Present an account of the Indus Water Treaty and examine its ecological, economic and political implications in the context of changing bilateral relations.

The Indus Waters Treaty (IWT), 1960, brokered by the World Bank and signed by Nehru and Ayub Khan, partitioned the Indus system: the eastern rivers (Ravi, Beas, Sutlej, about 33 MAF) to India and the western rivers (Indus, Jhelum, Chenab, about 135 MAF) to Pakistan, with India permitted non-consumptive uses including run-of-the-river hydropower and limited storage. A Permanent Indus Commission handles routine matters, with disputes escalating to a Neutral Expert or a Court of Arbitration. The treaty survived the wars of 1965 and 1971 and Kargil; in April 2025, after the Pahalgam terror attack, India placed it in abeyance, its gravest crisis yet.

Ecological implications

• Sharply reduced flows in the eastern rivers have degraded riverine ecology downstream, while the Indus delta suffers seawater intrusion, salinity and mangrove loss.
• The treaty is silent on climate change, glacier retreat, groundwater and environmental flows, a structural gap as Himalayan hydrology shifts.

Economic implications

• Treaty-enabled canal development underwrote the green revolutions of both Punjabs and Pakistan's irrigation-dependent economy.
• Restrictive design conditions have slowed Jammu and Kashmir's hydropower development, with potential near 20,000 MW largely untapped; Kishenganga and Ratle faced years of arbitration.

Political implications

• Long celebrated as a model of water diplomacy between hostile neighbours, the treaty has become an instrument of leverage: India issued notices in 2023 and 2024 seeking its modification and review, and the 2025 abeyance explicitly links water cooperation to cross-border terrorism.
• Pakistan's overwhelming dependence on the Indus system for irrigation makes water an existential and therefore escalatory issue in bilateral relations.

Between abrogation and an ossified status quo, a renegotiated, climate-aware treaty with basin-level data sharing remains the rational path forward.