West Rapti River

Last updated

West Rapti
Kuwano
Pulchowk, Bhalubang, Deukhuri, Dang.jpg
West Rapti river at Bhalubang
Location
Country Nepal, India
Physical characteristics
Source 
  location Rapti Zone, Nepal south of border of Rukum District with Rolpa District
  coordinates 28°28′33″N82°52′44″E / 28.4757°N 82.8788°E / 28.4757; 82.8788
  elevation3,500 m (11,500 ft)
Mouth  
  location
Ghaghara River
  coordinates
26°17′20″N83°40′08″E / 26.289°N 83.669°E / 26.289; 83.669
  elevation
60 m (200 ft)
Basin size23,900 km2 (9,200 sq mi)
Discharge 
  average136 m3/s (4,800 cu ft/s)
Basin features
River system Ganges
Tributaries 
  leftLungri Khola, Jhimruk Khola, Ami River, Rohini River
  rightArun Khola,

The West Rapti, also known as the Kuwano, is a river which drains Rapti Zone in Mid-Western Region, Nepal, then Awadh and Bhojpur-Purvanchal regions of Uttar Pradesh state, and finally India before joining the Ghaghara. It is a major left bank tributary of the Ganges, and is also known as the Karnali in Nepal.

Contents

The West Rapti is notable for janajati ethnic groups – Kham Magar among its highland sources and then Tharu in Inner Terai Deukhuri Valley, for its irrigation and hydroelectric potential, and for recurrent floods that led to its nickname "Gorakhpur's Sorrow".

Max depth 8.50

Min depth 10.7

History

As ancient Airavati river

Aciravati, Achirvati or Airavati is the ancient name for a river has been identified with the modern Rapti, flowing through what is now Nepal and the northern portion of Uttar Pradesh. [1] [2] The Chinese pilgrim Xuanzang knew it as A-chi-lo. Jain texts mention it as Eravai. [2]

The ancient city of Sravasti, once capital of Kosala Kingdom, stood on the western bank of the Achirvati. The river was a tributary of the Sarayu. It was one of the five great rivers that constituted the Ganges group of rivers and one of the sacred rivers of the Buddhist midland. [2] [3]

Geography

The Rapti rises south of a prominent E-W ridgeline midway between the western Dhaulagiri Himalaya and the Mahabharat Range. A 3,500 metres (11,500 ft) summit on this ridgeline marks a triple divide. North of the triple divide the Karnali and Gandaki basins are adjacent; south of it the Rapti and similar but smaller Babai River (Nepali : बबई नदी; Babaī Nadī) separate the two larger basins. After crossing into India, the Babai and Rapti separately join the Karnali's continuation called Ghaghara. The Ghaghara ultimately joins the Ganges.

Hydrology

The Rapti's headwaters descend south from rugged highlands populated by Kham Magar. The western tributary Mādī Kholā (Nepali : माडी खोला) rises in northwestern Rolpa and is joined by Lungrī Kholā (Nepali : लुङग्री खोला) draining northeastern Rolpa. The Mardi then crosses into Pyuthan. It is joined by east-flowing Arun Kholā (Nepali : अरुण खोला) at Devithān (Nepali : देवीथान) where it enters a gorge through the Mahabharat Range.

Jhimruk Kholā (Nepali : झिमरुक खोला) -- east of the Mardi—mainly drains Pyuthan. Below the upper highlands, an alluvial valley opens where Brahman and Chhetri rice farmers irrigate paddy fields. At Cherneta, Pyuthan the Jhimruk approaches within 1.5 km of the Mardi and a 12 megawatt hydroelectric plant exploits the Jhimruk being 200 meters higher.

Below Cherneta the Jhimruk loops east, becoming the border between Pyuthan and Arghakhanchi District. Its valley narrows and steepens as it enters the Mahabharat Range. Partway through it joins the Mardi and the combined flow is then named the Rapti. The main river emerges from its gorge into the lower Siwalik Hills and Dang District. At Bhalubang Bazaar Nepal's east-west Mahendra Highway bridges the river.

Below Bhalubang, Inner Terai Deukhuri Valley opens between the Dang and Dudhwa Ranges , both sub ranges of the Siwaliks. Valley, following the WNW trend of the Siwalik hills for 100 km. Although the land is fertile, before DDT came into use in the 1950s Deukhuri was so malarial that only the Tharu people who had genetic resistance could be confident of surviving the warmer months.

The river crosses from Dang into Banke District. Approaching Nepalganj—largest town in Nepal's western Terai—the Dudhwa Hills fall away and the river turns SE, crossing into Uttar Pradesh, India and flowing through districts Shravasti, Siddharth Nagar, Basti, Sant Kabir Nagar, Maharajganj District and Gorakhpur, passing Gorakhpur city at about 135 air miles (215 km) from Nepal.[ citation needed ]

Just west of the city it is joined by the smaller Rohini rising further east in Nepal's Nawalparasi and Rupandehi Districts, draining 794 km2 in Nepal then 1892 km2 following through Maharajganj District in India. 60 km beyond Gorakhpur the Rapti joins the Ghaghara (Karnali) at Rajpur. About 120 km further on at Chhapra, the Ghaghara reaches the Ganges. [4] [5] [6] [7]

Resource utilisation

The Rapti's flow has great seasonal variation because the river lacks sources in high elevation glaciers and snowfields to buffer pre-monsoon drought. Average monthly flows at Jalkundi (27°58'N, 82°14'E) in Deukhuri Valley vary from 17.6 m3/s in pre-monsoon April to 451 m3/s at the peak of the monsoon in August. Maximum recorded flood was 7,390 m3/s on 10 September 1981. 100-year flood flows are predicted at 10,100 m3/s. Every year, floods threaten over 700,000 acres (280,000 ha) in Uttar Pradesh.[ citation needed ]

Flood control projects under study include a dam at Jalkundi that would inundate 71,000 acres (29,000 ha) of farmland in Deukhuri Valley. An alternative dam site is upstream at Naumure on the Pyuthan-Dang district border (27°53'N, 82°48'E). This would be an earthen dam 169 m high with 351 million cubic meters live storage capacity, storing excess monsoon flows for irrigation use during the following dry season and generating up to 207 megawatts. Impoundment would mainly be in gorges through the Mahabharat Range, inundating less farmland than the Jalkundi alternative. Plans are also underway for three irrigation sub-projects – Kapilvastu District 30,500 hectares (75,000 acres) involving interbasin water transfer to the southeast, Deukhuri Valley 9,500 hectares (23,000 acres), and Banke District 40,000 hectares (99,000 acres). [8]

Related Research Articles

<span class="mw-page-title-main">Rapti Zone</span> Former administrative area in Nepal

Rapti Zone was one of the fourteen zones, located in the Mid-Western Development Region of Nepal. It was named after the West Rapti River which drains Rolpa, Pyuthan and part of Dang districts. The remainder of Dang and part of Salyan district are drained by the Babai. The remainder of Salyan and all of Rukum districts are drained by the Bheri.

<span class="mw-page-title-main">Arghakhanchi District</span> District in Lumbini Province, Nepal

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<span class="mw-page-title-main">Ghaghara</span> Asian river and tributary of the Ganges

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<span class="mw-page-title-main">Banke District</span> District in Lumbini Province, Nepal

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<span class="mw-page-title-main">Dang District, Nepal</span> District in Lumbini Province, FDR Nepal

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<span class="mw-page-title-main">Ghorahi</span> Sub-Metropolitan City in Lumbini, Nepal

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Deukhuri, also known as Deukhuri Valley, is a proposed permanent capital of Lumbini Province in Nepal which was decided on 20th of Aswin 2077 BS. The temporary capital of Lumbini is in Butwal.

Jhimruk Khola Hydropower Station is a run-of-river hydro-electric plant located in Pyuthan District of Nepal. The flow from Jhimruk River, a tributary of West Rapti River, is used to generate 12 MW electricity and annual energy of 72 GWh. The flow is transferred to Madi River at the tailrace. The powerhouse is semi-underground type located on the bank of the Madi River. The plant is owned and developed by Butwal Power Company Limited, an IPP of Nepal in technical help from UMN. The plant started generating electricity since 2052-01-25 BS. The generation licence will expire in 2101-12-30 BS, after which the plant will be handed over to the government. The power station is connected to 132 kV national grid through 41 km long transmission line at Lamahi substation. The electricity is sold to Nepal Electricity Authority.

References

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  5. "Basti". Basti district administration. Retrieved 30 May 2010.
  6. "Sant Kabir Nagar district". Sant Kabir Nagar district administration. Retrieved 30 May 2010.
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  8. Dwarika N. Dhungel, Santa B. Pun (18 January 2009). The Nepal-India Water Relationship: Challenges. Springer. ISBN   9781402084034 . Retrieved 28 May 2010.{{cite book}}: |work= ignored (help)