Teesta - Ministry of Power

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13 Preliminary Feasibility Report Teesta (I) HE Project (4 x 80 MW) other. Rangit also joins the Teesta just near the broader between Sikkim and West Bengal at Melli. Besides the river, there are number of lakes and hot springs which add to the beauty of the region. The important hot springs are Phut sachu, Raeong sachu, Yumthang and Momay. 2.1.2 Topography The total geographical area of Sikkim State is about 7300 sq. km. The maximum horizontal length from north to south is about 112 Km. whereas the maximum width from east to west is 90 Km. The Tibetan Plateau on the north, Nathula and other passes on the north east, Bhutan on the south east, Darjeeling district of West Bengal on the south and Singalila range of Nepal from the boundaries of this picturesque Himalayan State. It is a hill state having no plain area. The altitude above mean sea level varies from 213m in the south to over 8500m in the northwest. The Khangchedzonga, the third highest peak in the world at an elevation of about 8550m adorns the state with its beautiful range covered with shining snow. Gangtok, the capital is about 1677m above mean sea level. The northern part of the state is cut into deep escarpments. The northern part is not populated except in Lachung and Lachen valleys. Southern Sikkim is, however, more open and fairly well cultivated. 2.1.3 Rivers The river Teesta is one of the main Himalayan Rivers, which originates in the glaciers of Sikkim at an elevation of over 8500m above mean sea level. River rises in mountainous terrain and is formed mainly by the union of two hill streams Lachen Chu and Lachung Chu at Chungthang in North Sikkim. After the confluence of Lachen Chu and Lachung chu at Chungthang, the river gradually increases in width and takes a wide flowing down to Singhik, dropping in elevation from 1550m to 750m. At Singhik, the river receives one of the its major tributaries, the Talung chug on its right. Talung Chu originates from the Talung glaciers, which are the part of the Khangchendzonga range. From Singhik, the rivers flow towards Dikchu in a very deep
14 Preliminary Feasibility Report Teesta (I) HE Project (4 x 80 MW) valley and drops from 750mto 550m. From Dikchu the river flows in a big curve again down to the Singtam with a drop of about 200m. The Rongnichu, which drains the Changu lake area joins Teesta from left at Singtam and the river receives Rangpo Chu at Rangpo. After Rangpo, Teesta start widening rapidly and is joined by the great Rangit at Melli bazar on Sikkim – West Bengal border. 2.1.4 Communication By Air Bagdogra is the nearest airport of Sikkim. There are regular scheduled flights operated by the Indian airlines and other private airlines between Calcutta, the capital of West Bengal and Bagdogra and also between New Delhi and Bagdogra. Jeep & taxis are available outsides Bagdogra airport for Gangtok. Gangtok is 124 kms from Bagdogra and the journey takes about 4 hours by jeep and 5 hours by bus. By Rail /Road The two closest railway stations to Gangtok are Siliguri junction, (Meter Gauge) which is 114km away and New Jailpaiguri (Broad Gauge), which is 125km away. A number of trains are available for Calcutta, Delhi, Guwhati and other important cities of India. Besides jeep taxis, Sikkim National Transport and other private buses ply regularly between Sikkim and Siliguri. 2.1.5 Project 2.1.5.1 Background In order to exploit vast hydro potential in the country and to achieve the ideal hydro thermal mix of 40:60, the Honourable Prime Minister of India had launched a hydroelectric initiative on 24th May 2003 to develop 50,000MW hydro power potential in the country. Accordingly, based on the results of the preliminary ranking studies of Central Electricity Authority, 162 hydroelectric power schemes with estimated installed capacity of 50,560MW were selected in 16 states for preparation of Pre
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
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Page 26 and 27: Table 2.1 POWER SUPPLY POSITION OF
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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
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TEESTA-I H.E PROJECT AVERAGE 10-DAI
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62 Preliminary Feasibility Report T
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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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