SC Reopens Mullaperiyar Dam Debate, Issues Notice on Decommissioning Plea

New Delhi - The Supreme Court of India has once again stepped into the protracted and contentious dispute over the Mullaperiyar Dam, issuing notices to the Union Government and the State of Tamil Nadu on a fresh plea seeking its decommissioning. The petition, filed by the Kerala-based NGO 'Save Kerala Brigade', argues that the 130-year-old structure poses a grave threat to millions of lives and calls for the construction of a new dam.

A bench comprising Chief Justice of India (CJI) B.R. Gavai and Justice K. Vinod Chandran took up the matter on October 13, acknowledging the dam's significant age and the gravity of the concerns raised. The court's decision to issue notice signals a potential re-evaluation of the dam's structural integrity and the existing arrangements governing its operation, reigniting a decades-old interstate conflict rooted in issues of water rights, federalism, and public safety.

Arguments Before the Bench

Appearing for the petitioner, Senior Advocate V. Giri presented a stark argument, emphasizing the human cost at stake. "But the life of about 10 million people are at the risk of loss," he submitted, framing the issue as a matter of urgent public safety rather than a mere infrastructural debate. He contended that given the dam's age and location in a seismically active zone, its continued existence is a ticking time bomb for the population living downstream in Kerala.

CJI Gavai, acknowledging the dam as "one of the oldest in existence," initially floated alternative solutions. "Perhaps some direction could be issued to strengthen the dam or appoint an expert body to assess it," he remarked, suggesting a path of remediation rather than replacement.

However, Justice K. Vinod Chandran highlighted the core complexity of the dispute, which pits Kerala's safety concerns against Tamil Nadu's water security. He pressed the petitioner to articulate the specific problems with the existing dam, cautioning that a new structure would directly impact Tamil Nadu's water supply. "But you have to explain what exactly is the problem because if another dam is built then Tamil Nadu water...?" he queried.

In response, Giri asserted that constructing a new dam was the only viable long-term solution and that the Supreme Court was the sole authority capable of issuing such a far-reaching directive. Following these preliminary arguments, the bench proceeded to issue notice, seeking formal responses from the central and Tamil Nadu governments.

A Dam's Contentious History

The Mullaperiyar Dam, an engineering feat of the British era completed in 1895, is a legal and geographical anomaly. Located in the Idukki district of Kerala, it is owned, operated, and maintained by the government of Tamil Nadu under a 999-year lease agreement signed in 1886. The dam's reservoir is the primary source of irrigation and drinking water for five agricultural districts in Tamil Nadu, making it a lifeline for the state's agrarian economy.

For decades, Kerala has advocated for the dam's decommissioning, citing expert studies that point to its structural vulnerabilities. The state government has consistently argued that the dam, built with lime and surkhi mortar, cannot withstand a major earthquake, and a breach would lead to a catastrophic disaster.

Conversely, Tamil Nadu has vehemently maintained that the dam is structurally sound and has undertaken periodic strengthening measures. It has consistently sought to raise the reservoir's water level to its originally intended full capacity of 152 feet to maximize water storage for its farmers.

Previous Judicial Interventions and the Separation of Powers

The Supreme Court has adjudicated this dispute on multiple occasions. In a landmark 2006 judgment, the court permitted Tamil Nadu to raise the water level to 142 feet and carry out strengthening works, after which it could be raised to 152 feet.

In a swift countermove, Kerala passed the Kerala Irrigation and Water Conservation (Amendment) Act, 2006, which legislatively designated the Mullaperiyar dam as endangered and restricted its water level to 136 feet. This legislative action was subsequently challenged, and in 2014, the Supreme Court struck down the amendment. The court held that the Kerala legislature had overstepped its bounds by enacting a law to nullify a judicial verdict, thereby violating the fundamental constitutional principle of separation of powers.

The 2014 ruling reaffirmed the dam's safety and allowed the water level to be maintained at 142 feet. It also established a three-member Supervisory Committee to oversee the dam's safety and maintenance, a mechanism intended to balance the competing interests of the two states.

Legal Implications and Future Trajectory

The current petition brings the focus squarely back on the dam's age and the evolving understanding of seismic risks and dam safety protocols. The petitioners are likely to argue that circumstances have materially changed since the 2014 verdict, citing recent seismic activities and the increasing frequency of extreme weather events, such as the devastating Kerala floods of 2018.

Legal experts will be closely watching how the court navigates its own precedent. While the 2014 judgment declared the dam safe based on the evidence presented at the time, a PIL focused on the fundamental right to life under Article 21 of the Constitution could compel a fresh, comprehensive assessment. The court will have to weigh the principle of res judicata against its constitutional duty to protect citizens from imminent threats.

The bench's initial remarks suggest a cautious approach. CJI Gavai's suggestion of appointing a new expert body indicates a desire for updated, impartial technical data before making any definitive pronouncements. The court's decision will have significant implications for not only the residents of Kerala and Tamil Nadu but also for the jurisprudence surrounding aging infrastructure and interstate resource sharing in India. The case serves as a critical test of the judiciary's role in mediating complex techno-legal disputes that have profound human, economic, and political consequences.