Coercion does not necessarily arrive with soldiers and weapons in the grammar of interstate conflicts. More frequently, and with growing complexity, it comes through the more subdued machinery of sideways-bending institutions, infrastructure hastened during diplomatically delicate times, and legal manoeuvres intended to convey intent while maintaining the illusion of restraint. In South Asia, where two nuclear-armed states have spent seven decades managing the same rivers they spent the same period refusing to trust each other, water has become precisely this kind of instrument; a domain of pressure that is plausibly deniable, structurally consequential, and tuned to the frequencies of crisis. What had long been an analytical suspicion among South Asian security scholars became an empirical fact after India declared on April 23, 2025, that the Indus Waters Treaty of 1960 was to be held “in abeyance” in the wake of the Pahalgam attack: water had officially entered the coercive toolkit of sub-conventional conflict between India and Pakistan. This article makes the case that what we are seeing is a pattern rather than an exception, one that has critical ramifications for Pakistan’s long-term national resilience, water diplomacy, and strategic planning, and necessitates a new conceptual vocabulary to adequately define it.

To understand what is new about the current moment, one must first understand what Cold Start was designed to do, and why Water Start, as a parallel concept, is analytically necessary. India’s Cold Start doctrine, developed in the early 2000s following the Kargil conflict and the 2001 Parliament attack crisis, was a response to a specific strategic problem: how to conduct a punishing conventional military operation against Pakistan quickly enough to achieve meaningful objectives before the international community intervened to impose a ceasefire, while remaining calibrated enough not to cross Pakistan’s nuclear red lines. As Walter Ladwig’s foundational analysis in International Security established, Cold Start envisions Integrated Battle Groups conducting rapid, shallow thrusts into Pakistani territory, offensive enough to inflict costs, limited enough to deny Pakistan the justification for nuclear escalation. Its logic is the logic of calibrated pressure: impose real pain below the threshold of catastrophic response.

Water Start operates on identical logic but in a different domain. It refers to the intentional use of water-related instruments: treaty suspension or reinterpretation, acceleration of upstream infrastructure construction during crises, selective flow restriction or manipulation, denial of hydrological data, legal contestation through international mechanisms, and strategic narrative construction, as tools of coercive pressure and crisis signalling during sub-conventional conflicts. Like Cold Start, Water Start is designed to impose real costs on Pakistan while remaining below the threshold that would trigger a catastrophic or nuclear response. Like Cold Start, it exploits a structural asymmetry: just as India’s conventional military superiority creates the space for limited offensive action, India’s upstream riparian position on the western rivers creates the space for water coercion. And like Cold Start, it functions most powerfully not through its actual implementation but through the credible threat of implementation, the knowledge, on Pakistan’s side, that the instrument exists and has been used before.

Water Start is not possible without a prior structural condition: hydrohegemony. Zeitoun and Warner’s foundational framework in Water Policy defined hydro-hegemony as the capacity of an upstream riparian state to control transboundary water resources through a combination of geographic advantage, superior infrastructure capacity, greater international diplomatic standing, and narrative authority over how the river and its management are framed. All four requirements are met by India’s location in the Indus basin. The sources of the two rivers most significant to Pakistan’s western Punjab and Sindh, the Jhelum and Chenab, originate in or travel through Indian-administered territory before they cross the Line of Control. India has spent decades constructing hydropower infrastructure on these rivers, such as the Kishanganga project on the Jhelum tributary, the Ratle project on the Chenab, and several smaller run-of-river plants that collectively make up a sizable infrastructure with the potential to manipulate flow. The non-consumptive use clauses of the treaty provide for the individual defence of each of these initiatives. India is in charge of the........

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