Introduction
Signed in 1996 for a duration of thirty years, the Ganga Water Treaty between India and Bangladesh is set to expire in December 2026. While it historically helped manage dry-season allocations below the Farakka Barrage, shifting hydrological profiles, environmental degradations, and emerging regional geopolitics demand a comprehensive renegotiation rather than a straightforward extension.
Domestic Political Interests and Transboundary Geopolitics
Water sharing in South Asia is profoundly intertwined with domestic federalism and regional strategic competition, requiring careful diplomatic alignment.
- Federal Friction and State Grievances: In India's federal structure, riparian state interests significantly influence transboundary diplomacy. West Bengal has repeatedly highlighted severe riverbank erosion in Malda and Murshidabad along with deteriorating navigability at the Kolkata Port due to the Farakka Barrage. Meanwhile, upstream Bihar attributes severe seasonal flooding and aggravated siltation to the backwater effect of the barrage, demanding its comprehensive structural review.
- Neighborhood Diplomacy and Regional Balance: Managing ties with Bangladesh is central to India's 'Neighbourhood First' policy. The Union government must balance Dhaka's demand for enhanced dry-season discharge guarantees with domestic political sensitivities in border states, all while countering expanding third-party investments and strategic influence in regional water infrastructure.
Ecological Imperatives for Treaty Renegotiation
The ecological landscape of the Ganga basin has transformed drastically since the mid-1990s, exposing major gaps in the original agreement.
- Outdated Hydrological Baseline: The 1996 treaty relies on historical flow data gathered between 1949 and 1988 at Farakka. Climate change has since induced altered precipitation patterns, prolonged dry spells, and glacial retreat, making older hydrological baselines obsolete.
- Lack of Mandated Environmental Flows (E-flows): The existing pact focuses purely on volumetric apportionment between the two sovereign nations without reserving baseline ecological flows. Insufficient minimum discharge damages downstream aquatic biodiversity, threatens endangered species like the Gangetic dolphin, and accelerates salinity ingress in the Sundarbans delta.
- Sedimentation and Riverbed Aggradation: Heavy siltation at the Farakka Barrage has raised riverbed levels, reducing carrying capacity and increasing flood vulnerabilities. A modernised treaty requires joint sediment monitoring, dredging, and watershed-level soil conservation.
Conclusion
The 2026 renewal must transcend fixed volumetric partitioning by transitioning toward Integrated River Basin Management (IRBM). By institutionalising structured state-level consultations alongside bilateral scientific monitoring, India can effectively align domestic federal concerns with enduring transboundary hydro-diplomacy.