Ganga Water Treaty at 30: Why Bihar Must Be Heard in India–Bangladesh Water Diplomacy

Editorial|upscjournal

India–Bangladesh Ganga Water Treaty 1996–2026

The 1996 India–Bangladesh Ganga Water Sharing Treaty is approaching the end of its 30-year term in December 2026. What might otherwise have been a routine diplomatic renewal has become a much larger question: Can a water-sharing framework designed three decades ago remain adequate in an era of climate change, altered river flows, rising water demand and growing concerns of upstream Indian states such as Bihar?

The answer should not be a simple choice between renewing or rejecting the treaty. India and Bangladesh have an opportunity to redesign it for the next generation of transboundary water cooperation.

For India, this also raises an important federal question. Foreign treaties are negotiated by the Union government, but rivers do not follow administrative boundaries. Decisions taken at Farakka can have implications upstream in Bihar and downstream in West Bengal and Bangladesh. Significantly, a Parliamentary Committee on External Affairs has itself recommended continued consultation with Bihar and West Bengal while formulating India's negotiating position.

Why Is the Ganga Water Treaty in the News?

India and Bangladesh signed the Treaty on Sharing of Ganga/Ganges Waters at Farakka on 12 December 1996.

It governs sharing of Ganga water at Farakka Barrage in West Bengal during the lean season from 1 January to 31 May. Allocation is calculated in 10-day periods, rather than as a fixed annual share. The treaty established a Joint Committee for monitoring flows and implementation.

With its 30-year period ending in 2026, the future arrangement has acquired urgency. India has publicly stated that discussions concerning the treaty will take place through the existing bilateral mechanisms, including the Joint Rivers Commission (JRC) and associated technical structures.

At the same time, concerns have been raised in Bihar over whether the existing arrangement adequately reflects the state's contemporary requirements during the lean season.

This makes the issue simultaneously one of:

India–Bangladesh relations + water diplomacy + climate change + river ecology + Indian federalism + Bihar's developmental interests.

What Does the 1996 Treaty Actually Provide?

The treaty uses the amount of water available at Farakka to determine the share of each country.

Water available at Farakka	India's share	Bangladesh's share
70,000 cusecs or less	50%	50%
70,000–75,000 cusecs	Balance of flow	35,000 cusecs
75,000 cusecs or more	40,000 cusecs	Balance of flow

There is an additional safeguard under which India and Bangladesh are each assured 35,000 cusecs in alternating three 10-day periods between 11 March and 10 May.

Important Prelims Fact

The treaty is concerned primarily with lean-season sharing at Farakka, not division of the entire annual discharge of the Ganga.

Why Does Bihar Matter?

Bihar does not share an international boundary with Bangladesh, and Farakka Barrage itself is in West Bengal. Yet Bihar occupies a crucial position upstream of Farakka along the Ganga system.

That makes Bihar an important stakeholder in any discussion on the river's flow, sediment and ecological health.

1. Lean-season water availability

Water demand in Bihar is not confined to floods and monsoons.

During the dry months, Ganga water supports:

irrigation,
drinking-water requirements,
groundwater recharge,
ecological flows,
fisheries,
urban requirements, and
economic activities along the river.

A treaty dealing specifically with January-May flows therefore overlaps with Bihar's own period of greater water stress.

The central issue is not that all water released towards Bangladesh would otherwise remain available to Bihar—the hydrology is considerably more complex. Rather, Bihar has a legitimate interest in ensuring that future allocations are based on updated basin-wide flow and demand assessments.

2. Bihar's long-standing concern over sedimentation

One of Bihar's most persistent concerns regarding the lower Ganga has been silt accumulation and river morphology.

The Union Government has previously acknowledged concerns raised by the Bihar Government regarding flooding and siltation in the Ganga and the possible influence of the Farakka Barrage, and an independent study was undertaken with representation from Bihar.

This is important because water-sharing negotiations cannot be reduced merely to the number of cusecs crossing a particular point.

A river transports:

Water + sediment + nutrients + aquatic life + ecological services.

For an alluvial river like the Ganga, sediment management can influence channel depth, bank erosion, drainage congestion and flood behaviour.

3. Flood paradox: too much water and too little water

Bihar illustrates one of the central paradoxes of Indian water management:

The same region can suffer devastating floods during the monsoon and water stress during the dry season.

A modern Ganga framework should therefore link dry-season allocation with:

flood forecasting,
sediment management,
reservoir coordination,
groundwater recharge,
wetlands,
environmental flows, and
basin-wide hydrological information.

Water diplomacy in the 21st century must move from simply dividing water to jointly managing a river system.

Why Bangladesh's Concerns Cannot Be Ignored

An India-centric treaty that fails to recognise Bangladesh's legitimate needs would neither be sustainable nor strategically wise.

Bangladesh is the lower-riparian country. Freshwater from the Ganga-Padma system supports agriculture, fisheries, navigation and ecosystems.

Dry-season freshwater availability also has wider ecological implications in the deltaic region.

India and Bangladesh share 54 transboundary rivers, making water management a permanent component of bilateral relations rather than a single diplomatic negotiation. The Joint Rivers Commission, established in 1972, remains the principal bilateral mechanism for cooperation over these shared waters.

A dependable water arrangement therefore contributes to something much larger than irrigation—it creates strategic trust between two neighbours.

Why Simply Extending the 1996 Formula May Be Inadequate

The 1996 treaty was a major diplomatic achievement. Its continuation for three decades itself demonstrates the value of institutionalised cooperation.

But circumstances have changed substantially.

1. Climate change

Changing rainfall patterns, extreme precipitation, drought and temperature increases are altering South Asian hydrology.

Historical averages may consequently become less reliable predictors of future flows.

The Parliamentary Committee on External Affairs has specifically recommended that renewal should be guided by updated hydrological data and climate-change projections.

2. Rising population and water demand

Domestic, agricultural, industrial and urban water requirements have increased considerably since the 1990s.

A future arrangement must therefore assess not only the international division of water but also changing demand across the basin.

3. River ecology

A river cannot be managed merely as a pipeline carrying divisible quantities of water.

Minimum ecological flows are important for:

aquatic biodiversity,
fisheries,
sediment transport,
water quality,
wetlands and
delta sustainability.

4. The old framework is largely Farakka-centric

The fundamental question should evolve from:

“How much water should each country receive at Farakka?”

to:

“How can India and Bangladesh sustainably manage the entire connected river system?”

That is the difference between water allocation and river-basin management.

Federalism and Foreign Policy: Why States Must Have a Voice

Under the Constitution, international relations and treaties primarily fall within the Union domain.

Yet water is also deeply linked with states.

This produces a distinctive challenge: an international agreement negotiated in New Delhi can have significant consequences for farmers and communities hundreds of kilometres upstream.

The Parliamentary Committee has consequently emphasised consultation with West Bengal and Bihar so that state and national interests are aligned during negotiations.

This offers a useful model of cooperative federalism in foreign policy.

States should not exercise an automatic veto over India's diplomacy. Equally, they should not be treated merely as implementing agencies after an agreement has already been negotiated.

A better approach is:

State consultation → Scientific assessment → National position → International negotiation

This can strengthen rather than weaken India's negotiating credibility.

Bihar's Interests Should Not Become “Bihar vs Bangladesh”

This distinction is critical.

Presenting the issue as a competition between Bihar's farmers and Bangladesh's citizens would oversimplify the challenge.

The real problem is scarcity and variability across an interconnected river basin.

Bihar's concerns should therefore be converted into scientifically measurable negotiating parameters, including:

lean-season water requirements,
ecological-flow requirements,
irrigation demand,
drinking-water demand,
sediment dynamics,
groundwater conditions,
navigation requirements, and
climate projections.

That provides a much stronger basis for negotiations than political assertions alone.

What Should the Next Ganga Water Framework Look Like?

1. Use updated hydrological data

The successor framework should not depend primarily on historical flow assumptions.

India and Bangladesh should develop a joint, transparent and regularly updated hydrological database.

2. Introduce climate-responsive allocation

Instead of a rigid formula for decades, the treaty could contain adaptive mechanisms that respond to unusually dry or wet years.

Periodic scientific review could become an integral part of the arrangement.

3. Move towards basin-level management

Negotiations should cover more than Farakka.

Possible areas include:

river morphology,
sedimentation,
pollution,
groundwater,
wetlands,
floods and droughts,
environmental flows,
river navigation and
ecosystem restoration.

The Parliamentary Committee has similarly argued that bilateral cooperation should move beyond dry-season sharing to include areas such as aquifer recharge, river rejuvenation and technical collaboration.

4. Create a stronger joint scientific mechanism

The Joint Rivers Commission should be supported by a permanent scientific platform involving:

hydrologists + climate scientists + river geomorphologists + ecologists + engineers + representatives of affected governments.

Real-time data-sharing can reduce disagreements over facts before they become diplomatic disputes.

5. Institutionalise participation of Bihar and West Bengal

Both states should have structured channels to provide technical inputs to India's negotiating team.

The purpose should be consultation—not fragmentation of India's foreign policy.

6. Protect Bangladesh's downstream requirements

A sustainable Indian negotiating strategy must recognise the principle that downstream communities also have legitimate requirements.

India's credibility as a regional power will depend partly on its ability to reconcile national interests with responsible riparian behaviour.

7. Integrate disaster cooperation

India and Bangladesh already cooperate on hydrological information and flood-related issues.

A renewed framework can expand:

real-time flood forecasting → extreme rainfall alerts → drought monitoring → coordinated disaster response.

This could transform a politically sensitive treaty into a broader platform for climate-security cooperation.

Strategic Importance for India

Bangladesh is central to India's Neighbourhood First policy, the connectivity of the Northeast, BIMSTEC cooperation and the Bay of Bengal region.

Water disputes have the potential to create distrust disproportionate to their economic size.

Conversely, successful river diplomacy can create long-term political capital.

For India, therefore, the objective should not be to “win” a larger share of water.

The strategic objective should be:

A predictable, equitable and climate-resilient river regime that protects India's legitimate requirements while ensuring a stable relationship with Bangladesh.

That is more valuable than short-term bargaining.

The Larger Lesson: Rivers Demand Cooperation Beyond Borders

The Ganga begins far from Bangladesh and passes through several political jurisdictions before entering the neighbouring country.

But ecologically, it remains a single river system.

Political borders can divide sovereignty; they cannot divide hydrology.

The approaching end of the 1996 treaty therefore provides India and Bangladesh with an opportunity to move from the diplomacy of water division to the diplomacy of shared river management.

Bihar should have a meaningful voice because its agriculture, ecology and communities are deeply connected with the Ganga. Bangladesh's downstream interests must similarly be respected.

A successful successor arrangement would combine:

equity + science + federal consultation + ecological sustainability + climate resilience + diplomacy.

If India and Bangladesh achieve that balance, the 2026 negotiations could become a model for managing transboundary rivers across South Asia.

★ Why Is This Important for UPSC/State PCS?

UPSC Prelims

Ganga Water Sharing Treaty, 1996
Farakka Barrage
India-Bangladesh shared rivers
Joint Rivers Commission
Ganga-Padma river system
Teesta River

GS Paper II

India and its neighbourhood
India-Bangladesh relations
Cooperative federalism
Role of states in foreign-policy-related issues
International agreements

GS Paper III

Water-resource management
Climate change
Disaster management
River ecology

Geography

Ganga basin
Transboundary rivers
Floods and sedimentation
River morphology

Bihar State PCS

Very high relevance due to the Ganga's role in Bihar's agriculture, floods, sedimentation, water security and economic geography.

UPSC Previous Year Questions

PYQ 1 — UPSC Prelims 2017

With reference to river Teesta, consider the following statements:

The source of river Teesta is the same as that of Brahmaputra but it flows through Sikkim.
River Rangeet originates in Sikkim and it is a tributary of river Teesta.
River Teesta flows into Bay of Bengal on the border of India and Bangladesh.

Answer: 2 only

This PYQ shows UPSC's interest in India-Bangladesh transboundary river geography.

PYQ 2 — UPSC Mains 2018

“Analyse internal security threats and transborder crimes along Myanmar, Bangladesh and Pakistan borders including Line of Control (LoC). Also discuss the role played by various security forces in this regard.”

Although focused on border security, it demonstrates the wider importance of Bangladesh in India's neighbourhood and bilateral-policy questions.

UPSC/State PCS MCQs

Q1. With reference to the India-Bangladesh Ganga Water Sharing Treaty, consider the following statements:

It was signed in 1996.
It governs lean-season water sharing at Farakka.
Water is shared on the basis of 10-day periods.
Farakka Barrage is situated in Bihar.

Which of the statements given above are correct?

(a) 1 and 2 only
(b) 1, 2 and 3 only
(c) 2, 3 and 4 only
(d) 1, 2, 3 and 4

Answer: (b)

Explanation: Farakka Barrage is located in West Bengal, not Bihar.

Q2. The Joint Rivers Commission (JRC), frequently seen in India-Bangladesh relations, primarily deals with:

(a) Maritime boundary delimitation
(b) Management and cooperation regarding shared rivers
(c) Cross-border electricity trading
(d) Management of the India-Bangladesh land boundary

Answer: (b)

Explanation: The India-Bangladesh Joint Rivers Commission was established in 1972 as the key institutional mechanism for cooperation over shared water resources.

Mains Practice Question

“The renewal of the India-Bangladesh Ganga Water Treaty should move beyond water allocation at Farakka towards climate-resilient and basin-based river management.” Discuss. Also examine why consultation with Bihar and West Bengal is important for India's negotiating position.

15 Marks | 250 Words

Frequently Asked Questions

When was the Ganga Water Sharing Treaty signed?

It was signed between India and Bangladesh on 12 December 1996.

Where is the water shared?

The treaty governs water sharing at Farakka in West Bengal.

During which months does the treaty operate?

The sharing formula applies during the lean season from 1 January to 31 May.

When does the treaty complete its 30-year term?

It completes its 30-year period in December 2026.

Why is Bihar concerned?

Bihar has interests connected with lean-season water availability, irrigation, drinking water, sedimentation, river morphology, floods and the ecological health of the Ganga.

Does Bihar negotiate directly with Bangladesh?

No. International negotiations are undertaken by the Government of India, although consultation with affected states can inform India's national negotiating position.

What is the Joint Rivers Commission?

The India-Bangladesh Joint Rivers Commission, established in 1972, is the principal bilateral institutional mechanism for cooperation over common rivers.

Ganga Water Treaty 1996 Renewal: Bihar's Concerns, Farakka and India-Bangladesh Relations Explained