For sixty-four years, the Indus Waters Treaty survived everything the subcontinent could throw at it–three wars, nuclear brinkmanship, terrorist attacks, diplomatic ruptures that shattered every other institutional bridge between New Delhi and Islamabad. It was, as the textbooks liked to say, the gold standard of transboundary water governance: proof that even nuclear-armed enemies could recognise the existential logic of cooperation over a shared river. That proof is now being demolished, one tunnel bore and one sluice gate at a time. India’s decision to advance two major hydraulic infrastructure projects on the Chenab River – while simultaneously placing the Indus Waters Treaty in formal abeyance – is not a technical dispute about sediment management or inter-basin hydrology. And in one of the world’s most volatile nuclear corridors, calculated strategic acts have consequences that outlast the governments that authorise them.
Water has rarely been declared a weapon in formal diplomatic language.
The immediate trigger is, on its face, engineering. The first project is the Chenab-Beas Link Tunnel, a Rs 2,352 crore undertaking in Himachal Pradesh’s Lahaul-Spiti district: an 8.7-kilometre bore designed to siphon water from the Chenab basin into the Beas river system. The second is the restoration of sediment management infrastructure at the Salal Dam. Together, they represent nearly Rs 2,600 crores of investment in hydraulic architecture at precisely the moment New Delhi has told Islamabad – and the world – that it no longer considers itself bound by the treaty’s institutional mechanisms. Do not mistake the timing for coincidence. India’s initiation of large-scale hydrological infrastructure projects on the Chenab River while unilaterally holding the Indus Waters Treaty in abeyance reflects a dangerous politicisation of transboundary water governance that threatens regional stability, agricultural sustainability, and the food security of millions in Pakistan. The Chenab is no ordinary river. It is one of three western tributaries – alongside the Jhelum and the Indus itself – allocated exclusively to Pakistan under the 1960 agreement brokered by the World Bank. For decades, the treaty held because both sides understood something elemental: water is not a bargaining chip when the alternative is thirst. That understanding is now being stress-tested by infrastructure that answers to no treaty, no tribunal, and no downstream neighbour. The Chenab-Beas Link Tunnel and the restoration of sediment management at Salal Dam collectively indicate a strategic attempt to enhance India’s capacity to manipulate downstream river flows, undermining the treaty’s legal framework and eroding confidence in rules-based international water cooperation. The significance of sediment management should not be lost on general readers. When a dam can be emptied and refilled strategically – when sluice gates can be operated to flush or withhold flows at will – its operator acquires not merely a reservoir but a valve. A valve that sits upstream of the largest contiguous irrigation network on the planet.
The Indus Basin Irrigation System is among the largest in human history, sustaining an agrarian economy upon which tens of millions of livelihoods, vast food production zones, and the rural social fabric of an entire nation depend. When hydrologists and water ministers in Islamabad speak of the western rivers, they are not speaking the language of infrastructure. They are speaking the language of survival. This is why the withholding of data is not a bureaucratic slight. It is a weapon. India’s refusal to provide critical hydrological data to Pakistan, despite escalating climate vulnerabilities and international concerns, represents a serious breach of cooperative riparian obligations and exposes millions of downstream populations to agricultural and humanitarian crises. In an era defined by Himalayan glacial retreat, erratic monsoon cycles, and cascading hydrological shocks, downstream states cannot plan, adapt, or protect their populations without real-time river data from upstream. That data – flow rates, reservoir levels, diversion volumes – is not merely technical. It is life-critical intelligence. To withhold it is to govern by manufactured uncertainty; to weaponise ignorance itself. The climate dimension amplifies everything. As glaciers that feed the Chenab and its sister rivers thin and fragment, the seasonal hydrology of the entire Indus system is becoming less predictable, not more. The rational response is deeper cooperation, more data-sharing, and expanded institutional frameworks. India is moving in precisely the opposite direction.
There is a word for what is happening on the Chenab, and it is not engineering. It is coercion – conducted at a hydraulic scale, in a region where miscalculation carries nuclear consequences. By advancing inter-basin diversion infrastructure on rivers legally allocated to Pakistan, New Delhi is not merely exploiting a legal grey zone. It is rewriting the informal rules of a geopolitical neighbourhood that can ill afford to lose them. By pursuing inter-basin diversion projects on western rivers allocated to Pakistan under the Indus Waters Treaty, India is normalising unilateral hydro-political behaviour that destabilises one of the world’s most sensitive nuclear regions and weakens international treaty credibility. There is a certain brazenness to doing this openly – announcing infrastructure projects with budget line items and parliamentary approvals while simultaneously announcing treaty suspension. It suggests confidence: a belief that no institution, no court, no coalition of states will extract a meaningful price. So far, that confidence appears justified. And that is perhaps the most alarming aspect of this entire affair. Water has rarely been declared a weapon in formal diplomatic language. But the history of the twenty-first century is already littered with examples of upstream states using flow control to extract concessions, punish adversaries, and assert dominance without ever firing a shot. The Chenab is becoming another chapter in that history. The ongoing expansion of Indian hydraulic control infrastructure over the Chenab basin raises profound concerns regarding the strategic weaponisation of water resources, particularly against a downstream state whose economy, irrigation systems, and food supply are dependent on the Indus. The language of weaponisation requires precision. India has not, at the time of writing, deliberately flooded Pakistani territory or engineered a drought. What it has done is construct the architecture of future leverage – infrastructure that, once operational, gives New Delhi options it did not previously possess. In geopolitics, options are power. Irreversible infrastructure options, acquired during treaty suspension, are something more: they are facts on the ground.
Diplomats are careful people. They prefer the phrase “suspension” to “violation”. They speak of “technical reviews” when they mean strategic reorientation. But the pattern visible on the Chenab requires plain language. India’s decision to operationalise major Chenab projects amid treaty suspension demonstrates a pattern of coercive hydro-diplomacy that disregards international legal commitments, intensifies regional mistrust, and heightens ecological insecurity across South Asia. The word “pattern” is load-bearing here. A single infrastructure project, however provocative, might be explained as a domestic necessity. A sediment management restoration, taken alone, might be characterised as routine dam maintenance. But when infrastructure expansion, data withholding, treaty suspension, and formal abeyance notification converge simultaneously – in the weeks following a political rupture – the pattern speaks for itself. (To be Concluded)
The writer is a freelance columnist.