The Indus Waters Treaty of 1960 stands as one of the most carefully negotiated and legally resilient transboundary water agreements in international law.
Concluded between Pakistan and India with the World Bank’s good offices, it was designed to insulate water from political conflict by anchoring it in law, engineering discipline and neutral dispute resolution. A binding international instrument governed by pacta sunt servanda, the Treaty has endured wars and prolonged crises, reflecting its legal clarity and durability. Today, however, it faces an unprecedented challenge arising not from interpretive ambiguity but from India’s unilateral conduct and rejection of treaty-mandated adjudication.
At the core of the Treaty lies a permanent allocation of rivers. Article II vests the eastern rivers—Ravi, Beas and Sutlej—in India, while Article III grants Pakistan exclusive rights over the western rivers—Indus, Jhelum and Chenab. This was the Treaty’s foundational bargain. India’s use of the western rivers is permitted only within the narrow limits of Article III(2) and Annexure D, allowing restricted non-consumptive, run-of-the-river hydropower projects. Strict constraints on pondage, storage and flow control were imposed to protect Pakistan as the lower riparian and prevent water from becoming a strategic tool.
Pakistan’s objections to India’s hydropower projects, particularly Kishanganga and Ratle, arise squarely from these constraints. Pakistan has consistently maintained that excessive pondage, gated spillways, drawdown flushing mechanisms and specific intake and outlet configurations violate Annexure D, paragraphs 8 to 15. These provisions strictly circumscribe permissible pondage and expressly prohibit designs that enable manipulation of flows beyond instantaneous power generation. The concern is not theoretical. Technical assessments demonstrate that such features can materially affect downstream flows, particularly during lean seasons, undermining the guarantees embedded in Article III(1) of the Treaty.
The dispute took a more serious turn in April 2025 when, following a terrorist incident in Pahalgam, India announced that it was placing the Indus Waters Treaty “in abeyance.” This declaration has no basis in the Treaty or in international law. The Treaty contains no suspension or termination clause and Article XII permits modification only by mutual agreement, affirming its permanent character. Under Article 26 of the Vienna Convention on the Law of Treaties, reflecting customary international law, treaties in force are binding and must be performed in good faith. Articles 60 and 62 allow suspension only in exceptional circumstances, none of which apply. Security incidents do not justify suspending obligations over essential shared water resources.
International jurisprudence has consistently rejected unilateral abandonment of treaties involving long-term resource management. In the Gabčíkovo–Nagymaros Project case, the International Court of Justice held that political necessity or alleged fundamental change of circumstances cannot justify unilateral withdrawal from treaty obligations. Against this settled legal background, India’s claim that the Indus Waters Treaty has been suspended is legally void and incapable of extinguishing either substantive obligations or procedural mechanisms.
Pakistan responded not through countermeasures or reciprocal suspension but by invoking the Treaty’s dispute-resolution framework under Article IX. This framework establishes a graduated mechanism culminating in arbitration under Annexure G for disputes of legal interpretation. In accordance with these provisions, a Court of Arbitration was duly constituted under the auspices of the Permanent Court of Arbitration at The Hague. India’s refusal to participate or recognize the tribunal does not deprive it of jurisdiction. Annexure G is explicit that once arbitration is validly triggered, jurisdiction vests in the tribunal and cannot be defeated by unilateral non-appearance.
Over the past year, the Court of Arbitration has repeatedly affirmed its jurisdiction, rejecting India’s objections. In its Award on Competence, the tribunal unanimously held that it was properly constituted and fully competent to adjudicate Pakistan’s claims. In a subsequent Supplemental Award in 2025, the tribunal expressly dismissed India’s plea that the Treaty had been placed in abeyance, holding that unilateral declarations have no legal effect, that the Treaty remains fully in force and that the Court retains jurisdiction notwithstanding India’s continued non-participation. These rulings reaffirm a fundamental principle of international adjudication: a party cannot escape legal obligations by denying the validity of agreed dispute-resolution mechanisms.
The tribunal further clarified that Annexure D must be interpreted restrictively, in the light of the Treaty’s object and purpose. It rejected expansive interpretations permitting increased storage or flow control based on operational convenience or projected energy demand. Compliance, the tribunal emphasized, is determined by substantive effect on downstream flows, not by formal design labels.
A critical development occurred in late January 2026 during the merits phase, when the Court issued a detailed procedural order directing India to submit comprehensive technical and operational data relating to the Kishanganga and Ratle/Baglihar projects. Acting under Annexure G, the tribunal required disclosure of daily inflows, outflows, storage levels and operational logs essential to assess compliance with Article III and Annexure D. Pakistan was directed to specify precise data categories, ensuring procedural fairness.
The deadline fixed by the Court for compliance is 9 February 2026. The order is legally binding. The tribunal has made clear that proceedings will continue regardless of India’s participation and that failure to produce data may result in adverse inferences, a well-established principle in international adjudication. If India fails to comply, the Court may proceed ex parte and ultimately issue a final award directing design or operational modifications. While tribunals lack coercive enforcement powers, their awards are binding and persistent defiance carries serious legal, diplomatic and reputational consequences.
Throughout the dispute, Pakistan has remained anchored in law, relying exclusively on Treaty mechanisms and neutral adjudication. What is at stake transcends a bilateral dam dispute. The credibility of international law governing shared natural resources hangs in the balance. As the February 2026 deadline approaches, the choice before India is clear: comply with the rule-based system it accepted or persist in defiance and face the consequences international law unmistakably prescribes.
—The writer is a renowned constitutional and international law expert with over 25 years of practice before the superior courts of Pakistan.
