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State of Tamil Nadu v. State of Kerala

Original Suit · Neutral citation not assigned (Original Suit No. 3 of 2006)Decided 7 May 2014
Original Suit No. 3 of 2006
Chief Justice R.M. Lodha · Justice H.L. Dattu · Justice C.K. Prasad · Justice Madan B. Lokur · Justice M.Y. Eqbal

Background

Tamil Nadu operated the Mullaperiyar dam in Kerala under longstanding agreements and sought to raise its water level from 136 to 142 feet as permitted by a 2006 Supreme Court judgment. Kerala subsequently enacted legislation treating the dam as endangered and restricting the level. Tamil Nadu challenged that legislation and sought protection for its water and repair rights.

Decision Breakdown

The Court decreed Tamil Nadu's suit and declared the 2006 Kerala amendment unconstitutional in its application to the Mullaperiyar dam. Kerala could not legislatively overturn the Court's binding factual determination about dam safety, and fresh expert investigations confirmed no material change justifying reopening that determination. Kerala was permanently restrained from obstructing restoration to 142 feet or the authorized repair work. A three-member committee, chaired by a Central Water Commission representative with one member from each State, would supervise restoration, inspect safety and issue binding emergency directions. A replacement dam required agreement between both States; the connected special-leave petition was dismissed.

Lesson Learnt

The judgment protected Tamil Nadu's specified water and maintenance rights while requiring continued safety supervision for communities around the dam. A State's safety concerns did not authorize legislation reversing a final judicial finding on the same dispute.

Official source (sci.gov.in)View Judgment (PDF)

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