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|Country||China, Nepal, India|
|• location||Tibet, China|
|• elevation||3,962 m (12,999 ft)|
|Length||1,080 km (670 mi)|
|Basin size||127,950 km2 (49,400 sq mi)|
|• average||2,990 m3/s (106,000 cu ft/s)|
|• average||1,369 m3/s (48,300 cu ft/s)|
|• left||Bheri, Sarju, Kuwana, Rapti, Chhoti Gandak|
|• right||Seti, Dahawar, Sarda, Budhi Ganga|
The Ghaghara River, called Karnali River in Nepal and Mapcha Tsangpo in Tibet, is a perennial trans-boundary river that originates in the northern slopes of the Himalayas in the Tibetan Plateau, cuts through the Himalayas in Nepal and joins the Sharda River at Brahmaghat in India. Together they form the Ghaghara River, a major left bank tributary of the Ganges. With a length of 507 km (315 mi) it is the longest river in Nepal. The total length of Ghaghara River up to its confluence with the Ganges at Revelganj in Bihar is 1,080 km (670 mi). It is the largest tributary of the Ganges by volume and the second largest by length after Yamuna.
The Ghaghara river rises in the northern slopes of the Himalayas in Tibet, in the glaciers of Mapchachungo, at an elevation of about 3,962 metres (12,999 ft) above sea level. The river flows south through one of the most remote and least explored areas of Nepal as the Karnali River. The 202-kilometre (126 mi) Seti River drains the western part of the catchment and joins the Karnali River in Doti District north of Dundras hill. Another tributary, the 264-kilometre (164 mi) long Bheri, rises in the western part of Dhaulagiri Himalaya and drains the eastern part of the catchment, meeting the Karnali near Kuineghat in Surkhet.
Cutting southward across the Sivalik Hills, it splits into two branches, the Geruwa on the left and Kauriala river on the right near Chisapani to rejoin south of the Indian border and form the proper Ghaghara. Other tributaries originating in Nepal are the West Rapti, the Kali (or Mahakali) and the little Gandak. It flows southeast through Uttar Pradesh and Bihar states to join the Ganges downstream of the town of Chhapra, after a course of 1,080 kilometres (670 mi). Sarayu river is stated to be synonymous with the modern Ghaghara river or as a tributary of it.
Karnali River exposes the oldest part of the Sivalik Hills of Nepal. The remnant magnetization of siltstones and sandstones in this group suggests a depositional age of between 16 million and 5.2 million years.
The Karnali River Basin lies between the mountain ranges of Dhaulagiri in Nepal and Nanda Devi in Uttarakhand. Dhaulagiri II, elevation 7,751 metres (25,430 ft), is the highest point of the entire basin. In the north, it lies in the rain shadow of the Himalayas. The basin formed by the river has a total catchment area of 127,950 square kilometres (49,400 sq mi), of which 45 percent is in India. The population of the Basin districts in Nepal increased from 1.9 million in 1971 to 4.7 million people in 2001, almost a 250% increase over three decades. The average population density of the Basin area increased from 53 persons/km2 in 1981 to 87 persons/km2 in 2001. There is a steady growth in the economically active population in the basin districts. The average literacy rate has increased from a mere 7.5% in 1971 to 45% in 2001. The social status of the permanent households increased from 24% in 1991 to 31% in 2001. The basin has a total road length of 2,640 kilometres (1,640 mi), but the pace of road development is slow.
Chhoti Gandak is a groundwater-fed meandering river originating near Dhesopool, Maharajganj district of Uttar Pradesh. It travels a distance of about 250 kilometres (160 mi) and joins Ghaghara near Guthani, Siwan district of Bihar. The Chhoti Gandak River Basin is located between 26°00' to 27°20' N latitude and 83°30' to 84°15' E longitude. Right bank tributaries are Khekhra, Hirna, Jethan, Maun, Duhari, Kanchi and Koilar rivers; Khanua river joins from the left bank. The discharge of Chhoti Gandak is mainly controlled by rain, which is very high during the monsoon season and low during the summers. It has been observed that whenever precipitation is high in the catchment areas, there is flood in the downstream part of the Chhoti Gandak River Basin. The region exhibits upland terrace surface, river valley terrace surface, present-day river channel with narrow flood plains, natural levee, and point-bar deposits. All these geomorphic features are depositional in nature and made up of alluvium of different ages.
Administrative zones and districts
In Nepal, the Karnali Province is the largest zone with about 5,000 square miles (13,000 km2) area. Its administrative center is Jumla. The zone is divided into the five districts of Dolpa, Humla, Jumla, Kalikot and Mugu.
The Karnali Province has the lowest population density in Nepal. There are no large settlements on the banks of the river, which is only crossed near Chisapani by the Mahendra Highway. This region is now connected by karnali highway and now due to various hydro electricity projects this area is being developed. Now a 900 MW project is going to be constructed in this river
In India, the administrative districts in the Ghaghra catchment are Ambedkar Nagar, Faizabad, Ayodhya, Azamgarh, Barabanki, Basti, Ballia, Bahraich, Deoria, Gonda, Gorakhpur, Sant Kabir Nagar, Lakhimpur Kheri, Mau, Sitapur of Uttar Pradesh and Siwan district in Bihar.
Important towns in India include Akabarpur, twin towns of Ayodhya and Faizabad, Bahraich, Barabanki, Basti, Deoria, Barhalganj, Gonda, Gorakhpur, Sitapur, Siddharthnagar, Saint Kabir Nagar, Kamhariya, Rajesultanpur and Tanda in Uttar Pradesh and Chapra, Siwan, and Sonepur in Bihar.
The Ghaghra River is locally known as the legendary "Sarayu River" in the holy city of Ayodhya.
Bardia National Park is the largest and most undisturbed protected area in the Karnali River basin, covering 968 km2 (374 sq mi) on the southern slopes of the Sivalik Hills. It is bordered in the south by the Babai River, and to the west by the Girwa River, a tributary of the Karnali. At Chisapani Gorge, the swift-flowing Karnali River emerges from the Shiwalik Range onto the broad plain and flows purposefully through the semi-tropical jungle. The park is famous for two Asian elephant herds, several deer species, gaur, nilgai, Himalayan tahr, serow and goral. The Karnali supports the endangered mugger crocodile, the gharial, a few remaining South Asian river dolphins and the golden mahseer.
Other protected areas include Katarniaghat Wildlife Sanctuary.
The Karnali provides the upper range for the Gangetic river dolphin (Platanista gangetica), the largest freshwater mammals found on the Indian subcontinent. They are considered vulnerable species under CITES Appendix 1 and are classified as endangered on the IUCN Red List (IUCN, 2004). The river dolphins are legally protected animals in Nepal as endangered mammal and fall under Schedule I of the protected list of National Parks & Wildlife Conservation Act, 1973. Living at the upstream range limit, dolphins in the Karnali River are particularly vulnerable to threats from habitat degradation. Dolphins need deep pools of water. They are often found in places where human activities are most intense and they are sometimes accidentally caught by the local people who live in the lower Karnali basin. The Karnali River supports the last potentially viable population of the Ganges river dolphin in Nepal. These dolphins are at their farthest upstream range and isolated by the Girijapur Barrage (a low gated dam), located about 16 kilometres (10 mi) downstream of the Nepal–India border.
A high dam has been planned for some time just upstream of the dolphins' current (or at least recent) range in the Karnali River, Nepal. If built, this structure would almost certainly eliminate the small amount of dolphin habitat in Nepal's last river with a potentially viable dolphin population. Disturbance and environmental degradation associated with geotechnical feasibility studies and bridge and road construction for the dam already may have contributed to a decline in the number and range of dolphins or susu above the Nepal-India border. The Ghaghara is the furthest upstream in the dolphin range.
Other important protected areas and their biological and religious significance are a) Khaptad NP at 2.25 square kilometres (0.87 sq mi), 1984 - oak, fir, conifer, musk deer, leopard, black bear. Ashram of late Khaptad Baba (sage), Shiva shrine, Khaptad daha - a shallow lake; b) Dhorpatan HR at 13.25 square kilometres (5.12 sq mi), 1987- fir, hemlock, spruce, birch, junipers, grassland. Game hunting reserve; and c) Royal Suklaphanta - WR (1976) at Kanchanpur at 3.05 square kilometres (1.18 sq mi) in the Terai Sal, acacia, sisso, extensive grassland, elephant, swamp deer, tiger, hispid hare, Bengal florican.
The Karnali basin is the first to arouse keen interest in Nepal's vast hydropower development study. There are several attractive sites for the generation of cheap hydroelectric energy in this basin.
The Master Plan Study for Water Resource Development of the Upper Karnali River and Mahakali River Basins (1993) identified 32 potential hydropower projects in the Karnali Basin. Despite the high potential of hydropower development (32,000 MW) in the Basin, only 2,245 kW capacities (from eight micro hydel schemes) has been developed so far.
Considering the pace of hydropower development in Nepal (Out of 83,000 MW potential, only 705 MW hydropower has been generated throughout the country till the end of 12th national plan viz. 2009/10-2011-12) in general and in the Karnali Basin in particular, harnessing the total hydropower potential of the Basin is envisaged to take a long time. Based on recent water resources development planning and project progress, the likely large scale hydropower projects that will be operational in the Basin by 2025 are predicted to be: West Seti HEP (750 MW); Upper Karnali HEP (300 MW); Bheri-Babai Multipurpose Project (48 MW); and Lohore Khola HEP (58 MW).
West Seti HEP (750 MW)
The proposed West Seti HEP is located on the Seti River in the Far-Western Development Region of Nepal. The West Seti HEP catchment covers the upper 4,022 square kilometres (1,553 sq mi) of the Seti River Basin. The West Seti HEP is a large storage project with a rated capacity of 750 MW. The power station is located approximately 63 kilometres (39 mi) upstream of the Seti River confluence with the Karnali River, with the dam site located a further 19.2 kilometres (11.9 mi) upstream. All project sites, excluding the reservoir area and transmission line corridor, are located in either Doti and/or Dadeldhura Districts. The reservoir area is located in Doti, Dadeldhura, Baitadi and Bajhang Districts. The transmission line corridor is located in Doti, Dadeldhura, Kailali and Kanchanpur Districts. The project has been allocated for development as BOOT project under private sector.
Upper Karnali HEP (900 MW)
The proposed Upper Karnali HEP is located on the main course of the Karnali River and has a catchment area of 20,120 square kilometres (7,770 sq mi). This project is one of Nepal's most economically attractive runoff- river diversion schemes (900 MW), with daily peaking capacity and high firm energy. Project facilities will be located in three districts: Surkhet, Dailekh and Achham. Project hydrology is based on data from station 240 at Asaraghat. The river is snow fed and the mean annual estimated flow at the headworks is 500 cubic metres per second (18,000 cu ft/s). The project has been allocated to GMR of India for development on BOOT basis.
Bheri-Babai Multipurpose Project (48 MW)
The Bheri-Babai Multipurpose Project is an inter-Basin water transfer project prioritised for the development of irrigation in Bardia District . The intake of the Bheri-Babai (BR-1) diversion scheme lies on the Bheri River 45 kilometres (28 mi) upstream of the confluence with the Karnali River. The tailrace outlet is located in the Babai River 20 kilometres (12 mi) upstream of the existing Babai irrigation project diversion weir. The Bheri-Babai project aims to generate electricity and supply additional water to the Babai Irrigation Scheme in the Terai by diverting 40 cubic metres per second (1,400 cu ft/s) of water from the Bheri River into the Babai River. The project is yet to undergo a feasibility study.
Lohore Khola HEP (LR-1) – (58 MW)
The Lohore Khola HEP is a proposed reservoir storage project situated on the Lohore Khola, a tributary of the Karnali River in Dailekh District. The project is located a few kilometers downstream from the confluence with Chham River and upstream of Dungeshowr. The catchment area of the Lohore River at the reservoir site is 733 square kilometres (283 sq mi). Based on the isohyetal map of the Karnali River Basin, average annual rainfall for the basin is estimated to be 1,539 millimetres (60.6 in). As there is no stream gauge on the Lohore River, its flow was estimated using data from Station 240 (1963–2000) located on the Karnali River at Asaraghat with a catchment area of 19,260 square kilometres (7,440 sq mi). The sediment flow into the river is estimated to be 2.4 million tonnes per year. As the economic internal rate of return (EIRR) for the project is highest for the draft rate of 0.7, the flow for power generation was estimated for this draft rate. The riparian flow was assumed to be 10 percent of the monthly minimum flow; i.e., 0.53 cubic metres per second (19 cu ft/s).
Karnali (Chisapani) Multipurpose Project (10,800 MW)
The site of the Karnali Multipurpose Project, also Chisapani Dam Project, is located in the Karnali Gorge, immediately upstream of the Terai. The project has a catchment area of 43,679 square kilometres (16,865 sq mi), covering nearly 30 percent of Nepal. The long-term average river flow is 1,389 cubic metres per second (49,100 cu ft/s), with an average dry season flow (November–May) of 451 cubic metres per second (15,900 cu ft/s) and an average wet season flow (June–October) of 2,690 cubic metres per second (95,000 cu ft/s). The Karnali (Chisapani) Multipurpose Project is a potential mega multipurpose storage project on the Karnali River at Chisapani, envisaging a 270-metre (890 ft) high dam, with reservoir area of 350 square kilometres (140 sq mi), with power station operating under a design head of 185 metres (607 ft) to operate 18 units of 620 MW capacity each ( 10,800 MW installed capacity) and with a re-regulating weir downstream with power plant of 84 MW capacity operating under a head of 13.5 metres (44 ft). A large-scale irrigation development is also envisaged—2,380 square kilometres (920 sq mi) in Nepal and 32,000 square kilometres (12,000 sq mi) in India. Project planning commenced in 1960, although the feasibility study for the project was only completed in 1989. Before this project is developed a number of significant underlying issues have to be resolved. These issues include: Nepal and India reaching a bilateral agreement on the downstream benefits of regulated river flows; the resettlement of over 60,000 people; the impact on and restoration of habitat within Bardia National Park; and, above all, the financial arrangements for project funding. Accordingly, it is predicted that the chances of this project being implemented before 2025 are very slim, although increasing international pressure on reducing greenhouse gas (GHG) emissions from the energy generation sector may assist project initiation. While the likelihood of this project being developed by 2025 is low, Nepal and India could cooperate to develop this project to meet India's growing energy demand from renewable resources.
The major existing river use by volume in the Karnali Basin is irrigation. Three areas on the Nepal Terai and two areas in India are irrigated from the Karnali River. Within Nepal, two areas are irrigated in Bardiya District, 23.2 and 183.4 square kilometres (9.0 and 70.8 sq mi), and a single site is irrigated in Kailali District, 139.25 square kilometres (53.76 sq mi). The total demand for irrigation water from the Karnali River by these three areas represents a very small proportion of existing total annual river flows, amounting to a mean annual rate of 54 cubic metres per second (1,900 cu ft/s). This is equivalent to 3.9 percent of the 1,370 cubic metres per second (48,000 cu ft/s) mean annual Karnali River flow into India.
In India, water is diverted from the Karnali River at the Girija Barrage into the Sarda Sahayak Irrigation Scheme and the Saryu Nahar Irrigation Scheme, which have command areas of 20,000 square kilometres (7,700 sq mi) and 12,000 square kilometres (4,600 sq mi) respectively. The combined annual irrigation demand of these two schemes is approximately 10,000 million cubic metres (8,100,000 acre⋅ft).
The Sarda Sahayak Irrigation Project uses the combined flows from the rivers Ghaghara and Sarda in the Girija Barrage built across the Ghaghara river below a catchment area of 45,500 square kilometres (17,600 sq mi). This barrage is situated about 9 kilometres (6 mi) downstream of Khatria Ghat Rly station and 16 kilometres (10 mi) from the international border to Nepal in Bahraich district. It is linked to the Lower Sarda Barrage (built across the Sarda river, with a catchment area of 17,818 square kilometres (6,880 sq mi), about 28 kilometres (17 mi) northeast of Lakhimpur Kheri Rly station in Lakhimpur Kheri district) via a link canal from Girija Barrage to the Lower Sarda Barrage which is 28 kilometres (17 mi) long and is designed to divert a discharge of 480 cubic metres per second (17,000 cu ft/s) from Gandak to Sarda river.
The feeder channel taking off from the Lower Sarda Barrage is 258.8 kilometres (160.8 mi) long, feeds the five branches of Dariyabad, Barabani, Haideganj, RaeBareil and Purva, and is designed to carry a discharge of 765 cubic metres per second (27,000 cu ft/s). The Sarda Sahayak feeder channel meets the Haidergarh branch at 171 kilometres (106 mi) and Raibareli branch at 187 kilometres (116 mi). The entire canal system is considered the largest in Asia and designed to provide irrigation to a Culturalable Command Area (CCA) of 20,000 square kilometres (7,700 sq mi) covering 14 districts in 168 blocks with a gross command area of 40,000 square kilometres (15,000 sq mi).
On account of high silt flows during the flood season, Sarda Sahayak supplies (from Karnali) are suspended for 100 days between June and October, when the Lower Sarda Canal (feeder canal) draws water from the Sarda River, which is then flooded.
In the past the Karnali River was considered to be attractive for the development of navigation right from the Indo–Nepal border till the confluence of this river and the Ganges. The lower reach of this river—called the Ghaghra in India—was used in the past for navigation by steamers. Apart from in the foothills of the Himalayas where most of the streams were simply fast-moving water throughout the greater part of the year and not navigable when flowing rapidly, most of the rivers with steadier currents had boats on them. The Ganges, the Ghaghra, the Yamuna, the Gomti, the Sharda and the Rapti were the most important navigable rivers in the Northwestern provinces and Oudh.
Many trade items such as timber, food grains, sugar, indigo, cotton seed, poppy seed and mustard seed were transported by boats. April, May and June were the most suitable months and were a busy trading period. Different kinds of cargo boats were used on the Ganges, the smaller ones were known as palwars, while the larger ones were known as katris.
In the latter half of the 19th century when the railways came into existence, the significance of waterways as inland trade routes declined, as the railways were faster and safer. With the exception of eastern parts of Bengal where abundance of water in the natural network of channels sustained and continued to provide a suitable mode of transport of goods and people, the railways had almost entirely replaced the waterways as communication lines throughout the country by the end of the 19th century.
The possibilities for further extension of the steamer services to the north had also been explored in the past. The Central Water and Power Commission of the Government of India had carried out hydrographical survey of the Karnali River from the Bahramghat to the confluence of this river and the Ganges a distance of 446 kilometres (277 mi). This survey was done in the years 1943–53 to explore the possibility of improvement and extension of navigation on this river by powered crafts. These surveys revealed that there were only 5 shoals under 90 centimetres (35 in) at low water between Burhaj and Bahramghat a distance of about 300 kilometres (190 mi). The minimum depth was 75 centimetres (30 in). These depths were available without any river conservancy works. All other conditions of navigable channel such as the width and current of flow etc. were also found to be very favourable. The low water stage in this river is only for a short duration. There is a great urgency to carry out detailed study of the Karnali river to develop modern inland waterway by applying various channel improvement technologies.
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