Teesta - Ministry of Power

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33 Preliminary Feasibility Report Teesta (I) HE Project (4 x 80 MW) channel. The river valley is occupied by overburden deposit, which may be of the order of 10-15 m towards the left bank. The bed load of the river comprises of boulders, pebbles and cobbles in a sandy/silty matrix. Towards the left bank rock exposures are seen binding the nala slopes. The slopes are moderate to steep. A thin veneer of slope wash material hosts sporadic vegetation. Rock type in the area comprises of gneisses, which are moderately strong to strong. The diversion area needs to be investigated with a back up of subsurface explorations in order to assess the extent of overburden cover and nature of bedrock. The diversion structure on Zemu Chhu, could not be approached however, the area appears to be bound by steep ridges. Rock types comprising of gneisses are expected. Before firming up the location of the proposed dam, the area needs to be investigated. 4.3.2 Water Conductor System The water conductor system shall be located in the right hill. The right hill from Shacham to Zemu is highly rugged and dissected by several drainages however, no major drainage has been observed in this area. In general the E-W trending ridges are seen. At places, along the road slope wash deposits were observed. Rock types of the area exposed as steep rocky escarpments. The rock types comprise of gneisses, which are expected to offer fair to good tunnelling media. In this area quartzites and garnet schists have been reported and these may be encountered during tunneling. The water conductor system that will carry the water of Zemu Chhu to the proposed power house shall be located within the left bank of Zemu Chhu in steep rocky escarpments which trend almost N-S and culminate into a NW-SE trending ridge towards Zemu. Central Crystallines of Higher Himalaya comprising of gneisses are expected during tunnelling. This water conductor system is expected to provide fair to good tunnelling media. From the topographic sheet 78 A/9, it is observed that this water conductor system will cross below Dozam Chhu nala, accordingly the tunnel
34 Preliminary Feasibility Report Teesta (I) HE Project (4 x 80 MW) alignment below this nala shall be suitably laced to have a sufficient cover. Sufficient super-incumbent cover is otherwise available above both the tunnels. 4.3.3. Power House The proposed powerhouse shall be located in vicinity of Zemu village. At this location a NW-SE trending ridge occupies the area between river Teesta and Zemu Chhu. This ridge is seen to continuously rise and is steeply laid. A thin veneer of slope wash material generally occupies the ridge. However, towards the confluence the area is under a thick cover of slope wash deposit (Photo 2). At present an underground powerhouse has been contemplated. The area is occupied by rock type of high grade gneisses. These are expected to provide fair to good rock media. The orientation of the cavern shall be suitably aligned with respect to the principal discontinuity. The powerhouse area is required to be investigated for assessing rockmass condition and the same need to be taken up during the further course of investigation. The tail waters will be discharged into the river Teesta upstream of the confluence of Zemu Chhu and river Teesta. 4.4 SEISMICITY The site lies within Zone – IV of seismic zoning map of India IS 1893 (Part – I) 2002. IMD data of the region covering longitude 86-90 0 and 25-29 0 has been appended in Annexure 4.2, which gives a list of earthquake events that have occurred within the region. The probable intensity of earthquake within seismic zone-IV corresponds to intensity VIII on Modified Mercali Scale. Notable earthquakes that have occurred close to this area are Cachar 1869 (M 7.5), Great Assam Earthquake 1897 (M 8.7), Dhubri 1930 (M 7.1), Bihar-Nepal Earthquake 1934 (M 8.3), Assam Earthquake 1950 (M 8.5) and Nepal-India border earthquake 1988 (M 6.4). The maximum intensity experienced in Sikkim region during Great Assam Earthquake, 1897 was VIII (MMI) and during Bihar-Nepal border earthquake, 1934 was VII (MMI).
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
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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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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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