Client: Budhi Gandaki Hydroelectric Project Development Committee. General Presentation

Transcription

1 Client: Budhi Gandaki Hydroelectric Project Development Committee General Presentation

2 1. Background and objectives 2. Project location 3. Project information/features 4. Project performances 5. Environmental and social impacts 6. Downstream impact 7. Project cost 8. Project returns and benefits 9. Project implementation

3 Background and objectives... Site identified by SMEC 1978 as RoR of capacity MW NEA carried out prefeasibility study in different stages Feasibility, Detailed Design, Environmental and Social studies carried out by Tractebel Eng, France. Extensive Field Investigations, Laboratory studies, EIA surveys (996m of investigation tunnels, 1800m of core drilling, 115 km2 of LiDAR Topography, Hydraulic model testing, geological Surveys, Fauna Flora & Social Census surveys, Public Hearings Preparation of Final Reports etc.) Up to date progress 1. Final Detail Engineering Design/Drawings Ready 2. Tender Document - Ready 3. EIA Report - in the process of approval

4 2. Project Location 4 Budhi Gandaki River, 2km from confluence with Trishuli River at Benighat 80 km from Kathmandu Gorkha and Dhading Districts Western and Central Development Region of Nepal April 25th 2015 Earthquake

5 El. 8156m CHINA Catchment area 5005 Km 2 El. 500m Note (1) : based on latest measurements and inflow series INDIA Mean annual Discharge at dam site 280 m3/sec (1) NEPAL

6 Main characteristics of the reservoir Reservoir area-volume curves and storage Arughat

7 SELECTED LAYOUT

8

9 PROJECT INFORMATION 1. Reservoir Surface area at FRL : 63 Sq. Km Existing river bed level: 320m amsl Full Reservoir Level (FRL): 540m amsl Gross storage capacity : 4.46 BMC Live storage capacity: 2.22 BMC Minimum operation level: 496m amsl Minimum Operating level ultimate: 467m amsl

10 PROJECT INFORMATION 2. Hydrology & Sediment Catchment area: 5005 SqKm Average flow: 222 Cumec GLOF: 3000 Cumec LDOF: 5200 Cumec PMF: 9800 Cumec Sediment inflow: 9.8 MCM/yr Storage loss after 50 yrs: 7% and after 100 yrs: 13%

11 PROJECT INFORMATION 3. Dam and appurtenant structures a. Dam Dam type: Double curvature arch dam Dam height : 263 m b. Diversion system Diversion tunnel : 2 Diameter 12 m Design flood: 3070 Cumec

12 PROJECT INFORMATION c. Intake and water ways Number of intake:6 Intake invert level: 450m amsl Number of HRT: 6 and diameter: 5.3m Number of penstock pipe: 6 and diameter: 5.3m d. Spill way Spill way type: Orifice, radial gated Number: 6

13 PROJECT INFORMATION 4. Generation, Transmission and out put Turbine type: Francis, vertical axis Number of unit: 6 Net head: 200m Rated discharge: 6*112Cumec: 672 Cumec Installed capacity: 1200MW Mean annual Energy: 4250GWhr Winter dry season energy: 1623 GWhr Wet season energy:2627 GWhr Transmission line: 2, S/S: 2 Hetauda and Naubise

14 PROJECT PERFORMANCES Month Capacity Output Energy Output Peak Capacity Duration Daily Monthly MW Hours GWh GWH Dry season Mid-Dec to mid-jan Mid-Jan to mid-feb Mid-Feb to mid-march Mid-March to mid-apr Mid-Apr to mid-may Sub total Dry Season 1623 Wet season Mid-May to mid-june Mid-June to mid-july Mid-July to mid-aug Mid-Aug to mid-sep Mid-Sep to mid-oct Mid-Oct to mid-nov Mid-Nov to mid-dec Sub total Wet Season 2627 Mean Annual Energy 4 250

15 ENVIRONMENTAL AND SOCIAL IMPACTS Displaced Infrastructure Nos Public Educational Institutions 23 Other service infrastructures (health posts, police post, post office, community halls etc) 64 Temples and Shrines 74 Motorable Road 132 km Motorable Bridges 6 Suspension Bridges 30 Cremation Sites 44 Dhawa above Full supply Level Darbun below Full Supply Level Land use Type Area (ha) Bush 637 Forest 1765 Grass 222 Barren Land 3 Cultivation / settlement 3183 Dense Settlement 0.8 Nursery 1.3 Orchard 19 Cliff 4 Sand 562 Water Body 390 Total 6788 Affected VDCs in Gorkha and Dhading districts

16 DOWNSTREAM IMPACTS Modified Naranyani Discharges after implementation of BG HPP Project + 44 to +65% from Jan. to Apr. Hydrogram at Devghat + 40 to +56% from Jan. to Apr. Hydrogram at Gandak Barrage

17 Investment cost: MUSD ENVIROMENTAL & SOCIAL MEASURES 612 MUSD 2% LOT 1 : PREPARATORY WORKS 61 MUSD 24% 46 % LOT 2 : DAM MUSD LOT 3 : POWER COMPONENT 729 MUSD 28 %

18 ECONOMIC PERFORMANCES

19 IMPLEMENTATION STRATEGY LOT 3 : POWER COMPONENT & TRANSMISSION LINES LOT 1 : PREPARATORY WORKS & ROADS LOT 2 : DAM & APPURTENANT WORKS

20 Implementation Strategy Lot No. 1 (as per Quantities) -related to the construction of all Preparatory Works (including the access roads, one bridge on the Budhi Gandaki River and the camps for the Employer). Lot No. 2 (EPC Contract) Dam and Appurtenant Structures - Design and construction of the Main Dam, spillway, mid-level and low-level outlets, tailwater dam, powerhouse excavations down to el. 345masl, diversion works (cofferdam and diversion tunnels) + supply and erection of related hydromechanical equipment. Lot No. 3 (EPC Contract) Powerhouse and Waterways - Design and construction of power intakes, gate shafts, power tunnels, powerhouse exaction below el. 345masl, the powerhouse complex civil works and tailrace channel, supply, installation and commissioning of hydro turbines, hydro generators, main step-up transformers, auxiliary electrical and control equipment, balance of plant mechanical systems, related hydro-mechanical equipment, Transmission Lines.

21