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Dihing River
Burhi Dihing River
Dihing river at Namsai, Arunachal Pradesh
Dihing River is located in Assam
Dihing River
Location in Assam, India
Dihing River is located in India
Dihing River
Dihing River (India)
Location
CountryIndia (Arunachal Pradesh, Assam)
Physical characteristics
SourcePatkai Hills
 • elevation2,375 m (7,792 ft)[2]
MouthBrahmaputra River
 • coordinates
27°14′0″N 94°42′0″E / 27.23333°N 94.70000°E / 27.23333; 94.70000[1]
Length380 km (240 mi)[2]
Basin size6,000 km2 (2,300 sq mi)[2]

The Dihing[3] or Burhi Dihing (Dihong = wide river) is a large tributary, about 380 kilometres (240 mi) long,[2] of the Brahmaputra River in Upper Assam in northeastern India. The river originates at 2,375 metres (7,792 ft) above sea level in the Eastern Himalayas (the Patkai Hills)[2] in Arunachal Pradesh and flows through Tinsukia and Dibrugarh Districts in Assam to its confluence with the Brahmaputra at Dihingmukh. Its watershed covers about 6,000 square kilometres (2,300 sq mi).[2] The Dihing has created a number of oxbow lakes in the area.

Namdapha River is a tributary of the Dihing on its northern bank. Disang River is a tributary of the Dihing in its southern bank. The Jeypore-Dihing Rainforest, Namdapha National Park, numerous petroleum fields, wet-paddy fields, bamboo orchards and tea gardens provide a unique landscape along its course. Ledo, Margherita, Digboi, Duliajan and Naharkatia (Nahorkotiya) are the small towns in its valley. Dihing is one of the largest contributors to the Brahmaputra River. The plains of the Dihing Valley has a rich variety of flora and fauna. The Betel nuts are produced most in the areas of the Dihing Plains.[3]

History

[edit]

According to historical as well as geographical records, the Dihing once flowed through entire Upper Assam and met the Brahmaputra at Mahuramukh in Bokakhat. At that time the rivers Disang, Dikhou, Disai, Dhansiri were all tributaries to the Dihing. The river later dried out during the 17th century (as mentioned in Buranjis) and changed course to join the Brahmaputra at Dihingmukh.[3]

Even before that, the river met the Brahmaputra near the confluence of Subansiri River. At that time the Dikhou River had an independent route and flowed as Kolong and joined the Brahmaputra at Kajalimukh in Nagaon district.[4]

Bridges and crossings

[edit]
  1. Rail bridge of chain age 41.480 kilometers situated at Kutuha Kachari Village of length 288.20 meter and width 6.30 meters.
  2. RCC bridge of chain age 41.610 kilometers situated at Kutuha Kachari Village of length 236.30 meter and width 8.18 meters.
  3. Rail bridge of chain age 54.586 kilometers situated at Kowar Kharoni Village of length 504.20 meter and width 8.50 meters.
  4. Steel bridge of chain age 102.625 kilometers situated at Cheerika Beel Village of length 616.6 meter and width 3.13 meters.
  5. RCC bridge of chain age 108.730 kilometers situated at Kowar Kharoni Village of length 273.93 meter and width 8.25 meters.
  6. Rail bridge of chain age 109.136 kilometers situated at Kowar Kharoni Village of length 339.30 meter and width 5.89 meters.

[3]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Dihing River

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from Grokipedia
The Dihing River, also known as the Burhi Dihing or Noa-Dihing, is a major south-bank tributary of the in northeastern , renowned for its ecological and economic significance in the region. Originating in the Hills near the -Myanmar border in Arunachal Pradesh's at an elevation of approximately 2,375 meters, the river flows southwest for about 380 kilometers through rugged terrain and fertile plains. The river's course traverses the districts of Tirap and Changlang in before entering , where it meanders through and districts, forming oxbow lakes and wetlands along the way. It ultimately joins the Brahmaputra at Dihingmukh in , contributing to the larger river system's load and seasonal flooding dynamics. With a spanning roughly 6,000 square kilometers, the Dihing supports paddy cultivation, expansive plantations, and diverse aquatic habitats, though its braided channel morphology makes it highly dynamic and prone to . Key tributaries include the Noa-Dihing (its upper reach), Disang, Dirak, and Tengapani, which enhance its flow and , sustaining over 50 species across 18 families in its lower stretches. Economically, the river is vital near the oil fields and refinery in , but it has faced environmental threats such as crude oil spills, industrial , and severe flooding and in 2025, underscoring the need for conservation efforts in this ecologically sensitive zone.

Geography

Origin and Course

The Dihing River originates near the India-Myanmar border in the Hills of Arunachal Pradesh's Tirap and Changlang districts at an elevation of 2,375 meters above sea level. From its source, the river initially flows northward through hilly terrain before flowing generally westward into the plains of , where it traverses the and districts. This course reflects the river's descent from the Eastern Himalayan foothills into the broader , shaping a diverse riparian environment along its path. Spanning a total length of approximately 380 kilometers, the Dihing passes through several key towns in its upper and middle reaches, including Ledo, Margherita, Digboi, Duliajan, and Naharkatia. These settlements are situated amid a varied landscape featuring dense tropical rainforests, such as the Jeypore-Dihing Rainforest, expansive tea plantations, and significant petroleum fields, particularly around Digboi, which marks one of India's earliest oil exploration sites. The river's meandering path through these areas supports both natural ecosystems and human activities integral to the region's economy. In its lower reaches, the Dihing converges with the at Dihingmukh, located at coordinates 27°14′0″N 94°42′0″E. This zone is characterized by dynamic fluvial processes, including the formation of lakes from abandoned meanders, which contribute to the features of the surrounding .

River Basin

The Dihing River basin covers a total area of approximately 6,000 km², spanning parts of and in northeastern . This catchment lies within the broader system, contributing to the region's extensive drainage network. The basin is physiographically divided into upper hilly reaches in the and lower alluvial plains in Upper . The upper section, comprising about 60% of the basin area above 150 m above mean , features rugged terrain underlain by Tertiary sedimentary rocks and older metamorphics. In contrast, the lower plains, below 150 m , consist of recent alluvial deposits formed by accumulation from upstream . The basin's configuration is shaped by surrounding physiographic features, including the Patkai Hills to the south, where the river originates, the to the north influencing the northern tributaries like the Noa-Dihing, and the expansive plains to the east. These elements create a transitional , with the hilly uplands channeling water southward into the low-lying alluvial zones. In the lower plains, the river's meandering behavior has led to the formation of wetlands and lakes through channel shifting and neck cutoffs. These features enhance the basin's hydrological diversity and support localized aquatic ecosystems.

Hydrology

Tributaries

The Dihing River, also known as Burhi Dihing in its lower reaches, is augmented by several major tributaries originating from the hilly terrains of and , which contribute to its flow and basin expansion. The Noa-Dihing forms its primary upper reach, originating near the Indo-Myanmar border in the Mishmi Hills-Patkai transition area and traversing the biodiverse before continuing as the main channel in eastern . The Burhi Dihing, referred to as the Old Dihing, is the main channel of the river, spanning approximately 380 km from its source in the Hills and joining the Brahmaputra at Dihingmukh near in ; it is characterized by significant channel migration and braiding patterns. Additional notable tributaries include the Namdapha River, flowing from the northern slopes and merging with the Noa-Dihing (upper Dihing) within the Namdapha region; the Dirak River from the left bank and Tengapani River from the right bank, both originating in Arunachal hills and joining in the upper reaches. Smaller streams, such as those around Dehingmukh, also feed into the lower course. These confluences progressively widen the Dihing's channel in its downstream sections, supporting a broader and enhanced .

Flow Characteristics

The Dihing River exhibits a pronounced seasonal flow regime typical of the Brahmaputra basin, with high discharges during the monsoon season from June to October, accounting for approximately 70-80% of the annual precipitation in its . This period sees elevated water levels due to intense rainfall ranging from 2,100 to 3,880 mm annually, leading to peak flows that can exceed 2,000 m³/s in the lower reaches. In contrast, winter months experience low flows, with discharges dropping significantly as rainfall diminishes to less than 10% of the annual total. The average annual discharge at the confluence with the Brahmaputra is estimated at around 1,500 m³/s, based on gauging data from the lower Burhi Dihing segment. Peak monsoon discharges have been recorded up to 2,260 m³/s, reflecting the river's high variability and flood-prone nature. Recent flood frequency analyses indicate that discharges of 3,331 m³/s and 4,985 m³/s correspond to 50-year and 1,000-year return periods, respectively, using Gumbel Extreme Value and Log-Pearson Type III distributions on historical data from 1972–1997. Sediment dynamics play a critical role in the river's flow characteristics, with the Burhi Dihing contributing an average annual suspended load of 3.62 million tons, primarily transported during high-flow events. This load, which peaks in July when 33% of the annual total is moved, significantly adds to the Brahmaputra's overall of about 402 million tons per year. The heavy influx causes channel , with rises of up to 16 cm observed in related reaches, promoting meandering and braiding patterns downstream.

Ecology and Biodiversity

Flora and Fauna

The upper reaches of the Dihing River, particularly in the Jeypore-Dehing and Namdapha areas, support a rich rainforest flora dominated by dipterocarp species such as Dipterocarpus retusus (hollong), which forms the canopy of the lowland tropical wet evergreen forests. These forests also harbor diverse understory elements, including over 100 orchid species across 45 genera, such as epiphytic and terrestrial varieties adapted to the humid, shaded conditions, and extensive bamboo groves comprising genera like Dendrocalamus and Bambusa that thrive along riverine edges. In the valley orchards, Areca catechu (betel nut) is a prominent cultivated plant, with the Dihing Plains serving as a major production hub due to the fertile alluvial soils and moderate climate. The river's fauna is equally diverse, with aquatic habitats hosting approximately 50 fish species across 18 families, including cyprinids like the golden mahseer (Tor putitora) and various catfishes from the Bagridae and Siluridae families, which inhabit the clear, oxygenated waters and gravelly beds suitable for a potential fishery. In the surrounding Namdapha National Park, terrestrial mammals such as Bengal tigers (Panthera tigris tigris), Asian elephants (Elephas maximus), and the hoolock gibbon (Hoolock hoolock), India's only ape, rely on the riverine corridors for foraging and movement through the dense forests. Riparian and aquatic species along the Dihing include waterfowl like egrets and that forage in shallow floodplains, freshwater turtles such as the (Pangshura sylhetensis), and amphibians including endemic frogs adapted to the seasonal inundations that reshape habitats and promote breeding. These elements highlight the river's role in sustaining a dynamic ecosystem resilient to periodic flooding.

Conservation Efforts

The Dihing River faces moderate primarily from effluents originating in estates and oil fields along its course. Studies indicate that surface water quality parameters, including ranging from 7.04 to 8.14, remain within permissible limits for aquatic life and domestic use, with dissolved oxygen levels between 8.2 and 11.1 mg/L supporting populations. However, elevated during monsoons, driven by sediment runoff, reduce water transparency to as low as 11.5 cm and pose challenges for ecological health. Key threats to the river include deforestation in the upper catchment, oil spills, channel migration leading to bank erosion, and frequent flooding exacerbated by its interactions with the Brahmaputra River. Deforestation around the Namsai area has intensified soil erosion, particularly during rainy seasons, contributing to siltation in the river basin. A notable incident in February 2020 involved a crude oil spillage in the Burhi Dihing stretch near Dibrugarh, igniting a fire that threatened aquatic ecosystems and oxbow lakes. Despite the suspension of official coal mining in the Dehing Patkai landscape in July 2020 and its upgrade to national park status in June 2021, illegal coal mining activities have continued, fragmenting habitats, polluting water sources, and accelerating biodiversity loss as of 2025, with satellite imagery revealing denudation in January 2025 and a Gauhati High Court suo motu case in February 2025. Conservation initiatives encompass protected areas and government-led monitoring programs. , established in 1983 in , safeguards the upper catchment of the Noa-Dihing River, preserving in this Eastern Himalayan hotspot through habitat protection and anti-encroachment measures. , notified in June 2021, protects the rainforest landscapes along the lower Dihing in . In , the state's River Rejuvenation Committee has implemented an action plan for the Burhi Dihing under the National River Conservation Plan, focusing on along banks to mitigate , installation of a 4.5 MLD plant at , and monthly monitoring at key sites like and . These efforts also integrate wetland management to address siltation and flood risks in associated oxbow lakes.

Human Aspects

Economic Significance

The Dihing River plays a pivotal role in the economy of 's Upper Assam region, particularly through its support for plantations in the Dihing Valley. This valley, encompassing parts of and districts, is one of Assam's premier tea-growing areas, with sprawling estates contributing substantially to the state's output of approximately 650 million kilograms in 2024. The river's seasonal floods deposit nutrient-rich across the valley's alluvial plains, naturally fertilizing the soils and enabling high-yield tea cultivation without extensive artificial . The river also bolsters the petroleum sector by traversing near the historic oil fields in , India's oldest continuously producing oil field since its commercial inception in 1889. This proximity facilitates logistical support for extraction and refining operations at the Assam Oil Division, a cornerstone of India's industry that has historically driven regional through employment and revenue generation. In agriculture and fisheries, the Dihing sustains vital livelihoods by irrigating paddy fields and betel nut groves along its banks, while its waters harbor a rich ichthyofauna of approximately 50 fish species, including commercially important ones like Channa punctata and Puntius sophore. These resources supplement food security and income for local communities through capture fisheries. Additionally, the Dihing supports , with stretches like the Buri Dihing navigable for about 35 kilometers during monsoons, enabling the transport of goods such as and agricultural produce to markets. Its regime further aids in by replenishing and distributing for crop enhancement.

Infrastructure

The infrastructure associated with the Dihing River, also known as the Burhi Dihing, primarily consists of flood control embankments and related protective measures to address recurrent and erosion in its basin. These structures are crucial for safeguarding agricultural lands and settlements in upper , particularly in districts like and . Embankments along the river have been subject to breaches during high , such as the incident in July 2024 when the embankment in the Hatibondha area of Tengakhat, , failed, leading to extensive inundation of nearby areas. Anti-erosion and embankment upgrading projects were initiated in early 2022 by the Water Resources Department under the Integrated Basin Program. As of November 2025, the project has achieved 90% physical progress on no-regret river works for the Burhi Dihing basin, with full completion targeted by January 2027. These efforts target approximately 40 km of embankments, incorporating riverbank protection to benefit around 100,000 people in the Burhi Dihing and Beki basins by improving flood resilience. In September 2025, the Buridihing River Basin Panel held its second meeting to address and challenges, reflecting ongoing conservation initiatives. systems for the Burhi Dihing basin are being upgraded, with the system expected to be operational by January 2027 to enhance early warning capabilities. Other supporting structures include canals drawn from the river's tributaries to serve agricultural needs in the valley, though specific details on their extent remain limited in . Minor dams and weirs have also been constructed along tributaries for to tea estates, aiding during dry periods in the region's .

History

Geological Evolution

The Dihing River basin formed within the Eastern Himalayan foreland as part of the broader tectonic response to the ongoing convergence between the Indian Plate and the Eurasian and Burmese Plates, which initiated the Himalayan around 50 million years ago and continues to drive uplift and in the region. This convergence has shaped the foreland basin system, where flexural loading from the rising creates accommodation space for sediments derived from orogenic erosion, with the eastern segment influenced by oblique along the Indo-Burman boundary. The river's upper reaches emerge from this dynamic setting, channeling through tectonically active zones that control its overall morphology. The Dihing River flows through two primary tectonic domains: the Mishmi Massif to the north, representing the eastern syntaxis of the Himalayan fold-thrust belt, and the Naga-Patkai Range to the south, an extension of the Indo-Myanmar mobile belt formed by Indo-Burman convergence. These domains impose steep gradients in the upper basin, with elevations exceeding 4,000 meters in the Mishmi Massif and up to 3,000 meters in the Naga-Patkai Range, resulting in high-energy fluvial incision and knickpoints at major structures such as the Tidding Suture Zone, Mishmi Thrust, and Naga Thrust. The interplay of these northern Himalayan and southern Indo-Burman influences creates a transitional tectonic framework that dictates the river's incision patterns and basin geometry. Morphotectonic reveals significant basin , with an overall asymmetry factor of 60.33, attributed to thrust faulting and differential uplift along faults like the Naga Thrust and a transverse fault (F1) in the alluvial plains. Upstream segments tilt southward (asymmetry factor 57.21) due to Himalayan thrusting, while downstream areas tilt northward (asymmetry factor 3.13) from Naga-Patkai compression, leading to an elongated, irregular basin shape with higher hypsometric integrals (0.46) in the northern sub-basins compared to 0.36 in the south. These parameters, derived from digital elevation models and drainage network , indicate active tectonic control over long-term basin . The history of the Dihing River reflects erosion from mixed sources in its basin, including southern Indo-Burman terrains and some northern Himalayan inputs via tectonic sutures, contributing to the Brahmaputra system, which receives about 70% of its influx from northern Himalayan sources overall. This erosional flux, amplified by steep gradients and monsoon-driven weathering in the Mishmi Massif and surrounding areas, supports progradation of the Brahmaputra delta, where over the , the system has deposited billions of tons of to counter tectonic rates of 1-2 mm/year in the eastern Bengal Basin. The Dihing's contribution underscores the river's role in the regional budget, linking orogenic to deltaic .

Avulsion Events

The Dihing River, also known as Burhi Dihing, has experienced significant channel shifts throughout its history, as documented in Ahom chronicles and contemporary scientific analyses. These avulsion events reflect the river's dynamic nature in the alluvial plains of , influenced by seasonal flooding and sediment dynamics. In the , the river gained prominence during the reign of Ahom king (r. 1497–1539), who established his capital at Bakata on its banks and earned the title Dihingia Raja due to this association. The Satsari Asom Buranji records conflicts over fishing rights in the Dihing, which contributed to the Ahom annexation of Chutiya territories up to , underscoring the river's strategic role. During Suhungmung's rule, widespread embankments or bunds were constructed along the river for flood control, marking an early human response to its shifting tendencies; subsequent Ahom rulers expanded these initiatives to mitigate inundation in the floodplain. Historical accounts in the Ahom Buranjis indicate major course alterations in the , including the abandonment of the original channel leading to Mahuramukh near Bokakhat and the establishment of a new path joining the Brahmaputra at Dihingmukh, accompanied by drying of the former route. Earlier prehistoric configurations suggest the Dihing once converged with the Brahmaputra near the Subansiri , while the Dikhou functioned as an independent akin to the Kolong River. Over centuries, such shifts have left archaeological remnants, such as the Moiramora site on a dry riverbed, evidencing repeated avulsions. In modern times, and GIS technologies have enabled detailed monitoring of channel migration in the Burhi Dihing, particularly from the late onward. A study spanning 1934 to 2004, using topographic maps and , quantified totaling 31.169 km² and deposition of 30.101 km², with the highest erosion rates in the 2001–2004 interval at 21,055.47 m²/km annually, highlighting accelerated adjustments in the alluvial reaches. More recent analysis from 1989 to 2018, employing Landsat data processed in , revealed net deposition of 3,935.964 hectares outweighing erosion of 1,552.961 hectares, alongside an increase in braiding index from 1.76 to 1.96 and channel area reduction from 102.78 km² to 78.949 km², indicating ongoing lateral migration and sandbar proliferation. These observations emphasize the river's persistent dynamism, with progressions exceeding regressions as observed up to 2018.

References

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