How did the Indus Waters Treaty (1960) affect water distribution and relations between Pakistan and India?

Understanding the question

Explain the river allocation, then assess its effect on cooperation and conflict.

Thesis

The Treaty made water rights more predictable, but its durability depends on compliance, reliable information and stronger water management within Pakistan.

Outline

1. Partition and the need for a settlement
2. Eastern and western river allocations
3. Development gains and dispute procedures
4. Cooperation despite political conflict
5. Upstream risks and domestic weaknesses
6. Critical assessment and policy priorities

Introduction

Partition divided an irrigation system that had developed as a single network. Pakistan depended on water passing through territory controlled by India, while both countries needed clear rules for development. The Indus Waters Treaty of 1960 provided those rules after negotiations supported by the World Bank. Its main achievement was to make water rights more predictable. It did not remove mistrust or turn the basin into a jointly managed resource.

How the settlement distributed water

River allocation created legal certainty

The Treaty allocated the eastern rivers, Ravi, Beas and Sutlej, mainly to India, and the western rivers, Indus, Jhelum and Chenab, mainly to Pakistan. This was a division by river group, subject to specified uses and conditions. It should not be described as an equal division of all river water.

India retained defined uses on the western rivers, including domestic use, specified agriculture and hydropower within treaty conditions. Therefore, an Indian project is not automatically unlawful because it lies on a western river. Its design and operation must be assessed against the relevant provisions.

Replacement works made the settlement usable

Pakistan needed to replace supplies previously drawn from the eastern rivers. Reservoirs, barrages and link canals helped move western-river water towards affected areas. The settlement therefore combined legal rights with physical adaptation. A right on paper would have offered limited protection without the infrastructure needed to use it.

Case in point: Mangla and the wider Indus Basin replacement works helped Pakistan reorganise irrigation around the new allocation. This illustrates how engineering supported a diplomatic agreement.

What the Treaty changed in bilateral relations

Technical contact survived wider hostility

The Permanent Indus Commission provided a standing channel for information exchange and discussion. Over much of its history, this channel continued despite wars and diplomatic crises. It reduced the need to negotiate water arrangements from the beginning whenever political relations deteriorated.

This was practical cooperation rather than political reconciliation. Both states could benefit from following a limited agreement while continuing to disagree on Kashmir, security and other issues.

Disputes acquired a legal route

Article IX provides different procedures for questions, technical differences and legal disputes. The Commission, a Neutral Expert and a Court of Arbitration perform different roles under the Treaty. These are not simply interchangeable stages of an ordinary court appeal.

The World Bank has specified procedural responsibilities, including certain appointments. It does not control the rivers, enforce every decision or guarantee Pakistan's water supply.

Case in point: The Kishenganga proceedings show that disputes about hydropower can be tested through treaty rules. They also show that a legal process can manage disagreement without removing its political causes.

Why vulnerability remains

Timing matters as well as annual volume

Agriculture and hydropower depend on when water arrives. Upstream operating decisions, project designs and weaknesses in information exchange can therefore create concern even without a permanent diversion of all downstream water. Each allegation still needs evidence about actual flows, seasonal conditions and operating capability.

It is misleading to assume that an announcement alone enables India to stop all western-river water immediately. Legal position, physical capability and measured effects are separate questions.

Climate risks exceed the original bargain

Changing snow and glacier conditions, irregular rainfall, floods and droughts increase uncertainty. The Treaty provides an allocation framework, but not a complete system for shared climate adaptation, groundwater protection, water quality or delta health.

Domestic weaknesses increase external exposure

Poor maintenance, inefficient irrigation, groundwater depletion and unsuitable crop incentives weaken Pakistan's resilience. Some canal seepage also recharges groundwater, so every conveyance loss should not be treated as an equal net loss to the basin. The useful measure is reliable water service and productivity, not simply kilometres of canals lined.

Critical assessment

The Treaty was more successful at defining rights than at creating trust. Its long survival remains important, but survival must not be confused with uninterrupted compliance. Its present difficulties also show that legal rights need diplomatic effort, credible evidence and institutions capable of responding to disruption.

Policy priorities

• Defend treaty rights: Use the appropriate legal procedures and distinguish arbitral findings from government claims.
• Improve predictability: Seek timely project information, flood warnings and workable technical contact.
• Build domestic resilience: Strengthen river telemetry, groundwater management and transparent provincial allocation.
• Raise water productivity: Support suitable crops, better irrigation services and protection for vulnerable users.

Conclusion

The Treaty converted a dangerous inheritance of Partition into a defined water-sharing arrangement. It supported development and limited cooperation, but could not resolve the wider political conflict. Pakistan's strongest approach combines defence of its legal rights with better information, practical diplomacy and responsible use of its own water.

Revision note: developments after the 2025 paper

India announced that it was holding the Treaty in abeyance in April 2025; Pakistan rejected that position. On 31 August 2026, the Court of Arbitration issued an award finding that the Treaty remained in force. A legal finding does not, by itself, establish that practical cooperation or compliance has resumed. These later developments are revision material, not facts available on the examination date.

References

• World Bank: Treaty allocation, institutions and the Bank's procedural role.
• Indus Waters Treaty, 1960, Articles II, III, VIII, IX and XII, with the relevant annexures.
• Permanent Court of Arbitration: press release on the 31 August 2026 award.
• Pakistan Affairs Mastery Pack, Chapter 35 and the water-security practice answer.