Beyond Disputes: Can the Tungabhadra Model Solve India's Water Wars?
An examination of the Tungabhadra water-sharing arrangement, its current challenges, and its potential lessons for resolving India's protracted inter-state river disputes.
The Pre-requisite: Understanding India's Water Governance Framework
To comprehend the significance of the Tungabhadra arrangement, one must first understand the complex legal and institutional landscape governing India's rivers. Water is a constitutionally mandated state subject, but the Union government has a crucial role in regulating inter-state rivers, creating a delicate federal balance.
(1) KEY TERMS
- Inter-State River Water Dispute (ISRWD): A disagreement between two or more state governments over the use, distribution, or control of the waters of an inter-state river or river valley.
- TMC ft (Thousand Million Cubic feet): A standard unit for water volume in reservoirs and river flows. One tmc ft is equivalent to approximately 28.3 billion litres.
- River Basin: The entire geographical area drained by a river and its tributaries. Experts advocate for managing water resources at the basin level rather than by political boundaries.
- Riparian State: A state through which a river flows, which is considered to have rights to the water in its territory.
(2) BACKGROUND & TIMELINE
The legal framework for water sharing is rooted in the Constitution of India. Entry 17 of the State List grants states legislative power over 'water supplies, irrigation and canals', subject to the Union List. Conversely, Entry 56 of the Union List empowers the Union government to regulate inter-state rivers if Parliament declares it to be in the public interest. To address disputes arising from this jurisdiction, Article 262 of the Constitution allows Parliament to legislate for the adjudication of ISRWDs and to bar the jurisdiction of courts, including the Supreme Court. Consequently, Parliament enacted the Inter-State River Water Disputes (ISRWD) Act in 1956, which provides for establishing ad-hoc tribunals to adjudicate disputes. The Tungabhadra project, a joint venture of the erstwhile states of Madras and Hyderabad, predates this framework, with construction beginning in 1949 and completed in 1953. Following the States Reorganisation Act of 1956, its management passed to Mysore (now Karnataka) and Andhra Pradesh, with Telangana becoming a stakeholder after its formation in 2014.
(3) INSTITUTIONAL FRAMEWORK
- Ministry of Jal Shakti: The nodal Union ministry responsible for water resources policy, planning, and development in India. It facilitates inter-state cooperation and implements national water schemes.
- Tungabhadra Board: A statutory body established under Section 66(4) of the Andhra State Act, 1953. It is responsible for the operation and maintenance of the Tungabhadra project and for regulating water releases to the beneficiary states—Karnataka, Andhra Pradesh, and Telangana—based on a pre-agreed formula.
- Central Water Commission (CWC): A premier technical organisation attached to the Ministry of Jal Shakti. It provides technical guidance, data, and advisory services to state governments on water management and dam safety.
The joint appearance of the Chief Ministers of Karnataka, Andhra Pradesh, and Telangana at the Tungabhadra dam on June 25, 2026, has renewed focus on an arrangement often cited as a rare example of functional inter-state water cooperation. While most major rivers are mired in decades-long legal battles, the Tungabhadra project has been managed with relative stability. This analysis deconstructs the 'Tungabhadra model', examines its current strains, and evaluates its broader applicability.
The Model: An Institutional Approach to Water Sharing
The Tungabhadra project's success lies in its institutional design, which separates the technical regulation of water from day-to-day politics. The cornerstone is the Tungabhadra Board, comprising representatives from member states and the Union government, tasked with the impartial implementation of a pre-determined water-sharing formula. This formula allocates water for irrigating a total of 16.4 lakh acres, with Karnataka receiving water for 9.26 lakh acres, Andhra Pradesh for 6.25 lakh acres, and Telangana for 87,000 acres (Source: The Hindu). This quantified, rule-based system, overseen by a dedicated technical body, has prevented the political escalations common in the Cauvery or Krishna disputes, where allocations are often contested seasonally in courts.
Emerging Fault Lines: Siltation and Upstream Development
Despite its success, the arrangement faces two significant challenges. The first is severe siltation. Over seven decades, the dam's gross storage capacity has shrunk by over 20%, from 133 tmc ft to approximately 106 tmc ft (Source: The Hindu). This reduction directly impacts water availability, especially in lean years, creating friction as states compete for a smaller resource pool. The second challenge is Karnataka's Upper Bhadra Project, a major lift irrigation scheme on the Bhadra river upstream of the main dam. Andhra Pradesh and Telangana fear it will reduce inflows into the Tungabhadra reservoir, affecting their share. The project received a provision of ₹5,300 crore in the Union Budget for 2023-24, and though not classified as a national project, it remains a major point of contention that the Board's current mandate cannot resolve.
Government Intervention: Infrastructure and Rehabilitation
The Union and state governments are addressing the dam's infrastructural and sustainability issues. Following the collapse of a crest gate during heavy inflows in August 2024, all 33 spillway gates were replaced. The new high-grade steel gates, installed at a cost of ₹51 crore, have an expected lifespan of 60 years, securing the dam's structural integrity (Source: The Hindu). At the inauguration on June 25, 2026, Union Jal Shakti Minister C.R. Patil acknowledged the siltation problem and assured the states of a central plan to desilt reservoirs nationwide. The Minister also emphasized expediting projects under the Dam Rehabilitation and Improvement Project (DRIP), a World Bank-assisted scheme framed by the Dam Safety Act, 2021.
A Contrast to Conflict: The Tungabhadra vs. Cauvery and Krishna
The Tungabhadra model stands in stark contrast to India's more intractable water disputes. The Cauvery dispute between Karnataka and Tamil Nadu has seen decades of litigation, tribunal awards (1991, 2007), a Supreme Court verdict (2018), and the formation of the Cauvery Water Management Authority (CWMA), yet disagreements over monthly releases persist. Similarly, the Krishna river dispute has been adjudicated by two tribunals—the Bachawat Tribunal (1976) and the Brijesh Kumar Tribunal (report submitted in December 2010)—but allocations remain contested. The key difference is the Tungabhadra Board's consistent, day-to-day regulation based on an accepted formula, whereas in other cases, every new project or lean season can trigger fresh political conflict and litigation.
Conclusion: A Fragile Model in a Changing Climate
Why this matters now: The Tungabhadra model is under renewed focus for two reasons. First, the recent high-level political meeting signals a commitment to preserving a cooperative framework when most inter-state relations are fraught. Second, as climate change intensifies monsoon variability, pressures on all water-sharing agreements are mounting. The dam's structural upgrade and the political dialogue around siltation and upstream projects make this a pivotal moment for the basin and a test case for cooperative federalism.
Likely trajectory: The model's resilience will be tested on two fronts in the next five years. The primary challenge is resolving the dispute over Karnataka's Upper Bhadra Project; a failure to negotiate could escalate the issue to a tribunal, undermining the cooperative spirit. The second is the implementation of the Union's promised desilting plan. The success of this technical intervention is crucial for augmenting the available water pool. Progress on these fronts will be shaped by the Dam Rehabilitation and Improvement Project (DRIP) Phase II and III, scheduled to run until 2027.
Governance implications: The Tungabhadra story offers a powerful lesson: institutional mechanisms are more durable than ad-hoc political deals. The existence of a permanent, technical body like the Tungabhadra Board has been central to its relative success, proving that disputes need not descend into perpetual conflict. The model, however, is not a panacea. It is effective at implementing an existing agreement but ill-equipped to handle new upstream developments that alter its fundamental assumptions. The future challenge is to evolve such institutions into dynamic river basin organisations that can manage entire ecosystems, adapt to climate change, and mediate new developmental claims before they become intractable legal battles.