Lingza - Ministry of Power

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11 Preliminary Feasibility Report Lingza HE Project (3 x 40 MW) 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 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 chu on its right. Tolung 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 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
12 Preliminary Feasibility Report Lingza HE Project (3 x 40 MW) 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 The 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 Feasibility Reports. The work of preparation of PFR’s was entrusted by Ministry of Power under overall
Page 3 and 4: CHAPTER I TABLE OF CONTENTS DESCRIP
Page 5 and 6: TITLE ANNEXURES Preliminary Feasibi
Page 7 and 8: 1.0 INTRODUCTION CHAPTER-I EXECUTIV
Page 9 and 10: Diversion Tunnel Gate 2nos., 3 M X
Page 11 and 12: Shape Circular, Steel Lined Length
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Page 15 and 16: Civil works : 527.68 Electro Mechan
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Page 23 and 24: 2.2.3 Load Demand & Power Position
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Page 27 and 28: 3.2 SOCIO-ECONOMIC AND OTHER ASPECT
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Page 53 and 54: (iii) Based on observed G&D data at
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6.3 FURTHER STUDIES 6.3.1 Topograph
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6.4.11 Instrument And Remote Contro
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7.1 GENERAL CHAPTER-VII POWER POTEN
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Net operating head =MDDL+2/3 (FRL-M
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Month JUNE JULY AUGUST SEPTEMBER OC
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TABLE 7.3 70 Preliminary Feasibilit
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S. No. 1 2 3 4 5 6 7 8 9 10 11 TABL
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Period Yearly inflow (M Cum) Annual
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INCREMENTAL MW?MU/?MW 2.50 2.00 1.5
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TABLE 7.7(B) 78 Preliminary Feasibi
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TABLE7.7 (D) ENERGY GENERATION IN Y
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TABLE 7.7 (F) ENERGY GENERATION IN
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TABLE7.7 (H) ENERGY GENERATION IN Y
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TABLE7.7 (J) ENERGY GENERATION IN Y
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TABLE 7.7 (L) ENERGY GENERATION IN
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TABLE 7.7 (N) ENERGY GENERATION IN
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TABLE 7.7 (P) ENERGY GENERATION IN
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TABLE 7.7 (R) ENERGY GENERATION IN
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TABLE 7.7 (T) ENERGY GENERATION IN
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Preliminary Feasibility Report Ling
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Educational Facilities 106 Prelimin
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9.5.3 Impacts on Air Environment 11
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CHAPTER - X INFRASTRUCTURE 10.1 EXI
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INFRASTRUCTURE Acquisition of priva
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CHAPTER -XII COST ESTIMATES 130 Pre
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ABSTRACT OF COST OF WORKS 134 Preli
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3.0 Pre-Construction Stage Investig
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S. N. DIVERSION TUNNELS 140 Prelimi
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DAM 142 Preliminary Feasibility Rep
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J-POWER PLANT APURTENANCE (CIVIL WO
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S. N. DESILTING CHAMBER (INCLUDING
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S. N. HEAD RACE AND TAIL RACE TUNNE
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S. N. PRESSURE SHAFTS AND PENSTOCKS
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S. N. SWITCH YARD 152 Preliminary F
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Sl No K-BUILDINGS Description Plint
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DISTRIBUTION OF COST UNDER HEAD Q -
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S. No. V - RECEIPT & RECOVERIES Ite
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14 15 S.No. Marine frieght and insu
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UNIT COST OF ENERGY AT BUS BAR AT C
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DIVERSION BED LEVEL : 1055 m. PANAN
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27° 45' 40' 35' 27° 30' 88° 15'
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LINGZA H.E. SCHEME - SIKKIM PLATE 4
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2000 2000 2200 2400 2600 2800 RINGP
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2000 PROPOSED ROAD 1800 1600 1400 1
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L7 L6 ? L5 L4 125000 L3 ? L2 ? 3000
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HRT3.3 M. Ø Ø3300 Ø10000 TYP. SE
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The area around the proposed projec
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Neogi et al (1986) have clubbed tog
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compositional banding in metasedime
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evident. The latter graben is consi
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REFERENCE Chakraborti, B., and Bane
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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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TITLE ANNEXURES 6.2 Preliminary Fea
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studies methodologies has been furn
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REPLY ON COMMENTS OF CEA (HP & I )
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REPLY ON COMMENTS OF SP&PA DIVISION
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REPLY ON COMMENTS OF CMDD DIRECTORA
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Lingza - Ministry of Power

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