The 1924 water sharing agreement between then Madras Presidency and Princely State of Mysore (now Tamil Nadu and Karnataka) lapses after expiration of its term of 50 years.

1986: Tamil Nadu approaches the centre for setting up a tribunal for disputes arising out of Cauvery water sharing.

2 June 1990: A Cauvery Water Disputes Tribunal (CWDT), headed by justice Chittatosh Mookerjee, set up under the centre after the Supreme Court’s direction.

25 June 1991: CWDT passes an interim award asking Karnataka to release 205 tmcft of water to Tamil Nadu every year. It also directed Karnataka not to increase its irrigated land area from the existing 1,120,000 acres (around 4,500 km).

As a result, there was widespread dissatisfaction and violence in the two states.

11 December 1991: CWDT’s interim award notified by thecentre after the Supreme Court struck down an ordinance issued by Karnataka and upheld the award.

August 1998: The Cauvery River Authority (CRA) constituted by the centre for the implementation of the interim award of the CWDT.

September 2002: The CRA directs Karnataka to release 9,000 cusecs per day of Cauvery water to Tamil Nadu. The body was presided over by then prime minister Atal Bihari Vajpayee

5 February 2007: CWDT passes the final award and allotted 30 tmc to Kerala, 270 tmc to Karnataka, 419 tmc to Tamil Nadu and 7 tmc to Puducherry. Additionally, 14 tmc was reserved for environmental “inevitable escapages" into the sea.

19 February 2013: The centre notifies the final award of the CWDT, on the direction of the Supreme Court.

19 March 2013: Tamil Nadu moves the