The Ganga Treaty: Water Sharing Between India and Bangladesh

Rivers don’t recognise international borders, but governments do. When a river like the Ganga flows out of India and into Bangladesh, the question of who gets how much water becomes a question of diplomacy, economics, and survival. The Ganga Treaty of 1996 is the agreement that tries to answer exactly that question. It is one of the most important examples of transboundary water sharing in South Asia, and understanding it tells you a lot about how neighbouring nations cooperate (and clash) over a resource that neither can live without.

Why the Ganga became a point of conflict
The early attempts at a solution
What the 1996 Ganga Treaty actually says
The water-sharing formula
The emergency and safeguard clauses
The Joint Committee for monitoring
Why the treaty mattered
The criticisms and ongoing disputes
The road to 2026 and renewal
What the Ganga Treaty teaches about shared rivers

Why the Ganga became a point of conflict

To understand the treaty, you first need to understand the problem it was meant to solve. The Ganga originates in India and flows downstream into Bangladesh, where it is known as the Padma before draining into the Bay of Bengal. This makes India the upper riparian state (upstream) and Bangladesh the lower riparian state (downstream). Whatever India does to the river upstream directly affects the water that reaches Bangladesh.

The trouble began with the Farakka Barrage. India started building this structure in West Bengal in the 1950s and commissioned it in 1975. Its purpose was practical: by diverting Ganga water into the Bhagirathi-Hooghly river, the barrage would flush out silt and keep the Kolkata (then Calcutta) Port navigable. But there was a catch. Diverting water at Farakka meant less water flowing downstream into Bangladesh, especially during the dry season.

Bangladesh argued that the Ganga is an international river and that its waters must be shared through mutual agreement, not diverted unilaterally. The dispute escalated quickly. In 1976, Bangladesh took the matter to the United Nations General Assembly, which urged both countries to resolve it bilaterally. The reduced dry-season flow had real consequences across the border: damage to agriculture, fisheries, navigation, and increased salinity intrusion into Bangladesh’s deltaic regions.

The early attempts at a solution

The two countries did not arrive at the 1996 Treaty overnight. There was a long history of partial, temporary fixes. Back in 1972, soon after Bangladesh’s independence, India and Bangladesh set up the Joint Rivers Commission (JRC) as a permanent bilateral mechanism to manage shared rivers.

A series of short-term arrangements followed. A five-year agreement was signed in 1977, which notably included a guarantee clause ensuring Bangladesh a minimum share of the flow. After it expired, two Memoranda of Understanding were signed in the 1980s, but these dropped the guarantee clause. Then came a difficult gap: between 1989 and 1996, there was no operational agreement at all for sharing the Ganga’s waters. This vacuum made a long-term, formula-based solution urgent.

What the 1996 Ganga Treaty actually says

On 12 December 1996, then Indian Prime Minister H.D. Deve Gowda and Bangladeshi Prime Minister Sheikh Hasina signed the Treaty on Sharing of the Ganga/Ganges Waters at Farakka. It was designed as a 30-year agreement, valid from 1996 to 2026.

The core idea is straightforward. The treaty governs how the two countries divide the Ganga’s flow at Farakka during the lean season, that is, the dry months from 1 January to 31 May each year, when water is scarce and the stakes are highest. The sharing is done on a 10-day period basis, so the allocation adjusts as the actual flow changes through the season.

Instead of fixing a single rigid number, the treaty uses a tiered formula linked to how much water is actually available at Farakka. According to the treaty’s provisions, the arrangement works in three slabs:

If the flow is 70,000 cusecs or less: The water is split equally, 50:50, between India and Bangladesh.

If the flow is between 70,000 and 75,000 cusecs: Bangladesh is guaranteed a fixed 35,000 cusecs, and India receives the remaining balance.

If the flow is 75,000 cusecs or more: India receives 40,000 cusecs, and the excess flow goes to Bangladesh.

This formula is built on historical data. The allocation schedule is derived from the average flow at Farakka recorded over the 40 years between 1949 and 1988. The logic was to use a long-term average so that the formula would reflect the river’s typical behaviour rather than a single unusual year. There is also a special provision ensuring that during the most critical stretch, from 11 March to 10 May, India and Bangladesh each receive a guaranteed 35,000 cusecs in alternating 10-day periods.

The emergency and safeguard clauses

The treaty recognises that a river is unpredictable and that flows can fall dangerously low. Article II contains an emergency clause: if the flow at Farakka drops below 50,000 cusecs in any 10-day period, both governments must enter into immediate consultations to make emergency adjustments. Importantly, these consultations are to follow the principles of equity, fair play, and no harm to either party.

There is also a fail-safe mechanism and a commitment by India, as the upper riparian, to make every effort to protect the flows at Farakka in line with the 40-year average availability. However, one point worth noting is that, unlike the 1977 agreement, the 1996 Treaty does not contain a strong minimum “guarantee clause.” When flows fall short, the treaty relies on diplomatic consultation rather than an automatic guaranteed quantity. This design choice has been a recurring source of debate.

The Joint Committee for monitoring

A treaty is only as good as its enforcement. To monitor implementation, the treaty established a Joint Committee with equal representation from both countries. Its job is technical and continuous: it observes and records the daily flows of water at the Farakka feeder canal and at the Hardinge Bridge in Bangladesh, and it submits annual reports to both governments.

The Joint Committee works under the broader umbrella of the Joint Rivers Commission. If disputes arise that the committee cannot settle, the matter is escalated to the JRC, and ultimately resolved through diplomatic negotiation between the two governments. The treaty is also built to be reviewed: it provides for a review every five years, or earlier if either side requests one, which allows the arrangement to adapt as circumstances change.

Why the treaty mattered

The 1996 Treaty was widely seen as a diplomatic achievement. After decades of disputes and a long stretch with no agreement at all, it gave both countries a stable, predictable, long-term framework. For Bangladesh, it secured a defined share of dry-season water that is critical for irrigation, drinking water, navigation, and protecting the ecology of its delta. For India, it preserved the ability to divert water at Farakka to keep Kolkata Port functional and to support uses in West Bengal and Bihar.

More broadly, the treaty became a cornerstone of India-Bangladesh relations and a reference point for cooperation on the many other rivers the two countries share. India and Bangladesh have 54 transboundary rivers in common, and the success of the Ganga arrangement encouraged dialogue on others, including later understandings on rivers like the Kushiyara.

The criticisms and ongoing disputes

No water treaty is free of friction, and this one has faced sustained criticism, particularly from Bangladesh. A central complaint is that the formula relies on flow data from 1949 to 1988, a period that does not reflect today’s reality. The river’s behaviour has changed, and the formula does not account for climate change, shifting rainfall patterns, or upstream developments that have occurred since.

Critics in Bangladesh also point out that the treaty focuses narrowly on the volume of water at a single location, Farakka, rather than on the health of the river system as a whole. There are concerns that reduced flows contribute to salinity intrusion, riverbank erosion, and ecological stress in the Sundarbans delta. Studies have found that Bangladesh frequently did not receive its expected share during the most critical dry periods, partly because the absence of a firm guarantee clause leaves it exposed when flows are low.

The disagreements are not only international. Within India, the West Bengal government has raised concerns that it was not adequately consulted on a treaty that directly affects the state, and has flagged issues around erosion and dredging along the Ganga. This reflects a recurring theme in Indian federalism: water is a sensitive subject where the interests of the central government and the concerned state do not always align.

The road to 2026 and renewal

The treaty is set to expire in December 2026, and there is no automatic extension. Under its terms, any continuation requires fresh mutual consent between the two governments. As that deadline approaches, both countries have begun technical-level discussions on renewal, and the question of whether to renegotiate a more equitable, climate-resilient arrangement is firmly on the table. Bangladesh has signalled that it wants any new deal to address the shortcomings of the 1996 formula, while India weighs its own downstream commitments and the interests of West Bengal.

The renewal also tests the resilience of the bilateral relationship during a period of political change in Bangladesh. Water cooperation, in other words, is never purely about hydrology. It is tied up with trust, domestic politics, and the broader state of relations between two neighbours.

What the Ganga Treaty teaches about shared rivers

The Ganga Treaty is a useful case study in how transboundary water disputes can be managed. It shows that a formula-based approach, rather than a single fixed figure, can accommodate a river’s natural variability. It demonstrates the value of permanent institutional mechanisms like the Joint Committee and the JRC for continuous monitoring and dialogue. And it underlines the principle that cooperation, even imperfect cooperation, is usually better than the conflict and uncertainty that preceded it.

At the same time, its criticisms are just as instructive. They reveal the limits of an agreement that treats water as a fixed historical quantity in an era of climate change, and the difficulty of balancing the competing needs of an upstream and a downstream nation. As the 2026 renewal approaches, these lessons will shape whatever comes next.

What do you think? Should a renewed Ganga Treaty move away from a fixed historical formula towards one that accounts for climate change and the ecological health of the whole river system? And how should India balance the interests of a downstream neighbour like Bangladesh with the demands of its own states, such as West Bengal, when sharing a river that belongs to both?

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Table of Contents

Why the Ganga became a point of conflict 🔗

The early attempts at a solution 🔗

What the 1996 Ganga Treaty actually says 🔗

The water-sharing formula 🔗

The emergency and safeguard clauses 🔗

The Joint Committee for monitoring 🔗

Why the treaty mattered 🔗

The criticisms and ongoing disputes 🔗

The road to 2026 and renewal 🔗

What the Ganga Treaty teaches about shared rivers 🔗