Teesta - Ministry of Power

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35 Preliminary Feasibility Report Teesta (I) HE Project (4 x 80 MW) Two major tectonic features occur in the area namely MBT (Main Boundary Thrust) and MCT (Main Central Thrust) besides other minor features. Many past occurrences of earthquakes have been associated with these major lineaments. Site-specific earthquake studies for the scheme are required to be conducted. A Technical Report from IMD on seismic history and seismicity of the Teesta basin of sikkim covering proposed sites is placed as annexure-4.2. 4.5 GEO-PHYSICAL SURVEY The dam-I is covered with thick snow while the dam-II was not approachable due to which Geo-Physical survey was not feasible. However the powerhouse site is having rock exposures, hence the Geophysical survey is not required. 4.6 CONSTRUCTION MATERIAL SURVEY The riverbed deposit may not be sufficient for the requirement of construction material. The area is bounded by rocky ridges. Therefore additional quarries for construction material can be developed. 4.7 FURTHER STUDIES • The foundation for structures are required to be investigated by subsurface explorations to assess overburden thickness and its amenability for construction of various structures. • Construction material survey needs to be conducted to assess its quantity and suitability. • The possibility of the use of excavated muck may also be explored after testing.
36 Preliminary Feasibility Report Teesta (I) HE Project (4 x 80 MW) Photo-1A: A View of Teesta Valley in Vicinity of Shacham Photo-1B: A View of Teesta Valley Indicating Valley Slope
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 8 and 9: 2 Preliminary Feasibility Report Te
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
Page 18 and 19: Preliminary Feasibility Report Tees
Page 20 and 21: 13 Preliminary Feasibility Report T
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
Page 56 and 57: 9. Sirwani (Power House Site-Teesta
Page 64 and 65: 28°0' 27°45' 88°15' PAKI CHU 88
Page 66 and 67: Year TEESTA BASIN PROJECTS 56 Preli
Page 70 and 71: TEESTA-I H.E PROJECT AVERAGE 10-DAI
Page 74 and 75: Discharge (cumec) 55 50 45 40 35 30
Page 76 and 77: Elevation(m) Area(Ha) Capacity(Ha.m
Page 78 and 79: CHPAPER-VI CONCEPTUAL PLANNING AND
Page 82 and 83: 6.2.3 Reservoirs 71 Preliminary Fea
Page 86 and 87: 6.2.7.2 Tail Race Tunnel 75 Prelimi
Page 90 and 91: 6.4.1.8 Instrument And Remote Contr
Page 92 and 93: 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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88 Preliminary Feasibility Report T
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90 Preliminary Feasibility Report T
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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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Teesta - Ministry of Power

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