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2 Preliminary Feasibility Report Teesta (I) HE Project (4 x 80 MW) II) to provide a total live storage of 2.82 mcum. with FRL at 3265m and MDDL at 3258m; • two intakes and two desilting chambers system of size 200m(L)x8m(W)x12m(H) for each water conductor to remove silt particles of size 0.2mm and above; • two 4m diameter concrete lined 3.5km and 4.25km long head race tunnels terminating in a surge shaft; • a 75m high, 15m dia surge shaft; • 825m long, 2.5m dia two pressure shaft; • an underground power house having an installation of 4 Vertical Pelton turbine generating units of 80 MW each operating under a net head of 576.85m; and • a 1000m long, 5.0m diameter tailrace tunnel to carry the power house release back to the river; The power generated from the project would be evacuated through one number 400KV double circuit lines to be connected at the pooling station which is assumed to come up near Teesta-I HE Project to feed power to the power grid. The salient features of the projects are as under: LOCATION SALIENT FEATURES State Sikkim District North Sikkim Location of Dam -I + 500 m D/S of confluence of Lohnak chu with Zemu chu on Zemu Chu Latitude & Longitude of Dam-I 27º46’46’’N & 88º30’00E Location of Dam-II + 700 m D/S of confluence of Chento chu with Teesta river on Teesta river Latitude & Longitude of Dam-II 27º48’19’’ & 88º33’25’’
3 Preliminary Feasibility Report Teesta (I) HE Project (4 x 80 MW) Location of Power House Just U/S of confluence of Zemu chu with Teesta Latitude & Longitude of Power House 27º45’50’’ & 88º32’30’’ Nearest Rail head New Jalpaiguri Nearest Airport Bagdogra HYDROLOGY Catchment area Dam -I 881 km 2 Catchment area Dam-II 600 km 2 Design Flood for Dam -I 1600 m 3 /sec Design Flood for Dam-II 1300 m 3 /sec DIVERSION TUNNELS Diameter & Shape (for both DT’s) 6 m, Horse-shoe shaped Length of DT for Dam-I 600 m Length of DT for Dam-II 300m Diversion Discharge(for both DT’s) ± 400 m 3 /sec Diversion Tunnel Gate 1 No. Vertical lift gate Size of Gate 6m × 8m COFFER DAMS (for both dams) Type Rockfill with central clay core. Maximum height of upstream coffer dam ± 15.0 m Maximum height of downstream coffer dam CONCRETE DAM-I ± 8.0 m Type Concrete Gravity
Page 1: 50 000 MW HYDROELECTRIC INITIATIVE
Page 4 and 5: TITLE LIST OF PLATES Preliminary Fe
Page 6 and 7: Preliminary Feasibility Report Tees
Page 10 and 11: Dam Top EL.3270 m River bed level a
Page 12 and 13: SILT FLUSHING TUNNELS (for both the
Page 14 and 15: 1.2 STUDIES/INVESTIGATIONS UNDERTAK
Page 16 and 17: 1.3.5 Environmental Aspects 10 Prel
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Page 26 and 27: Table 2.1 POWER SUPPLY POSITION OF
Page 28 and 29: CHAPTER -III PROJECT AREA 20 Prelim
Page 32 and 33: 3.2.6 Natural Resources 24 Prelimin
Page 34 and 35: Rangit Basin 26 Preliminary Feasibi
Page 36 and 37: 10. Rammam Stage-I 70 MW Rammam 11.
Page 38 and 39: 4.1 INTRODUCTION CHAPTER-IV TOPOGRA
Page 40 and 41: Group Lithology 31 Preliminary Feas
Page 46 and 47: Photo-2: A view of Power House Area
Page 48 and 49: 5.1 GENERAL CHAPTER -V HYDROLOGY 38
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48 Preliminary Feasibility Report T
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28°0' 27°45' 88°15' PAKI CHU 88
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Year TEESTA BASIN PROJECTS 56 Preli
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TEESTA-I H.E PROJECT AVERAGE 10-DAI
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Discharge (cumec) 55 50 45 40 35 30
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Elevation(m) Area(Ha) Capacity(Ha.m
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CHPAPER-VI CONCEPTUAL PLANNING AND
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6.2.3 Reservoirs 71 Preliminary Fea
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6.2.7.2 Tail Race Tunnel 75 Prelimi
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6.4.1.8 Instrument And Remote Contr
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6.4.2.5 Silt Flushing Tunnel Gates
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Preliminary Feasibility Report Tees
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90% Dependable Year: 84 Preliminary
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Table-7.1 DISCHARGE DATA 86 Prelimi
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PERIOD Table-7.5 92 Preliminary Fea
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INCREMENTAL (DMU/DMW) 2.60 2.40 2.2
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Table-7.7 (B) 96 Preliminary Feasib
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Table-7.7 (D) 98 Preliminary Feasib
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Table-7.7 (F) 100 Preliminary Feasi
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Table-7.7 (H) 102 Preliminary Feasi
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Table-7.7 (J) 104 Preliminary Feasi
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Table-7.7 (L) 106 Preliminary Feasi
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Table-7.7 (N) 108 Preliminary Feasi
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Table-7.7 (P) 110 Preliminary Feasi
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Table-7.7 (R) 112 Preliminary Feasi
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Table-7.7 (T) 114 Preliminary Feasi
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9.2 PHYSICAL ENVIRONMENT 9.2.1 Clim
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120 Preliminary Feasibility Report
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9.6.5 Impacts on Socio-Economic Env
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10.1.3 Power Availability 140 Preli
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11.2.10 Tail Race Tunnel: 149 Preli
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Sl. No. Name of Work Unit Quantiy D
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CHAPTER -XII COST ESTIMATES 152 Pre
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2.13 Consultant’s fees including
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S. N. ABSTRACT OF COST OF C - WORKS
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S. No. COFFER DAMS (FOR BOTH THE DA
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S. No. SPILLWAYS (FOR DAM-I & DAM-I
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S. No. INTAKE STRUCTURES (FOR BOTH
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S. No. ADITS 170 Preliminary Feasib
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S. No. SURGE SHAFT 172 Preliminary
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S. No. POWER HOUSE COMPLEX 174 Prel
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S. No. HYDRO MECHANICAL EQUIPMENT 1
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S. No O-MISCELLANEOUS 182 Prelimina
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S. No. V - RECEIPT & RECOVERIES 190
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13 14 15 16 17 18 Custom Duty @22%
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Year Estimated Cost at June 2003 P.
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CALCULATION OF ENERGY RATE WITH PRE
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TALEM H.E PROJECT R.B.L- EL. 3630 F
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TALEM HYDRO ELECTRIC PROJECT (3 X 2
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27° 47' LOHNAK CHU 3400 U/S COFFER
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H.R.T. 4.0 MØ H.S. SHAPE (FROM DAM
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L10 ? L9 L8 L7 PARAPET L6 ? L5 ? 17
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HRT4000 Ø FROM DAM-I 32Ø 5000 LON
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The rock types encountered in the a
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SEISMOTECTONICS AND SEISMICITY Seis
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interbanded and are expected to pro
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founded on sandy soil is higher tha
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X Some well built wooden structures
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1940 8 2 3 3 59 . 0 28 . 00 90 . 50
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1988 5 10 7 16 16 . 1 25 . 32 90 .
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1997 1 25 20 8 28 . 7 30 . 00 88 .
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2000 10 3 17 8 22 . 4 26 . 88 89 .
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REPLY OF COMMENTS OF CEA (HP & I )
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REPLY ON COMMENTS OF SP&PA DIVISION
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Sikkim is on the higher side as the
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of the project on the fast track ba
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Consistency of data Water availabil
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YEAR/ MONTH I 1976 II III I 1977 II
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