GOVERNMENT OF INDIA GOVERNMENT OF NEPAL Ministry of Water Resources, Ministry of Energy River Development and Ganga Rejuvenation PANCHESHWAR DEVELOPMENT AUTHORITY (PDA) (Bi-national Entity of India and Nepal) PANCHESHWAR MULTIPURPOSE PROJECT DETAILED PROJECT REPORT VOLUME I SECTION 1: EXECUTIVE SUMMARY Consultant: [email protected], Website: http://www.wapcos.gov.in PANCHESHWAR DEVELOPMENT AUTHORITY (Bi-national Entity of India and Nepal) PANCHESHWAR MULTIPURPOSE PROJECT DETAILED PROJECT REPORT VOLUME - I SECTION 1: EXECUTIVE SUMMARY PANCHESHWAR MULTIPURPOSE PROJECT DETAILED PROJECT REPORT Section 1: Executive Summary Section 1: Executive Summary Page i PANCHESHWAR MULTIPURPOSE PROJECT DETAILED PROJECT REPORT Section 1: Executive Summary Page i PANCHESHWAR MULTIPURPOSE PROJECT DETAILED PROJECT REPORT PANCHESHWAR MULTIPURPOSE PROJECT SECTION 1: EXECUTIVE SUMMARY Table of Contents Sub-Section Sub-Headings Page Nos. 1.1 Introduction 1 1.1.1 Background 1 1.1.2 Project Location 2 1.1.3 Mahakali River Basin 3 1.1.4 Climate 4 1.1.5 Water Resources 4 1.1.6 Access 4 1.1.7 Project Features 4 1.1.8 Hydropower Potential in the Mahakali Basin 5 1.1.9 Population and Economy of the Project Area 5 1.1.10 Resettlement and Relocation Plans 5 1.1.11 Physical Environment 5 1.2 Previous Studies 6 1.2.1 WAPCOS Initial Studies -1971 6 1.2.2 Nepal DPR -1995 6 1.2.3 Joint Investigations by JPO-PI (2000-02) 6 1.2.4 Indian draft DPR -2003 6 1.3 Field Investigations and Studies of Pancheshwar 7 Multipurpose Project 1.3.1 Topography 7 1.3.2 Hydrology & Meteorology 8 1.3.3 Geology/ Geotechnics 11 1.3.3.1 Regional Geology 11 1.3.3.2 Geotechnical Investigations 12 1.3.3.3 Geology of Pancheshwar Reservoir 13 1.3.3.4 Geology of Pancheshwar Dam site 14 1.3.3.5 Geology of Pancheshwar Spillway and Plunge pool 15 1.3.3.6 Geology of UGPH on Left Bank (Nepal Side) 16 1.3.3.7 Geology of UGPH on Right Bank (India Side) 17 1.3.3.8 Geology of Diversion Works –Tunnels and Coffer dams 18 1.3.3.9 Geology of Rupaligad Dam Site and Spillway 18 1.3.3.10 Geology of UGPH on the Left Bank (Nepal Side) 20 1.3.3.11 Geology of UGPH on the Right Bank (India side) 20 1.3.3.12 Geology of Diversion works- Tunnels and Coffer Dam 21 Section 1: Executive Summary Page i PANCHESHWAR MULTIPURPOSE PROJECT DETAILED PROJECT REPORT 1.4 Sedimentation Studies 22 1.4.1 Pancheshwar Reservoir 22 1.4.2 Rupaligad Re-regulation Reservoir 23 1.5 Construction Materials 23 1.5.1 Materials Survey 23 1.5.2 Material Requirements - Pancheshwar 24 1.5.3 Laboratory Tests - Pancheshwar 24 1.5.4 Material Requirements - Rupaligad 25 1.6 Seismicity 26 1.7 Infrastructure and Communication Survey 26 1.8 Benefit Assessment & Project Optimization of 27 Pancheshwar Multipurpose Project 1.8.1 Power Market Review 27 1.8.2 Power and Energy Benefits 27 1.8.3 Irrigation Benefits 28 1.8.4 Flood Control Benefits 31 1.9 Design of Civil Structures & Preliminary Layout of 31 Pancheshwar Multipurpose Project 1.9.1 Pancheshwar Rockfill Dam 31 1.9.1.1 Concrete Dam Axis 31 1.9.1.2 Rockfill Dam Axis 32 1.9.2 Reasons for Selection of Rockfill Dam 33 1.9.2.1 Geological Consideration 33 1.9.2.2 Seismic Consideration 34 1.9.2.3 Materials Consideration 34 1.9.3 Pancheshwar - General Layout and Project Components 34 1.9.3.1 General Layout 34 1.9.3.2 Diversion and Outlet Facilities 34 1.9.3.3 Diversion Tunnels 35 1.9.3.4 Cofferdams 35 1.9.3.5 Depletion Arrangements 35 1.9.3.6 Design of Rockfill Dam 36 1.9.3.7 Foundation Treatment of Pancheshwar Dam 36 1.9.3.8 Design of Pancheshwar Spillway 36 1.9.3.9 Intake and Pressure Tunnels 37 1.9.3.10 Vertical Drop Shafts/ Penstocks 37 1.9.3.11 Pancheshwar Dam - Power Houses 37 1.9.3.12 Pancheshwar Dam - Downstream Surge Galleries 37 1.9.3.13 Draft Tube Tunnels/ Tail Race Tunnels at Pancheshwar 38 1.9.4 Rupaligad Re-Regulating Dam 38 1.9.4.1 General Layout 38 1.9.4.2 Rupaligad Concrete Gravity Dam 38 1.9.4.3 Rupaligad Dam - Spillway and Energy Dissipation 39 Arrangement 1.9.4.4 Rupaligad Dam - Diversion Arrangements 40 1.9.4.5 Rupaligad Dam – Power Intakes and Headrace Tunnels 40 1.9.4.6 Rupaligad Dam - Power Powerhouse caverns 41 Section 1: Executive Summary Page ii PANCHESHWAR MULTIPURPOSE PROJECT DETAILED PROJECT REPORT 1.9.4.7 Rupaligad Dam – Tailrace Tunnels 41 1.10 Design of Electrical and Mechanical Works 41 1.10.1 Pancheshwar Power Stations 41 1.10.2 Rupaligad Power Stations 42 1.11 Transmission System for Pancheshwar Multipurpose 42 Project 1.11.1 Evacuation System for Pancheswar Power Plants 42 1.11.2 Evacuation System for Rupaligad Power Plants 43 1.12 Environmental and Socio-Economic Impact 44 Assessment 1.12.1 Flora & Fauna 44 1.12.2 Rehabilitation & Resettlement 44 1.12.3 Environmental Management Plan including R & R Plan 45 1.13 Construction Schedule and Equipment Planning 45 1.13.1 Basic Considerations 45 1.13.2 Access Roads and Infrastructure Facilities 45 1.13.3 Equipment Planning 46 1.13.4 Construction Programme 46 1.14 Cost Estimates & Phasing of Expenditure 46 1.14.1 Abstract of Cost Estimates 46 1.14.2 Phasing of Expenditure 49 1.15 Economic and Financial Evaluation 49 1.15.1 Cost chargeable to Irrigation and Flood Control 50 Component 1.15.2 Cost chargeable to Power Component 50 1.15.3 Capitalized Cost of Hydropower Project 52 1.15.4 Levelized Tariff and Internal Rate of Return (IRR) 52 1.16 International and Interstate Aspects 52 1.16.1 Irrigation Benefits 53 1.16.2 Power Benefits 54 1.16.3 Inter-state Agreements 54 1.16.4 Interstate Aspects of the Project 55 1.16.5 International Aspects of the Project 55 1.16.6 Dispute Resolution Mechanism 56 1.16.7 Power Purchase Agreements 56 1.17 Project Management and Design Engineering 56 Consultancy 1.18 Conclusions and Recommendations 57 List of Annexure Annex-I Salient Features of Pancheshwar Dam 59 Annex-II Salient Features of Rupaligad Re-regulating Dam 65 Section 1: Executive Summary Page iii PANCHESHWAR MULTIPURPOSE PROJECT DETAILED PROJECT REPORT List of Tables Table No. Description Page No. Table 1.3-1 Average Monthly Temperature at Pancheshwar dam 8 site Table 1.3-2 Average Monthly Rainfall at Pancheshwar dam site 9 Table 1.3-3 Average Monthly Lake Evaporation at Pancheshwar 9 dam site Table 1.3-4 Average Monthly Inflows at Pancheshwar dam site 9 Table 1.3-5 Floods for different Return period (m3/s) 10 Table 1.3-6 Rock Sequence from South (Tanakpur) to North 10 (Tawaghat) Table 1.3-7 Changes in Reservoir Capacity with sedimentation 11 Table 1.5-1 Construction Materials Balance – Pancheshwar 24 Table 1.8-1 Annual Energy Generation 28 Table 1.8-2 Total Water Requirement of India and Nepal 68 including River Eco-System (in m3/s) Table 1.14-1 Abstract of cost of Pancheshwar Dam 47 Table-1.14-2 Abstract of Cost of Rupaligad Dam 48 Table 1.14-3 Yearly requirement of funds to both countries (in 49 INR Million) Table 1.15-1 Assessment of Project Benefits 50 Table 1.15-2 Apportionment of project cost in power and irrigation 51 sector Table 1.15-3 Phasing of Expenditure on power component of 52 PMP (in INR million) Table 1.15-4 Levelized Tariff and IRR for different loan repayment 52 periods Table 1.16-1 Various parameters of Project 54 Section 1: Executive Summary Page iv PANCHESHWAR MULTIPURPOSE PROJECT DETAILED PROJECT REPORT List of Drawings Sr. No. Drawing No. Title of Drawings A. General 1. DRG.NO.WAP/PANCH/ES-01 Index Map of Pancheshwar Multipurpose Project 2. DRG.NO.WAP/PANCH/ES-02 Regional Geological Map of Project Area B. Pancheshwar Dam 3. DRG.NO.WAP/PANCH/ES-03 Geological Map of Pancheshwar Dam Site 4. DRG.NO.WAP/PANCH/ES-04 Layout Plan Showing Drill Holes & Drifts 5. DRG.NO.WAP/PANCH/ES-05 Geological Section along Rockfill Dam 6. DRG.NO.WAP/PANCH/ES-06 General Layout Plan of Pancheshwar Dam 7. DRG.NO.WAP/PANCH/ES-07 L-Section along Pressure Tunnel 8. DRG.NO.WAP/PANCH/ES-08 Maximum Section of Rockfill Dam 9. DRG.NO.WAP/PANCH/ES-09 Pancheshwar Spillway – Maximum Over Flow Section 10. DRG.NO.WAP/PANCH/ES-10 Pancheshwar Spillway- Maximum Non-Over Flow Section 11. DRG.NO.WAP/PANCH/ES-11 Power House Cross-Section 12. DRG.NO.WAP/PANCH/ES-12 Layout Of Machine Hall, Bus Duct Galleries & Transformer Hall 13. DRG.NO.WAP/PANCH/ES-13 Schematic Diagram of 11kv & 415v Ac Switchgears 14. DRG.NO.WAP/PANCH/ES-14 Location Plan of Quarry, Borrow Area and Muck Disposal Areas C. Rupaligad Re-regulating Dam 15. DRG.NO.WAP/PANCH/ES-15 Geological Map with Location of Drill Holes and Drifts at Rupaligad 16. DRG.NO.WAP/PANCH/ES-16 Geological Section along the Rupaligad dam 17. DRG.NO.WAP/PANCH/ES-17 Rupaligad Dam – General Layout Plan 18. DRG.NO.WAP/PANCH/ES-18 L-Section Through Water Conductor System 19. DRG.NO.WAP/PANCH/ES-19 Rupaligad Dam - Upstream Elevation 20.