................................................................................................ 225 7.1.1 Physico-Chemical Water Quality ................................................................................... 225 7.1.1.1 Subansiri River ...................................................................................................... 226 7.1.1.2 Kurung River.......................................................................................................... 228 7.1.1.3 Page River............................................................................................................. 232 7.1.1.4 Kale River .............................................................................................................. 234 7.1.2 Conclusion ....................................................................................................................