Indus Waters Treaty Climate Change Debate: Dr P.K. Saxena vs Syed Mehar Ali Shah Exposes Dangerous Legal Blind Spot

The Indus Waters Treaty climate change debate has finally produced what was long overdue: a technically precise, publicly accessible exchange between two senior officials who know the treaty’s text better than almost anyone alive — and whose arguments, read together, inadvertently reveal the most dangerous blind spot in the entire dispute.

Dr P.K. Saxena, former Indian Commissioner for Indus Waters, published a two-part indictment of the treaty in May 2026. Syed Mehar Ali Shah, Pakistan’s serving Commissioner, replied in Dawn on June 16. The exchange is the most technically precise public debate on the Indus since the treaty was signed.

It is also, ultimately, a debate between two officials looking backwards — at a river system that no longer exists as it did in 1960.

1. The Most Technically Precise IWT Debate in Decades 

The Indus Waters Treaty climate change debate generated by the Dr P.K. Saxena-Syed Mehar Ali Shah exchange is genuinely significant — not primarily for what either man argues, but for what the exchange as a whole reveals.

Both Dr P.K. Saxena and Syed Mehar Ali Shah are exceptional practitioners of the law as it was written in 1960. Both present their arguments with impressive technical precision. Both can cite chapter, article and annexure with authority.

And both are, ultimately, engaged in a debate about a legal settlement governing a natural system that has been physically transformed since that settlement was made.

The Dr P.K. Saxena article — a two-part indictment now circulating through Indian embassies worldwide — represents India’s most comprehensive public articulation of its historical grievances. Syed Mehar Ali Shah’s rebuttal — published in Dawn — is the most legally precise Pakistani response to that argument in recent public record.

Reading them together is instructive precisely because they illuminate not only the points of legal dispute but the shared blind spot that neither official, however technically accomplished, has yet found a way to address.

Read the Indus Waters Treaty’s original text at the World Bank official IWT archive

2. What India Argued: Dr P.K. Saxena’s Case for “Abeyance Is the Only Option” 

Dr P.K. Saxena’s argument in the Indus Waters Treaty climate change debate rests on a single, blunt thesis: India negotiated in good faith and paid for it for 65 years.

His case has several interlocking elements:

The historical grievance: Pakistan delayed acceptance of the 1954 World Bank proposal by four years, developing new uses on the western rivers throughout, and ultimately received 80% of the system’s water — while India wrote a cheque for £62 million to finance the infrastructure making Pakistan’s allocation work.

The operational grievance: Every major Indian hydropower project on the western rivers — Baglihar, Kishenganga, Pakal Dul, Tulbul — has faced prolonged Pakistani challenge. Pakistan, Dr P.K. Saxena alleges, privately acknowledged the flood-moderation benefits of these projects while publicly blocking them, then packaged the obstruction as a water war narrative and marketed it internationally against a state that had not committed a single treaty violation in 65 years.

The conclusion: A treaty cannot hold when one party bears all the obligations and the other collects all the benefits. Abeyance, Dr P.K. Saxena argues, is not the wrong decision at the wrong time. It is the only decision the arithmetic permits.

The argument is powerful in presentation. Syed Mehar Ali Shah’s response identifies precisely where its logic breaks down.

3. What Pakistan Argued: Syed Mehar Ali Shah’s Five Legal Corrections

Syed Mehar Ali Shah’s rebuttal in the Indus Waters Treaty climate change debate applies one correction five times: Dr P.K. Saxena starts with known facts and draws the wrong conclusion.

The rebuttal is sharply legal and methodically structured:

On the 80-20 split: Real fact, false inference. Pakistan does not control the western rivers before they enter its territory. The IWT exists because in April 1948, India stopped the taps to Pakistan at a critical agricultural moment. Pakistan’s 80% is not a gift — it is a protected entitlement against the precise threat Dr P.K. Saxena’s abeyance position now revives.

On Pakistan’s four-year delay: Due diligence, not obstruction. Pakistan was abandoning historical dependence on the eastern rivers and needed to verify that the western rivers could physically carry the load. A paper allocation that left canals dry would not have been a settlement.

On India’s financial contribution: Not charity. It was the price India paid to gain unrestricted use of the eastern rivers, while Pakistan bore the cost of rebuilding an entire irrigation system from scratch.

On design restrictions: The most direct answer. Upstream states can manipulate downstream flows; downstream states cannot return the favour. Restrictions on pondage, spillways and storage are not punishments. They are what makes a downstream entitlement physically real.

On obstruction: The August 2025 Award on General Issues and the May 2026 Supplemental Award on Pondage settle the point — treaty constraints come first. A project is not lawful because it suits India. It must conform to what India signed.

India’s 17 Projects and Hydro-Hegemony: Dar’s Brussels Warning

4. The 80-20 Split: Real Fact, False Conclusion

The Indus Waters Treaty climate change debate turns, in part, on whether the 80-20 water allocation split represents injustice or equity.

Dr P.K. Saxena presents the split as evidence of India’s extraordinary generosity: no other upper riparian has surrendered the larger share of a river system and then paid the downstream state to use it.

Syed Mehar Ali Shah’s correction is precise. The 80% Pakistan receives from the western rivers is not a gift from India. India does not give Pakistan the western rivers. Pakistan receives what flows to it from rivers that rise in territory controlled by India — and the Treaty’s purpose was to replace Indian upstream discretion with a legally binding obligation to let those flows continue.

The April 1948 episode — when India briefly stopped water supplies to Pakistan at a critical agricultural moment — is the historical fact that makes this distinction concrete. The IWT was designed to ensure that event could never be repeated through legal means. Dr P.K. Saxena’s abeyance position, Syed Mehar Ali Shah argues, is precisely a revival of the upstream discretion the IWT was designed to eliminate.

5. The Weaponisation Charge Reversed: Chenab Flow Data That Cannot Be Ignored

The most operationally significant section of Syed Mehar Ali Shah’s rebuttal in the Indus Waters Treaty climate change debate concerns specific, documented Chenab River flow data that transforms the weaponisation debate from allegation to evidence.

Syed Mehar Ali Shah cites specific flow readings at Marala — a key measurement point on the Chenab:

Date/Period	Chenab Flow at Marala	Context
Normal high	78,276 cusecs	Pre-reduction baseline
May 2025 drop	1,527 cusecs	No rainfall explanation
December 2025	870 cusecs	Further reduction
May 2026 event	Drop from 21,887 to 5,689 cusecs	Single event window

These are not allegations. They are flow measurements — the kind of hydrological data that both countries have treaty obligations to share, and that Pakistan has documented and communicated to India in writing each time the drops occurred.

India subsequently announced the diversion of Chenab into Beas — the Chenab-Beas Link Project, already identified by Pakistan as a grave treaty violation.

The conclusion Syed Mehar Ali Shah draws is unavoidable: Pakistan’s fear of water weaponisation is no longer hypothetical. It is documented, measured and communicated — and responded to with further diversion announcements.

Explore the Permanent Court of Arbitration’s Indus Waters proceedings at the PCA official site

6. The Court Has Spoken: PCA Awards Since 2023 Back Pakistan’s Legal Case 

The Indus Waters Treaty climate change debate has a legal dimension that extends beyond the two officials’ published arguments — the Permanent Court of Arbitration has been actively ruling on specific disputes throughout 2023-2026.

The court’s findings have consistently reinforced Pakistan’s legal positions:

• The August 2025 Award on General Issues confirmed that treaty constraints come first — a project is not lawful simply because India desires it; it must conform to treaty limits
• The May 2026 Supplemental Award on Pondage directly addressed the Ratle and Kishenganga disputes, finding that India cannot justify increased pondage through imagined capacity, artificial assumptions or bare assertions
• The June 2025 Supplemental Award of Competence confirmed that India cannot unilaterally hold the treaty in abeyance

Syed Mehar Ali Shah’s assessment of the rebuttal’s standing is therefore backed by more than legal argument — it is backed by binding international adjudication.

Winning the legal argument, however, as the analysis acknowledges, does not automatically win the political argument. The political battle is now moving in international capitals — from Brussels conferences to UN Security Council chambers.

7. Indus Waters Treaty Climate Change: The Word That Doesn’t Appear in the Treaty

Here is where the Indus Waters Treaty climate change debate reaches its most fundamental — and most neglected — dimension.

The word “climate” does not appear anywhere in the 1960 Indus Waters Treaty.

This is not a minor drafting oversight. It reflects the reality that in 1960, the concept of anthropogenic climate change and its hydrological consequences was not a framework within which water treaties were designed. The treaty was written to govern the distribution of a relatively stable, historically predictable river system — one whose flows were shaped by monsoons, snowmelt and Himalayan hydrology operating within known parameters.

Those parameters have since changed fundamentally. And the treaty contains no mechanism for adapting to those changes.

Both Dr P.K. Saxena and Syed Mehar Ali Shah are exceptional practitioners of the law as it was written in 1960. That is precisely the problem. They are defending or dismantling a legal framework designed for an ecological reality that no longer exists.

8. A Quarter of Himalayan Ice Gone: The Physical Reality Behind the Legal Debate 

The Indus Waters Treaty climate change debate takes place against a physical backdrop that dwarfs both officials’ legal arguments in consequence.

The upper Indus Basin has already lost roughly a quarter of its perennial ice cover. The Himalayan, Karakoram and Hindu Kush glaciers that feed the Indus river system — providing critical dry-season flows through meltwater — are retreating at accelerating rates.

The consequences for the river system that the treaty governs are profound:

• Flow patterns are becoming more extreme — higher peaks during melt season, lower troughs during dry periods
• Monsoon cycles are disrupted — the seasonal reliability that the treaty’s allocation mechanisms assumed is eroding
• Glacial lake outburst floods (GLOFs) are occurring with increasing frequency — releasing billions of cubic metres within hours, in ways that no treaty’s data-sharing provisions were designed to anticipate
• Sediment loads are changing — affecting dam operations, pondage calculations and river morphology in ways that the 1960 treaty’s technical annexures do not address

The upper Indus Basin is running hotter, faster and less predictably. The IWT was designed for a different river. The question is whether either party can recognise this before climate change forces the recognition on them.

9. What Both Officials Should Be Talking About: Three Overdue Conversations 

The Indus Waters Treaty climate change debate that Dr P.K. Saxena and Syed Mehar Ali Shah have conducted with such legal precision needs to expand to encompass three conversations that are long overdue:

9.1 Resuscitating the Permanent Indus Commission With Real-Time Data

The Permanent Indus Commission — established under the treaty to provide a standing forum for technical exchange — currently operates on paper data exchanges that are too slow for the modern hydrological reality.

A single glacial outburst flood moves billions of cubic metres within hours. No paper exchange can keep pace with that. The Commission needs real-time satellite and sensor data integration — the kind of capacity being developed through SUPARCO’s Space4Climate platform and the UN-SPIDER network — to make early warning and rapid response possible.

9.2 Recognising That 1960 Design Constraints Were Built for a Different Himalaya

The treaty’s technical annexures — which govern dam design, pondage limits, spillway specifications and storage constraints — were calibrated to a Himalayan watershed that has since lost a quarter of its ice cover. Those constraints need climate-adjusted technical review, not because they were wrong in 1960 but because the physical system they were designed to govern has changed.

9.3 Accepting Shared Liability for Basin-Wide Ecological Stress

Delta depletion, groundwater exhaustion and sediment loss are accumulating across the Indus basin as shared ecological liabilities — not bilateral grievances. The Indus Delta in Sindh is disappearing. Groundwater tables across the Punjab plains of both countries are falling. These are consequences of the entire basin’s management, and they cannot be addressed by either country alone.

Space Technology Disaster Management Pakistan: UNOOSA Conference 2026

10. Climate Change as the Third Commissioner: The Party That Honours No Awards

The Indus Waters Treaty climate change debate ultimately circles back to one inescapable reality: the most consequential party in the Indus dispute is not India, and it is not Pakistan.

It is climate change.

Climate change attends no meetings. It files no objections. It is not bound by the Vienna Convention on the Law of Treaties. It does not participate in PCA proceedings and does not honour arbitral awards.

It is, however, already rewriting the treaty — altering the flows, the ice cover, the monsoon patterns and the sediment loads that the 1960 settlement assumed would remain stable.

The Indus Basin is a shared ecological system on which the food security of roughly 300 million people on both sides of the border depends. It is under physical stress that no treaty revision, no arbitral award and no abeyance declaration can address unilaterally.

Syed Mehar Ali Shah wins the legal debate. Pakistan’s legal arguments — backed by multiple PCA awards — are more coherent and better grounded than Dr P.K. Saxena’s historical grievance case.

But winning the legal debate is not the same as solving the problem. The problem — the Indus Waters Treaty climate change challenge — is not primarily a legal problem. It is an ecological one, playing out in a political arena that has not yet found the language, let alone the mechanisms, to address it.

11. Conclusion: The Indus Waters Treaty Climate Change Debate Must Evolve or Become Irrelevant

The Indus Waters Treaty climate change debate generated by Dr P.K. Saxena and Syed Mehar Ali Shah is the most technically precise public exchange on the Indus in decades. Both men have contributed genuinely to public understanding of the treaty’s legal architecture, its historical negotiation and its contemporary dispute.

But the debate’s most important contribution may be inadvertent: by demonstrating the extraordinary technical precision with which two accomplished officials can argue about a 1960 settlement governing a river system that has been physically transformed, it highlights how urgently the debate needs to change.

The IWT is not merely under political stress. It is under ecological stress that neither party’s legal arguments can address. The upper Indus Basin is hotter, less ice-covered and less predictable than the treaty assumed. The delta is depleting. The groundwater is falling. The glacial lakes are filling.

Climate change is the third commissioner. The only question, as the analysis concludes, is whether the two parties will act before it finishes rewriting the treaty for them.

They should start — as the analysis recommends — with real-time data on the Commission, climate-adjusted technical annexures, and a recognition that the Indus is a shared ecological system in crisis, not merely a water allocation dispute between two nuclear-armed adversaries.

The rivers Dr P.K. Saxena and Syed Mehar Ali Shah are arguing over are not the rivers that existed in 1960. It is time the treaty they are defending or dismantling caught up with the rivers that actually exist.