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Koshi Barrage

The Koshi Barrage is a sluice structure spanning 1,149 meters across the Saptakoshi River at Bhimnagar in southeastern Nepal, near the border with India, equipped with 56 gates to regulate flow for flood mitigation and irrigation downstream.^[1] Constructed between 1959 and 1962 under the bilateral Koshi Agreement, it addresses the river's high sediment load and migratory channel behavior, which historically caused devastating floods in Bihar.^[1]^[2] The barrage can discharge up to 950,000 cubic feet per second, supporting agricultural water supply while doubling as a roadway bridge for vehicular and pedestrian traffic linking Nepal's Saptari and Sunsari districts.^[1] Despite these functions, the system has faced repeated embankment breaches—nine since 1963, including a catastrophic 2008 failure upstream that inundated over 100,000 hectares and displaced thousands—due to silt accumulation raising bed levels and inadequate maintenance amid the river's avulsive tendencies.^[3]^[4] Now exceeding its 50-year design life, the aging infrastructure heightens vulnerability to intensifying monsoon flows, prompting calls for upstream reservoir dams to manage sediment and enhance control.^[5]

History

Planning and Koshi Agreement

Planning for the Koshi Barrage emerged in the early 1950s amid recurrent devastating floods from the Koshi River, which caused widespread destruction in Bihar, India, prompting Indian authorities to pursue structural interventions on the river's upper reaches in Nepal.^[6] In December 1953, the Indian Lok Sabha approved the Kosi Barrage and Embankment Project as a key component of flood mitigation efforts.^[7] Negotiations between India and Nepal, marked by prolonged discussions over sovereignty, land rights, and benefits sharing, culminated in the Koshi Agreement signed on 25 April 1954 in Kathmandu.^[8] The agreement authorized India to conduct surveys and investigations for the project (Article 2) and outlined the construction of a barrage approximately 8 miles upstream of Hanuman Nagar town, along with associated headworks, for flood control, irrigation, power generation, and erosion prevention (Article 4).^[8] Under the agreement, India assumed responsibility for funding, executing construction, acquiring necessary land with compensation, and regulating river flows, while Nepal provided the required land free of cost, facilitated access, and retained sovereignty over the project areas leased to India (Articles 3, 5, 8).^[8] Nepal was entitled to irrigation benefits from eastern canals, up to 50% of generated power within a specified radius, and royalties from extracted materials, reflecting an intent to balance bilateral interests in water resource management (Articles 4, 14).^[8] The agreement entered into force immediately upon signature and laid the groundwork for project implementation, including joint land measurement for compensation categorized by type (cultivated, forest, village, or waste lands) to ensure equitable resettlement (Article 8).^[8] A 1966 revision adjusted the barrage location to 3 miles upstream of Hanuman Nagar, introduced requirements for Nepalese consultation on major works, and formalized a 199-year lease for project areas at nominal rent, but these changes primarily refined operational terms post-initial planning without altering the core construction mandate.^[9]

Construction Phase

The construction of the Koshi Barrage was initiated under the framework of the 1954 Koshi Agreement between India and Nepal, with India responsible for financing and executing the project at its own cost.^[10] The foundation stone was laid on April 30, 1959, by Nepal's King Mahendra and India's Prime Minister Jawaharlal Nehru, marking the formal start of building activities.^[11] Actual construction work spanned from 1959 to 1962, during which the barrage was erected at Bhimnagar, approximately 8 km inside Nepalese territory and 5 km upstream of Hanuman Nagar.^[1] ^[10] The project faced engineering difficulties due to the Koshi River's high sediment load and tendency to shift channels, which contributed to siltation issues and escalated expenses beyond initial projections.^[10] Originally estimated at Rs. 45 crores, the final cost reached Rs. 54.5 crores, reflecting adaptations to these geological challenges.^[10] Indian teams, informed by prior surveys such as the 1946 A.N. Khosla committee assessment, managed the works, incorporating a 1,149 m long structure with 56 gates designed for flood discharge up to 950,000 cusecs.^[10] ^[1] Upon completion in 1962, the barrage and associated Eastern Main Canal became operational, enabling initial irrigation in Nepal and Bihar while prioritizing flood mitigation.^[10] The agreement's revision in 1966 further assigned India ongoing maintenance responsibilities, underscoring the bilateral commitment to the structure's longevity despite construction hurdles.^[1]

Design and Technical Specifications

Structural Components

The Koshi Barrage comprises a 1,149-meter-long concrete structure spanning the Koshi River, designed as a gated weir to regulate flow and mitigate flooding.^[12]^[1] This main body includes 56 sluice gates, spaced to allow controlled discharge, with the structure also incorporating a 10-meter-wide roadway for cross-border vehicular traffic between Nepal and India.^[1]^[13] The gates, each integrated into individual bays separated by piers, enable the release of up to 950,000 cubic feet per second (cusecs) during peak flood conditions, facilitating sediment management and downstream flow control.^[1]^[14] Ancillary structural elements include head regulators and siphons linking to irrigation canals on both banks, as well as afflux embankment connections that extend the controlled river section upstream. The foundation and apron, engineered to withstand high sediment loads characteristic of the Himalayan foreland river, support the barrage's stability amid frequent high-velocity flows.^[4]

Operational Capacity

The Koshi Barrage is equipped with 56 main sluice gates, along with 6 under-sluice gates on the left bank and 4 on the right bank, allowing for precise control of river discharge to mitigate flooding and facilitate irrigation.^[15] These gates enable the structure to regulate flows from the Koshi River, which has a mean annual discharge of approximately 2,166 m³/s but can surge significantly during monsoons.^[16] The barrage's design flood capacity is 27,000 m³/s (about 950,000 cusecs), representing the maximum discharge it can handle through full gate opening without overtopping, based on hydrological assessments of historical peaks like the 1954 flood of 24,200 m³/s.^[15]^[12] Spanning 1,150 meters in length, the reinforced concrete structure maintains a limited pondage upstream for sediment management and flow diversion, though it functions primarily as a run-of-river facility without significant storage.^[16] Irrigation operations draw from the barrage via the Eastern Kosi Main Canal, designed for a discharge of 45 m³/s, irrigating a culturable command area of 612,000 hectares across districts in Bihar, India, primarily during the rabi and kharif seasons.^[1]^[17] A smaller Western Kosi Canal supplements this, contributing to a total irrigated area exceeding 900,000 hectares when combined with downstream systems, though actual utilization varies due to siltation and maintenance issues.^[18] Operational protocols prioritize flood discharge during high inflows, often opening all gates when levels exceed safe thresholds, as observed in events reaching over 300,000 m³/s in recent monsoons.^[15]

Intended Purposes

Flood Control Objectives

The Koshi Barrage was principally designed to mitigate recurrent flooding in the downstream Bihar plains of India, where the Koshi River—fed by Himalayan monsoons and prone to avulsions—has historically inundated vast areas, displacing populations and destroying agriculture.^[16]^[19] The structure sought to stabilize the river's braided channel and regulate peak discharges, addressing the river's average annual flood flows exceeding 7,000 cubic meters per second while handling extremes that previously caused widespread damage across approximately 21,000 square kilometers of arable land.^[20]^[19] Under the 1954 Indo-Nepal Kosi Agreement, flood control emerged as the paramount goal, prioritizing the prevention of the Koshi's lateral shifts and sediment-laden floods over ancillary benefits like irrigation.^[16]^[21] The barrage's 1,149-meter length and 56 gated spillways were engineered to discharge up to 950,000 cubic feet per second (26,900 cubic meters per second), calibrated to the estimated probable maximum flood based on hydrological records from the early 20th century.^[1]^[12] This capacity aimed to attenuate peaks by controlled releases, theoretically reducing downstream water levels and erosion while maintaining the barrage's integrity during monsoons.^[15] Operational objectives included real-time gate management to route monsoon surges, minimizing overbank spilling and channel migration, with the barrage serving as a hydraulic control point to enforce a fixed alignment southward into India.^[1]^[19] Unlike storage dams, the run-of-the-river configuration emphasized pass-through regulation without significant impoundment, relying on the gates' vertical lift mechanism to balance upstream pond levels against downstream safety thresholds during events where historical peaks reached or exceeded design limits.^[21] This approach targeted a reduction in flood-prone area exposure, though empirical assessments later highlighted limitations from siltation and underestimation of sediment transport dynamics.^[16]

Irrigation and Water Management

The Koshi Barrage diverts water from the Koshi River into the Eastern and Western Koshi Canals to support irrigation in the alluvial plains of Bihar, India, with the Eastern Canal off-taking from the left bank and the Western Canal from the right bank.^[15] The Eastern Koshi Canal system irrigates an annual area of 612,000 hectares across seven districts, including Supaul, Saharsa, Madhepura, Purnea, Katihar, Araria, and Khagaria, incorporating subsidiary networks like the Rajpur Canal System covering an additional 117,000 hectares.^[15] The Western Koshi Canal irrigates 356,600 hectares in Bihar's Mithilanchal region, contributing to a total barrage-irrigated area of 969,100 hectares in India.^[1] These canals operate primarily during the non-monsoon seasons, with the Western Canal designed for a discharge capacity of 4,000 cubic meters per second to ensure reliable water supply for crops such as rice, wheat, and sugarcane.^[22] In Nepal, irrigation from the barrage relies on lift systems rather than gravity-fed canals, as the 1954 Kosi Agreement granted Nepal rights to withdraw water for irrigation but initially lacked specific provisions for direct barrage allocations, prompting supplementary infrastructure.^[8]^[23] The Koshi Pump Irrigation System (KPIS), operational since the 1970s, lifts water to irrigate 13,180 hectares in Saptari District using pumps with a total capacity supporting distribution across primary and secondary canals.^[22] The smaller Chanda Mohana Irrigation System covers 1,800 hectares, split between eastern (1,000 hectares) and western (800 hectares) main canal networks.^[24] These systems provide year-round irrigation potential, though actual coverage varies due to operational constraints like pump maintenance and siltation, with KPIS often achieving only 5,000–6,000 hectares in practice.^[22] Water management at the barrage prioritizes equitable seasonal releases for irrigation while balancing flood control, with gates adjusted to maximize dry-season diversions and minimize wastage during monsoons under joint India-Nepal oversight as amended in the 1966 Kosi Agreement.^[9] Routine operations include sediment flushing to prevent canal clogging, which affects irrigation efficiency, and monitoring via gauging stations to allocate flows based on downstream demands.^[22] Despite these measures, challenges persist, including unequal benefits favoring India and Nepal's limited access to gravity canals, leading to calls for renegotiation to enhance Nepal's irrigation equity.^[23]

Ancillary Functions

The Koshi Barrage serves as a critical transportation link, functioning as a bridge that accommodates vehicular, bicycle, and pedestrian traffic across the Koshi River, connecting Saptari and Sunsari districts in Nepal.^[25]^[8] This infrastructure has historically been the primary crossing point for the East-West Highway, enhancing regional connectivity until alternative bridges were constructed following flood damages.^[26] Beyond its primary roles, the barrage supports ancillary erosion control measures, with the 1954 Koshi Agreement stipulating provisions to prevent riverbank erosion upstream in Nepal through associated headworks and future soil conservation efforts like check dams and afforestation.^[8] These elements aim to stabilize the river's course in vulnerable Nepalese territories, though implementation has focused more on immediate structural reinforcements than extensive upstream interventions. The structure also facilitates local fisheries by providing improved access to fishing grounds along the river, serving as a hotspot for artisanal capture fisheries, particularly for species in the Gangetic river dolphin habitat downstream.^[27]^[28] This has drawn fishers and supported small-scale livelihoods, with the barrage's sluice gates influencing seasonal fish migration patterns and concentrations near the site.^[29] Additionally, the barrage has emerged as a recreational and tourism site, attracting visitors for birdwatching, leisure, and observation of the river ecosystem, including rare species like the Ganges river dolphin.^[30]^[31] Its role as a public vantage point has fostered informal economic activities, though this use remains secondary to operational constraints during high flows.^[25]

Operational Performance

Initial Years and Routine Management

The Koshi Barrage commenced operations on March 31, 1963, following the closure of its steel doors to regulate the river's flow.^[7] This marked the initial phase of active flood control and water diversion, with the structure's 56 gates enabling controlled discharge during the ensuing monsoon season. Formal inauguration occurred on April 24, 1965, by King Mahendra of Nepal, signifying the completion of the project's primary infrastructure.^[7] Early performance demonstrated partial success in mitigating downstream flooding in Bihar, India, though the river's high sediment load—exceeding 100 million cubic meters annually—prompted immediate concerns over silt accumulation behind the barrage.^[32] In the first decade post-commissioning, operations focused on balancing flood attenuation with irrigation releases through the Eastern and Western Koshi Canals, which began supplying water to approximately 1.2 million acres of farmland in Bihar by the late 1960s.^[33] However, initial years were marred by embankment breaches, including one in 1963, highlighting vulnerabilities in the afflux bunds and the need for adaptive management strategies amid the Koshi's braided channel dynamics.^[32] These incidents underscored the barrage's limitations as a run-of-the-river structure without significant storage capacity, relying instead on real-time gate adjustments to handle peak flows reaching over 20,000 cubic meters per second.^[1] Routine management, as stipulated in the 1954 Koshi Agreement and its 1966 revision, assigns primary responsibility to the Government of India, including operation, maintenance, and repairs under a 199-year lease.^[8] Daily protocols entail continuous hydrological monitoring via gauges upstream and downstream, with gate operations calibrated to maintain pond levels below the maximum water level of 81.2 meters while facilitating silt ejection through dedicated sluices.^[1] Maintenance activities involve annual inspections of structural integrity, lubrication of radial gates, and embankment reinforcement, though persistent siltation has necessitated frequent dredging and scour interventions to preserve hydraulic efficiency. Coordination occurs through bilateral mechanisms, such as the Koshi Project Implementation Committee, ensuring compliance with treaty obligations for equitable water sharing and disaster response.^[34]

Major Flood Incidents

The Koshi Barrage's associated embankments have breached multiple times since the structure's completion in 1959, contributing to recurrent flooding despite the intended flood control measures. Records indicate eight embankment breaches since 1962, with nine major flood events between 1956 and 2008 attributed to failures near Kusaha, approximately 12 km upstream of the barrage along the Indo-Nepal border.^[35]^[32] These incidents highlight vulnerabilities stemming from the river's high sediment load, which promotes channel migration and undermines embankment stability, rather than direct overtopping of the barrage itself. The most catastrophic breach occurred on August 18, 2008, when the eastern embankment at Kusaha failed over a 700-meter section (chainage 12.1 to 12.9 km upstream of the barrage), releasing floodwaters estimated at 3,675 to 4,320 cubic meters per second.^[20]^[4] The event displaced approximately 60,000 people in Nepal's Sunsari district and affected over 2.3 million in Bihar, India, inundating 500 square kilometers across five districts and causing at least 500 deaths, with economic losses exceeding $500 million.^[36]^[37] The river avulsed eastward, reverting to a pre-barrage channel course not seen since 1896, which exposed systemic issues including silt accumulation reducing the barrage's headroom and inadequate embankment reinforcement against lateral erosion.^[38]^[18] Subsequent investigations attributed the 2008 failure to a combination of heavy monsoon precipitation in the upstream catchment (exceeding 200% of normal in parts of Nepal and Tibet), prolonged neglect of desilting operations, and design limitations that failed to accommodate the Koshi's annual sediment influx of 100-120 million cubic meters.^[39]^[40] Temporary repairs using geo-bags and earthwork restored partial embankment integrity by late 2008, but the incident prompted bilateral reviews of the 1954 Koshi Agreement, revealing disparities in maintenance responsibilities between Nepal and India.^[37] While no embankment breach of comparable scale has recurred post-2008, the system has faced ongoing flood pressures, including seven major events in Bihar's lower Koshi basin from 2008 to 2017 that each caused over 100 fatalities, often linked to overbank spilling rather than structural failure.^[41] These underscore persistent challenges with siltation, which has raised the riverbed by up to 10 meters in some reaches, reducing the barrage's effective spillway capacity during peak monsoons.^[4]

Post-2017 Operations and Monitoring

Following the 2008 breach and subsequent reinforcements, operations at the Koshi Barrage have centered on routine gate regulation to manage monsoon-season inflows, with all 56 sluice gates periodically opened to avert structural overload during peak flows exceeding 300,000 cubic meters per second. For instance, on October 5, 2025, authorities opened all gates after the Saptakoshi River's discharge surpassed 336,000 cusecs, prohibiting heavy vehicle transit across the structure to mitigate vibrational stress.^[42] ^[43] Similar activations occurred in August and September 2025, with 28 and 27 gates respectively opened in response to rising levels, reflecting a reactive strategy reliant on real-time discharge thresholds rather than proactive upstream storage.^[44] ^[45] Maintenance responsibilities, assigned to India's Bihar state government under the 1954 Koshi Agreement (revised 1966), have involved periodic patching and anti-corrosion measures, though the 66-year-old structure—designed for a 25-year lifespan—exhibits deterioration including shaking during crossings and riverbed aggradation from unchecked siltation. In August 2025, Bihar allocated ₹27.78 crore for repairs to the barrage and associated irrigation canals, addressing erosion and sediment buildup that elevates flood risks by raising the upstream bed.^[46] ^[47] ^[48] Silt management remains ad hoc, with the Koshi annually transporting approximately 120 million cubic meters of sediment, contributing to channel instability and necessitating desilting efforts that have proven insufficient to prevent recurring high-water threats.^[14] ^[49] Monitoring protocols emphasize continuous gauging of water levels and flows at the barrage site, conducted by Nepal's Armed Police Force in coordination with Indian engineers, issuing red alerts and evacuation advisories when discharges approach danger marks.^[50] Transboundary early warning systems for the Koshi remain underdeveloped, with Nepal and India operating parallel national frameworks—relying on upstream gauges and basic hydrological models—but lacking integrated data sharing for real-time flood forecasting across borders, as highlighted in basin assessments.^[51] ^[52] Community-level pilots in Koshi tributaries incorporate local gauges and SMS alerts, yet broader implementation lags due to institutional silos and variable telemetry reliability.^[53] These efforts have enabled gate preemption in recent events but underscore vulnerabilities from silt-induced bed rises and climate-amplified monsoons, prompting calls for upgraded remote sensing and joint protocols.^[54]

Impacts and Assessments

Economic and Agricultural Benefits

The Koshi Barrage supports extensive irrigation networks primarily benefiting agricultural regions in Bihar, India, through the Eastern Kosi Canal and Western Kosi Canal systems. The Eastern Kosi Canal irrigates an annual area of approximately 612,000 hectares across seven districts, including subsidiary systems like the Rajpur Canal covering 117,000 hectares.^[15] The Western Kosi Canal, under development, extends irrigation to additional culturable command areas estimated at around 940,000 hectares in total for the project.^[55] These canals deliver regulated water releases from the barrage, enabling year-round cultivation in flood-prone alluvial plains previously limited by seasonal monsoon dependence.^[56] In Nepal, the barrage provides irrigation to a smaller command area of 24,480 hectares via the Koshi Pump Canal and Chandra Nahar systems, primarily in Saptari district.^[22] Cropping intensity in these systems reaches 170%, supporting rice, wheat, pulses, oilseeds, and vegetables, which has expanded cultivated land and diversified crop production compared to rain-fed agriculture.^[22] Irrigation from the barrage has facilitated multiple cropping seasons, with potential yield increases tied to consistent water availability, though actual productivity varies due to management and siltation issues.^[57] Economically, the irrigation infrastructure has enhanced agricultural productivity in Bihar's Kosi region, a key contributor to the state's rural economy, by reducing crop failure risks and enabling higher per-hectare outputs.^[56] Stable water supply supports cash crops and improves farmer incomes, with studies indicating broader livelihood gains from integrated flood management and irrigation.^[58] In Nepal's served areas, benefits include modest expansions in arable land use, though overall economic impacts remain limited relative to Bihar due to the smaller irrigated extent and operational challenges.^[22] The Koshi Barrage has induced substantial changes to the river's sediment dynamics, trapping high volumes of upstream silt—estimated at over 100 million cubic meters annually in peak flows—leading to rapid aggradation behind the structure and reduced downstream sediment transport. This alteration promotes channel incision and bank erosion in Nepal's Terai plains while contributing to subsidence and avulsion risks in Bihar, India, as the river seeks new paths due to sediment starvation.^[59]^[19] Aquatic ecosystems downstream have experienced biodiversity losses, particularly in fisheries, where the barrage obstructs migratory routes for species like mahseer and carps, degrading spawning grounds through flow regulation and silt accumulation. FAO assessments document habitat disruption from the structure, compounded by upstream erosion, resulting in diminished fish stocks; local surveys report an approximate 80% decline in Koshi River capture fisheries since construction. The adjacent Koshi Tappu Wildlife Reserve, a Ramsar-designated wetland, faces modified hydrology, with upstream impoundment creating lake-like conditions that favor sedimentation over dynamic flooding essential for wetland recharge, adversely affecting riverine species such as the Ganges river dolphin by eliminating riffles and rapids.^[29]^[60]^[61] Socially, riparian communities in Nepal and India, including Tharu and Majhi fishers, have seen livelihood erosion from depleted fisheries and restricted river access, with over 98% of local households in Koshi Tappu areas historically dependent on wetland resources now facing intensified pressure from resource scarcity. Embankment failures linked to barrage operations have exacerbated displacement during floods; for instance, the 2008 avulsion displaced approximately 50,000 people in Nepal and affected over 3 million in Bihar, destroying homes and farmland while highlighting inequities in transboundary risk allocation. These effects have heightened vulnerability for subsistence farmers, fostering chronic inundation and land loss without commensurate rehabilitation, as embankments confine floods into narrower, more destructive channels.^[29]^[62]^[37]

Effectiveness in Flood Mitigation

The Koshi Barrage, completed in 1962, was engineered with a peak discharge capacity of 950,000 cubic feet per second (approximately 26,896 cubic meters per second) across its 1,149-meter structure and 56 sluice gates, primarily to regulate floodwaters from the Saptakoshi River and protect downstream areas in Bihar, India, spanning roughly 15,000 square kilometers of alluvial plains.^[1]^[16] By storing excess water during monsoons and releasing it in controlled volumes, the structure has moderated peak flows during routine high-water events, averting inundation in designated embankment-protected zones for periods exceeding routine flood thresholds.^[20] However, empirical records indicate limited long-term efficacy against extreme floods, with the associated embankments—totaling about 120 kilometers—experiencing at least eight breaches since construction, including in 1963, 1968, 1984, 1987, 1991, 1993, 1995, and most catastrophically in 2008.^[35] The 2008 event, triggered by an upstream channel avulsion approximately 12 kilometers above the barrage, overwhelmed the eastern embankment due to superelevation from sediment accumulation, releasing over 1 million cusecs and flooding more than 500,000 hectares in Bihar, displacing around 3 million people and causing over 500 deaths.^[4]^[40] This failure highlighted the barrage's inability to fully constrain the river's dynamic morphology, as the structure succeeded in containing major Bihar inundations for nearly 50 years prior but proved vulnerable to sediment-induced instability.^[20] A primary causal limitation is the barrage's role in exacerbating siltation, as the Koshi transports approximately 120 million cubic meters of sediment annually from Himalayan erosion, much of which deposits upstream, raising the riverbed at rates of about 0.12 meters per year and creating superelevated channels prone to breaching.^[14]^[19] This aggradation reduces storage capacity and heightens pressure on embankments during peaks exceeding design limits, such as the 1.7 million cusecs recorded in 2008, transforming the barrage from a mitigator into a sediment trap that amplifies flood risks over time.^[49] Assessments from hydrological studies conclude that while the barrage provides short-term flow regulation—evidenced by controlled gate operations during monsoons to prevent downstream surges—its overall flood mitigation has been undermined by unaddressed sediment dynamics, leading to recurrent avulsions and expanded flood-prone areas in Bihar, now exceeding 6.8 million hectares despite structural interventions.^[4]^[63] Sustained effectiveness requires integrated sediment management, as the current configuration prioritizes containment over the river's inherent braiding and migratory tendencies.^[59]

Controversies and Criticisms

Inequities in the Koshi Agreement

The Koshi Agreement, signed on April 25, 1954, between India and Nepal, established the framework for constructing and operating the Koshi Barrage primarily on Nepalese territory to manage floods and provide irrigation, but it allocated operational authority disproportionately to India. Under the treaty, India retained the right to regulate river flows at the barrage site, maintain the structure, and utilize surplus water for its irrigation needs in Bihar, while Nepal's role was limited to providing land and limited downstream irrigation benefits through projects like the Sunsari Morang Irrigation Scheme, which covers only about 54,000 hectares. This arrangement has been criticized in Nepal for favoring India's flood protection for over 3.5 million hectares of farmland in Bihar, with Nepal receiving minimal reciprocal hydropower or equitable water allocation despite originating 10% of the river's catchment area in its territory.^[6]^[23] A core inequity stems from India's control over the barrage gates and embankments, enabling it to prioritize downstream flood control in India, which has exacerbated flood vulnerabilities in Nepal during events like the 2008 breach that displaced over 50,000 Nepalese residents and caused eight major floods in Nepal over the treaty's first 55 years. Nepal bears the primary siltation burden, with the barrage accumulating over 1.5 billion cubic meters of sediment since 1963, reducing storage capacity and shifting the river's course within Nepalese borders, yet maintenance responsibilities and costs fall unevenly, with India directing operations without mandatory consultation on gate openings that affect upstream Nepalese communities. Critics in Nepal, including opposition leaders at the time of signing, argued the treaty compromised national sovereignty by allowing extraterritorial control, a view echoed in public protests and parliamentary debates labeling it "unequal" due to the absence of provisions for Nepal's hydropower development or revenue sharing from India's gains.^[6]^[64]^[65] Compensation disputes further highlight imbalances: India refused to provide direct payments for approximately 4,500 hectares of Nepalese land submerged or acquired for the project, offering instead indirect benefits like roads and irrigation canals that Nepalese stakeholders deemed inadequate, leading to ongoing friction despite a 1966 revision that extended the treaty to 1996 and clarified some maintenance roles but did not address water equity or upstream development rights. Nepali analyses contend this reflects power asymmetry in negotiations, with India leveraging its technical and financial dominance to secure primary benefits, while Nepal's limited bargaining position—amid post-Rana regime instability—resulted in a deal prioritizing India's Bihar flood plains over holistic basin management. Post-2008 floods revived calls in Nepal for treaty renegotiation, citing empirical evidence of disproportionate disaster impacts, such as the 2024 floods prompting fresh scrutiny of gate management protocols that allegedly delayed releases benefiting Indian territories at Nepal's expense.^[6]^[65]^[23]

Maintenance Failures and Siltation

The Koshi River, originating in the Himalayas, transports an estimated 120 million cubic meters of silt annually due to intense upstream erosion, which accumulates primarily upstream of the barrage and within its structure, raising the riverbed and diminishing the barrage's operational head and flood storage capacity.^[14] Numerical modeling indicates a reach-averaged sedimentation rate of approximately 0.1 meters per year immediately upstream of the barrage, while post-construction aggradation rates have averaged around 0.12 meters per year, exacerbating channel instability and reducing the structure's effectiveness in controlling peak flows.^[66]^[20] Maintenance efforts have historically fallen short of addressing this sediment influx, with desilting operations limited and non-systematic; for instance, the Bihar government stated in 2020 that it had no concrete plan for desilting the Koshi, despite the barrage's design relying on periodic sediment removal to maintain functionality.^[67] This neglect contributed to structural vulnerabilities, as unchecked siltation upstream promotes river avulsion and embankment breaches, evident in the 2008 disaster where heavy sediment buildup played a key role in the failure of the eastern embankment, displacing over 3 million people.^[68]^[20] Under the 1954 India-Nepal Koshi Agreement (amended 1966), India bears primary responsibility for barrage operation and maintenance, yet upstream sedimentation management has been hampered by transboundary coordination gaps and insufficient dredging infrastructure.^[69] Recent assessments highlight ongoing deficiencies, with strategic dredging recommended to restore water-holding capacity along critical reaches, but implementation remains sporadic; post-2024 floods prompted intensified state-level efforts, including studies for silt utilization estimated at 64,350 cubic meters annually over a decade, though historical underinvestment has allowed sediment volumes to overwhelm routine gate operations and scour mechanisms.^[59]^[14]^[49] These failures not only accelerate barrage degradation—through uneven scour on gates and piers—but also amplify flood risks downstream, as silt-laden flows bypass the structure via breaches or overtopping, underscoring the need for engineered sediment bypassing or upstream reservoirs to mitigate long-term viability.^[40]

Transboundary Disputes

The Koshi Agreement of April 25, 1954, between Nepal and India authorized the construction of the barrage approximately 3 miles upstream of Hanuman Nagar on the Koshi River, primarily to mitigate floods in India's Bihar state through embankments and irrigation infrastructure, with India retaining operational control over the structure.^[8] Nepal has long contested the agreement's terms as unequal, arguing that it cedes excessive sovereignty by granting India perpetual management rights over Nepalese territory and resources without adequate compensation for upstream flood risks and siltation burdens borne by Nepal.^[6] ^[70] An amendment on December 19, 1966, addressed some procedural aspects but failed to resolve core inequities, such as Nepal's limited input on barrage operations affecting its riparian communities.^[71] ^[72] The 2008 embankment breach at Kusaha in Nepal's Sunsari district, which displaced over 60,000 people in Nepal and caused widespread flooding in Bihar, intensified disputes over maintenance responsibilities.^[36] Nepalese analyses attributed the failure partly to unaddressed sedimentation upstream of the barrage, exacerbated by India's delayed dredging and embankment repairs, rendering the flood "manmade" despite warnings.^[20] Indian assessments countered that Nepal's upstream encroachments and deforestation contributed to excessive silt loads, neglecting joint maintenance obligations under the treaty.^[73] These recriminations highlighted asymmetric flood risk governance, with Nepal bearing initial breach impacts while India focused on downstream protections stipulated in the 1954 accord.^[74] Territorial frictions persist, including claims of Indian encroachments near the barrage in Sunsari district, where locals assert the border should follow the river's current course rather than fixed pillars, displacing Nepalese farmland.^[75] Broader hydropolitical tensions frame India as exerting hegemony through treaty terms that prioritize Bihar's flood attenuation over equitable basin management, prompting Nepalese calls for revisions to incorporate modern data on climate variability and shared siltation mitigation.^[76] ^[77] Despite bilateral dialogues, unresolved inequities in water allocation and disaster response continue to strain relations, with Nepal advocating for upstream hydropower integration to balance concessions.^[78]

Recent Developments and Future Outlook

Ongoing Risks and Repairs

The Koshi Barrage continues to face significant risks from excessive siltation, which deposits approximately 120 million cubic meters of sediment annually, elevating the riverbed and reducing channel capacity for floodwaters.^[14]^[59] This aggradation exacerbates flood vulnerability, as evidenced by the 2024 monsoon floods in Nepal and Bihar, where silt buildup contributed to overflows despite gate operations.^[14] Structural aging poses additional threats; the 66-year-old barrage exhibits dilapidation, including shaking under vehicle loads and corrosion from debris-laden flows, heightening breach potential during high-discharge events.^[5]^[79] Recent flood episodes underscore these hazards. In October 2025, the Saptakoshi River's water level surpassed danger thresholds, prompting authorities to open all 56 sluice gates to avert overflow, though levels remained elevated post-rainfall cessation.^[80]^[81] Debris accumulation at piers and gate slots during such events further risks hydraulic inefficiencies and localized erosion, though no immediate structural collapses were reported.^[46]^[82] Neglect of riverbed elevation and bank choking by sand amplifies avulsion risks, where the channel may shift course downstream.^[46]^[83] Repair efforts include periodic maintenance to address embankment breaches and silt-induced damage, with Bihar allocating ₹27.78 crore in August 2025 for barrage repairs, irrigation enhancements, and flood safeguards through 2030.^[84] Routine seasonal work on spurs and embankments occurs, yet experts note these measures inadequately counter long-term siltation and aging without comprehensive upgrades.^[85] Ongoing monitoring via gate status reports and water level alerts aims to mitigate acute threats, but persistent sediment flux demands sustained intervention to preserve integrity.^[59]

Proposals for Upgrades or Replacement

The Sapta Kosi High Dam project represents the principal long-term proposal to supersede or complement the functions of the aging Koshi Barrage, focusing on upstream flood control, hydroelectric generation, and expanded irrigation for both Nepal and northern India. Jointly developed under bilateral auspices since initial feasibility studies in the 1990s, the multipurpose dam at the Chatra gorge site on the Sapta Kosi River aims to impound floodwaters that have historically overwhelmed the barrage, which was designed for a peak discharge of 27,000 cubic meters per second but has proven inadequate during extreme events due to siltation and structural wear. The project envisions a reservoir capacity sufficient to regulate the river's volatile Himalayan flows, potentially reducing downstream flood risks in Bihar by storing peak monsoon volumes for controlled release.^[55] In October 2023, India and Nepal reached an agreement to lower the proposed dam height from 237 meters to address Nepalese apprehensions regarding upstream submergence of approximately 10,000 hectares of land and displacement of local communities, while preserving the structure's core flood-mitigation capacity of over 10 billion cubic meters. This redesign maintains the dam's power generation target of 3,000 megawatts and irrigation benefits for 1.1 million hectares across borders, with the barrage component relocated to Chatra, 8 kilometers downstream of the dam, featuring enhanced spillway and sediment management features absent in the 1950s-era Koshi Barrage. As of 2025, detailed engineering and environmental impact assessments continue, though implementation has stalled amid funding disputes and geopolitical tensions, with estimated costs exceeding $5 billion.^[86]^[87]^[55] Direct upgrades to the existing Koshi Barrage, such as retrofitting sluice gates with modern materials or expanding embankment resilience, have received limited attention, with bilateral efforts prioritizing ad-hoc repairs over comprehensive modernization. Constructed between 1959 and 1962 under the 1954 Kosi Agreement (revised 1966), the barrage's 56 gates and concrete structures, built without contemporary seismic or silt-handling technologies, exhibit accelerating deterioration, yet neither government has committed to a full replacement timeline. In August 2025, Bihar state authorities approved ₹27.78 crore (approximately $3.3 million) for maintenance and irrigation enhancements through 2030, extending operational viability but not resolving underlying vulnerabilities like annual silt deposition exceeding 100 million cubic meters. Independent engineering assessments indicate that without upstream intervention like the high dam, the barrage's flood-passage efficacy will diminish further by the 2030s due to foundation erosion and gate misalignment.^[5]^[84]^[5]

References

[1]
[PDF] The Koshi Barrage was built between 1959 and 1962 after an ...
The barrage is located at Bhim Nagar, Nepal close to the India-Nepal border. The barrage was constructed for flood control and to provide water for irrigation.
[2]
A dammed history of the Koshi | Dialogue Earth
Aug 15, 2018 · Embankment construction commenced in 1955, and continued until 1959. The construction work utilized heavy earth-moving equipment and also ...
[3]
[PDF] Floods are a serious problem in the Koshi River basin and
On 18 August 2008, the eastern embankment of the Koshi river breached at Kushaha, 12 km upstream of the barrage. After the breach, most of the monsoon discharge ...
[4]
Basin-scale hydrology and sediment dynamics of the Kosi river in ...
Nine breaches have occurred since 1963 on both eastern and western embankments, resulting in severe flooding (Mishra, 2008, Sinha et al., 2014). The latest ...<|control11|><|separator|>
[5]
Expired Koshi Barrage poses growing threat | The Annapurna Express
Aug 29, 2025 · It has been 15 years since the Koshi Barrage, built on the Saptakoshi River, outlived its designated lifespan. Yet, despite the expiry of ...
[6]
Revisiting the Kosi Agreement: Lessons for Indo-Nepal Water ... - IDSA
Sep 22, 2008 · India and Nepal signed the Kosi agreement in 1954 to regulate the flow of the river and ensure flood management. A barrage straddling the India ...
[7]
The Essence of Kosi Treaty and Kosi High Dam
May 2, 2024 · On April 30, 1959, King Mahendra of Nepal laid the foundation stone of the Kosi Barrage. The then Prime Minister of India, Pandit Jawaharlal ...<|separator|>
[8]
Agreement Between the Government of India and the Government of ...
This agreement made this twenty fifth day of April, 1954, between the Government of the Kingdom of Nepal (hereinafter referred to as the “Government”) and the ...
[9]
Revised Agreement on Chose Project Annexure, Agreement 25 ...
This present Agreement shall supersede the Agreement signed between the Government of Nepal and the Government of India on the 25th April, 1954 on the Kosi ...
[10]
[PDF] The Hydro-political History of the first Indo-Nepal Koshi River ...
Thus, after much trials & tribulations the Koshi River agreement was signed between India & Nepal in 1954. In this connection, a 1,150-meter barrage was built ...
[11]
Nine Important Facts About Koshi Barrage Of Nepal - Purbeli news
6. Two different agreements of Koshi. In order to manage Koshi and construct Koshi Barrage, Koshi Agreement was first made in 25 April 1954. However, in order ...Missing: history | Show results with:history
[12]
[PDF] HYDROLOGY - National Water Development Agency
Accordingly a 1149 m long Hanuman Nagar barrage (Kosi barrage) was constructed near Bhimnagar village located at a distance of 48 km below Chatra with pond ...
[13]
FEATURE NEWS: Nine important facts about Koshi Barrage of Nepal
Aug 16, 2020 · With 56 sluice gates to regulate water, the 1150-metre-long and 10-metre-wide Barrage connecting Sunsari of State-1 and Saptari of State-2, has ...
[14]
Silt, a major reason for Kosi river's flooding - Mongabay-India
Nov 25, 2024 · The Kosi river carries around 120 million cubic metres of silt annually that collects on the riverbed and increases the risk of flood.Missing: breaches | Show results with:breaches
[15]
Kosi Barrage and Eastern Canal Major Irrigation Project JI02121
The work of Kosi Barrage project was started in the year 1955 and completed in July 1963. There are 56 Gates including 6 Nos. Under Sluice Gates on the left ...
[16]
[PDF] Water induced disasters, Flood Hazard Mapping & Koshi flood ...
Feb 23, 2009 · Barrage has a discharge capacity of 950,000 cusecs ( 26896 m3/sec) in a peak flood. Koshi project. • Agreement in April, 1954. • 1150 m long ...
[17]
[PDF] BIHAR KOSI FLOOD (2008) NEEDS ASSESSMENT REPORT
Jun 26, 2010 · The Kosi Cultivable. Command Area (CCA) is 612,000 hectares in the five districts. ... irrigation network in the Kosi Command Area dysfunctional.
[18]
[PDF] The Kosi Pralaya Could the Catastrophe have been Averted? And ...
The Kosi river breached due to lackadaisical maintenance. Warnings were ignored, and timely action could have averted the disaster.
[19]
Effect of the barrage and embankments on flooding and channel ...
The major aim of Kosi barrage was to control flood in Bihar; irrigation, hydroelectricity generation, land reclamation, fishing and navigation were less ...Missing: goals | Show results with:goals
[20]
[PDF] Effect of the barrage and embankments on flooding and channel ...
Situated in the Nepal's eastern Ganges region, the braided. Koshi River is unique among the other rivers, because of the high frequency of channel avulsion and ...Missing: specifications | Show results with:specifications
[21]
[PDF] An Engineered and Sustainable Solution for Flood and Sediment ...
Oct 1, 2021 · The 'Kosi project' was formulated in 1954 aiming flood control, irrigation and hydropower generation in the Kosi basin under a bilateral ...Missing: Koshi | Show results with:Koshi
[22]
Situational and sustainability assessment of irrigation systems to ...
Oct 20, 2023 · The Koshi Barrage was constructed mainly for the flood control in the Indian State of Bihar and to the Saptari district of Nepal acquiring the ...
[23]
Nepal–India water cooperation: consequences of mutuality or ...
Oct 30, 2020 · ... Kosi Agreement had no provision for providing water to Nepal for irrigation purposes. The provisions related to the sovereignty of the ...Missing: Koshi | Show results with:Koshi
[24]
Introduction - Chanda Mohana Irrigation Management Office
The overall span of existing weir is 65 m with Weir portion: clear span as 40 m, crest height = 3 m, gate height = 1.5 m, and Undersluice portion: opening as 7 ...<|separator|>
[25]
Top 7 facts about Koshi Barrage - Skill Sewa
Oct 28, 2022 · In 1958-1962 it was built and it has 58 gates. It is 1150 mt. long and 10 mt. wide. It was constructed after the Koshi Agreement. In India, it ...
[26]
Koshi gets alternative crossing - The Kathmandu Post
Dec 17, 2018 · “The new highway and bridge constructed over the Koshi River in Chatara will serve as an alternative to Koshi Barrage if there is flooding ...Missing: function | Show results with:function
[27]
Characterization of the artisanal fishing communities in Nepal and ...
Jan 12, 2016 · According to Chaudhary (2007), a hotspot for the GRD is the southern section of the Koshi barrage, which is also a popular fishing spot.
[28]
livelihood of koshi bridge - Philanthropic Narrator
Sep 13, 2023 · The Koshi Bridge, also known as the Koshi Barrage, is a significant infrastructure project that spans the Koshi River in Nepal.
[29]
Survey of capture fisheries in the Koshi River basin. (by S. Yadav)
The waters of Nepal provide a variety of habitats for indigenous fish, water for irrigation and for hydropower generation. 2. FISH AND FISHERIES. Koshi is the ...Missing: navigation | Show results with:navigation
[30]
Koshi Barrage - Atlas Obscura
Apr 14, 2022 · Equipped with 56 gates spaced across a 1,150-meter (3,772-foot) expanse, the barrage has had some success managing the temperamental waterway, ...<|separator|>
[31]
[PDF] Small–Scale Fishing Communities, Fishing Gears and ... - TBTI Global
Koshi barrage has become a notable social destination for fishers, tourists, birdwatchers, and residents. The Koshi barrage was commissioned following an ...
[32]
The Kosi and the Embankment Story - ResearchGate
Aug 6, 2025 · On many past occasions, the embankments were breached causing flash floods, especially in the years 1963, 1968, 1971, 1980, 19841987, 1991 ( ...<|separator|>
[33]
Nine important facts about Koshi Barrage of Nepal - Khabarhub
Aug 17, 2020 · Two different agreements of Koshi In order to manage Koshi and construct Koshi Barrage, Koshi Agreement was first made on 25 April 1954. ...Missing: initial routine
[34]
Ten years since Koshi embankment breach - Onlinekhabar English
Aug 20, 2018 · India would pay for the project and operate the barrage under a 199-year lease. In 1954, the two countries signed the Koshi Agreement, and ...
[35]
The Koshi River Floods in Bihar: Past, Present and Future - Soanas
Aug 16, 2023 · The embankments have also brought other impacts. They occasionally breach; in fact, since 1962, the Koshi embankments have breached eight times.
[36]
2008 Kosi Flood - AquaPedia Case Study Database
Jun 26, 2013 · The breach site for the 2008 flood was in Nepal, and most of the flood impacts there occurred in the Sunsari districts, with about 60,000 people ...
[37]
[PDF] Bihar Kosi Flood Recovery Project - World Bank Documents & Reports
When the water level rises too high, Nepal opens the sluice gates of the Kosi Barrage to protect the structures. This leads to flooding and water-logging in ...
[38]
The 18 August 2008 Kosi river breach: an evaluation - ResearchGate
The 2008 sediment influx in the Koshi River of the eastern plains of Nepal leading to the dam failure, and consequent displacement of more than fifty-thousand ...
[39]
Catastrophic floods in Kosi catchment during August 2008
Jan 1, 2011 · The breach is due to incorrect strategies of river management, human negligence and poor maintenance of afflux bund of the barrage (Sinha, 2009) ...Missing: Koshi | Show results with:Koshi
[40]
Consequences of Koshi flood 2008 in terms of sedimentation ...
Jan 31, 2017 · The intense problem of sedimentation of the Koshi in the low land is frequent and the sedimentation hazards are always seen particularly in the ...
[41]
[PDF] Studying the Historical Implication of Koshi Flood in Northern Bihar
Oct 31, 2020 · The data of historical change of courses of. Koshi river has been taken from the master plan for Flood and Sediment Management in Kosi River.Missing: goals | Show results with:goals
[42]
Koshi Barrage opened All It Door after High water Level
All gates were opened after water flow in Koshi reached above 336,000 cusecs. Currently, the operation of vehicles in the barrage is prohibited.
[43]
All 56 sluice gates of Koshi Barrage opened, authorities urge caution
Continuous monitoring of the river's water level is currently in progress. He shared that due to the ongoing rise in water levels, a red ...
[44]
28 gates of Koshi Barrage opened following rise in water level
Aug 10, 2025 · With this development, 28 out of 56 sluice gates at the Koshi Barrage have been opened. According to the Armed Police Force (APF) Nepal No. 4 ...
[45]
27 gates of Koshi Barrage opened after water level rises - Khabarhub
Sep 17, 2025 · DHARAN: Rising water levels in the Saptakoshi River have led to the opening of 27 gates of the Koshi Barrage.
[46]
Koshi Barrage faces growing risks amid rising riverbed, neglect
Oct 6, 2025 · “Engineers have already declared that the bridge has outlived its lifespan. However, the government keeps patching and painting it instead of ...
[47]
Bihar Approves ₹27.78 Crore for Kosi Barrage Repair and Irrigation ...
Aug 19, 2025 · Bihar's Kosi Barrage Gets ₹27.78 Crore for Maintenance – Securing Water, Farms, and Futures The River That Feeds Bihar For millions in Bihar ...
[48]
Transboundary river governance and climate vulnerability ...
Apr 26, 2023 · This study addresses how Koshi River governance contributes to the vulnerability of riverine communities in Nepal by drawing upon ideas about vulnerability and ...Missing: goals | Show results with:goals<|separator|>
[49]
Sustainable Silt Management in the Lower Kosi River, North Bihar ...
Some of the key risks analyzed in the present study in Kosi River are: Mandatory usage of silt for construction purposes may result in delay of the projects.
[50]
Water level recedes in Koshi Barrage | The Annapurna Express
Oct 6, 2025 · Currently, all 56 gates have been opened, said Thapa. Continuous monitoring of the river's water level is currently in progress. It is said that ...
[51]
(PDF) Assessment of Trans-Boundary Early Warning System in ...
It provides useful findings from a mixed review and assessment of trans-boundary early warning systems conducted under the project for both the Koshi river ...
[52]
(PDF) Exploring flood modelling in the Koshi River Basin
Mar 23, 2024 · Several flood forecasting techniques are available, ranging from simple approaches such as real-time upstream water level (WL) monitoring, ...
[53]
Community Assessment of Flood Risks and Early Warning System in ...
this paper evaluates the progress of a community-based flood early warning system implemented in the Ratu River—a small tributary of the Koshi River ...Missing: Barrage | Show results with:Barrage
[54]
Assessment of channel migration of Koshi River in Nepal using ...
Between 1999 and 2019, the area of the water channel is reduced by 24.08 km2 whereas, the channel bars have increased by 68.08 km2. The river was observed ...
[55]
[PDF] Feasibility Report of Sapta Kosi High Dam Project Prepared by
7 The Project, therefore, envisages the construction of new barrage at Chatra which would be 8 km (5 miles) down stream of the proposed Kosi High Dam, with two ...
[56]
World Bank Approves US$ 250 Million for Bihar Kosi Basin ...
Dec 8, 2015 · “Flood risk management, improved irrigation, improved connectivity to markets, and increased agricultural productivity will build on each other ...
[57]
Impacts of climate change on the flow of the transboundary Koshi ...
Nov 6, 2020 · Irrigation is a key driver for expansion of crop area coverage and an important input for increased agriculture production per hectare.
[58]
How Can The Problems Of Koshi Region Be Addressed Through A ...
Nov 21, 2020 · It found out that significant economic benefit could be achieved if the development of the Koshi basin is thought from water, energy and food nexus.
[59]
[PDF] Sediment management in the Koshi basin - ICIMOD
Anthropogenic interventions such as embankments, barrages, and hydroelectric projects significantly influence downstream conveyance of water and sediment ...
[60]
Dams and embankments in the Ganga-Kosi floodplains, BR, India
Jun 14, 2023 · Other Environmental impacts. Greenhouse gas emissions from submerged aquatic vegetation in waterlogged areas may be high. Health Impacts.
[61]
August 2007 The major threats to the Ganges river dolphins in the ...
Barrage and embankments: The Koshi Barrage has altered the habitat of dolphins by making the river section upstream of the barrage like a lake and eliminating ...
[62]
Koshi flood victims struggle on - Dialogue Earth
Jun 2, 2015 · An estimated 50,000 people were displaced in Nepal and more than three million in India. That afternoon, like the days before, hundreds of ...Missing: effects communities
[63]
How engineering attempts to 'tame the Kosi' have only added to ...
Oct 26, 2020 · Even as 3,500 km of levees have been built in Bihar for flood protection, the flood-prone area has quadrupled to 6.8 million hectares. Even ...
[64]
[PDF] TAF_Issue brief_Nepal_1 - ISET-Nepal
The 1954 Kosi Agreement was heavily criticized by opposition leaders in Nepal who felt the Agreement favored India more than Nepal. As a result, the ...Missing: inequities criticisms
[65]
Nepal-India Water Relations: Time for Change in Approach - jstor
Barrage Agreement of 1920 is the first agreement between Nepal and. India which is still valid.4 After this agreement, the two countries have concluded a ...
[66]
Effects of Koshi River damming on sedimentation and channel ...
The numerical modelling allowed estimating the reach averaged sedimentation rate of 0.1 m/year upstream of the barrage. Analysis of ground data and ...
[67]
No plan to desilt Kosi: Bihar govt - Down To Earth
Mar 5, 2020 · The Bihar government has said it has no plan to desilt the Kosi. The river, known as 'Sorrow of Bihar', overflows during rains, causing floods in several parts ...Missing: rate | Show results with:rate
[68]
The Kosi Disaster: Millions Flooded Out - International Rivers
Sep 4, 2008 · The floods from the Kosi embankment failures were more powerful than floods ... area supposedly protected by flood-control engineering projects ...<|control11|><|separator|>
[69]
Agreement To Build Bridges - PIB
Mar 31, 2022 · An India-Nepal Agreement on Kosi Project was signed in 1954 and amended in 1966, for building, operation and maintenance of Kosi barrage and ...
[70]
[PDF] India-Nepal: A historical journey through river waters, disputes ...
May 22, 2025 · However, the Koshi Barrage Agreement has not been controversy-free. While it gives India definite gains, concerns are raised in Nepal in ...
[71]
Full article: International water law and hydropolitics: an enquiry into ...
Feb 23, 2023 · This means that both India and Nepal agree not to claim any share of water that the other has been utilizing before the signing of the treaty.Missing: inequities | Show results with:inequities
[72]
[PDF] Amended agreement between His Majesty's Government of Nepal ...
WHEREAS the Union was desirous of constructing a barrage, headwords and other appurtenant works about three miles upstream of Hanuman Nagar town on the Kosi ...
[73]
Did Nepal 'neglect' lead to Kosi flood? - The Times of India
Aug 28, 2008 · India News: The genesis of the calamity could well lie in Kathmandu's apathy towards timely maintenance of the barrage that was breached.Missing: Koshi disputes
[74]
Along the Koshi, flooded in Nepal, ignored by India | Dialogue Earth
Aug 13, 2020 · Nepali officials say a 66-year-old agreement prevents them from being part of flood-control measures.
[75]
India encroaches upon Nepali territory near Koshi Barrage in Sunsari
May 10, 2024 · Locals from Koshi Rural Municipality-8 in Sunsari claim that the true Nepal-India border should align with the river's current position.Missing: transboundary | Show results with:transboundary
[76]
[PDF] an enquiry into the water conflict between India and Nepal
Feb 23, 2023 · Governance of transboundary water resources originating in the Himalayas and flowing through Nepal into India has been a source of bitterness ...<|separator|>
[77]
resistance of Nepal in the Upper Karnali and Saptakoshi dam project
Oct 31, 2021 · ... Koshi barrage under the bilateral Koshi agreement in Nepal in 1954. Since 1991, as a part of its river linking project(s), India has been ...
[78]
Rich water, poor people: Potential for transboundary flood ...
The Koshi Barrage, along the Nepal–India border, was constructed after the Koshi Agreement was signed between the governments of Nepal and India on 25 April ...Missing: post- | Show results with:post-
[79]
63 Years Standing Strong — The Mighty Koshi Barrage Still Guards ...
The Mighty Koshi Barrage Still Guards the Flow of Nepal's Sorrow River ” Built in the 1960s, the Koshi ...
[80]
All 56 gates of Koshi Barrage open: urged to remain alert
Oct 5, 2025 · At 8:15 AM, with the water flow exceeding 335,360 cubic meters per second, all 56 gates were subsequently opened, said Dharmaendra Kumar Mishra ...Missing: operational capacity
[81]
Water level recedes in Koshi Barrage but still is above risk level
Oct 6, 2025 · SUNSARI: The water level of the Saptakoshi River has gradually decreased today as torrential rainfall stopped in the region.Missing: 2023 2024
[82]
A recent glimpse of the floods in Nepal and Bihar at the Kosi ...
Oct 10, 2025 · **Debris accumulation risk at piers and possibly at gate slots is apparent. **No overt structural failure visible in the video, but hydraulic ...
[83]
The example of the Kosi River in eastern Nepal Himalaya
Oct 8, 2024 · Kale (2008) attributed the 2008 avulsion primarily to the excess sediment load that the river dumped as it exited the Himalaya and entered the ...Missing: Koshi | Show results with:Koshi
[84]
Bihar Approves ₹27.78 Crore for Kosi Barrage Repair and Irrigation ...
Aug 19, 2025 · Bihar approves ₹27.78 crore for Kosi Barrage maintenance till 2030. Boosting irrigation, farmer security, and flood safety.Missing: Koshi ongoing
[85]
Decades of embankment failures fuel fears along Koshi River
Jul 9, 2025 · Instead of building a durable flood defense system, India has relied on temporary measures like sandbags, bamboo reinforcements (trikhutti), and ...
[86]
Nepal, India agree to reduce height of Saptakoshi dam
Oct 16, 2023 · Nepal and India have agreed to reduce the height of the proposed Saptakoshi High Dam amid concerns in Nepal over the potential inundation.Missing: upgrading replacing
[87]
Nepal and India re-designing Koshi High Dam project to allay fears ...
Oct 24, 2023 · India and Nepal have agreed to lower the height of the Sapta Koshi high dam to allay fears about downstream flooding.Missing: upgrading replacing