While Karnataka has told the Supreme Court that it can't release Cauvery water to Tamil Nadu till December due to shortage, here is a look at the timeline of the whole issue:
1892 and 1924: Two agreements in place to share water
1974: Agreement comes to an end. Karnataka constructs dams and increases irrigation area
1970 to 1980: Fact finding committee comes into force. Finds that Tamil Nadu irrigated an area of 1,440,000 acres to 2,580,000 acres. Committee finds Karanataka irrigated 680,000 acres. This leads to Tamil Nadu demanding an increase in water share.
1990: Both states move Supreme Court following which direction issued to Centre to constitute the Cauvery Water Dispute Tribunal (CWDT).
1991: CWDT passes interim order directing Karnataka to release 205 TMCft of water to Tamil Nadu every year. Karnataka witnesses severe riots in which several persons are killed.
1995: Tamil Nadu goes to Supreme Court. Court tells TN to approach tribunal and also asks PM Narasimha Rao to intervene. PM orders release of 6 tmcft of water to TN. Karnataka says interim order flawed and was ambiguous on distress sharing.
1998: Cauvery River Water Authority Constituted to ensure implementation of CWDT order.
2002: Cauvery River water authority directs release of 0.8 tmcft of water to TN. Karnataka defies it, gets pulled up by Supreme Court, following which order is followed by then CM, S M Krishna.
2005: Karnataka refuses to implement the distress sharing formula and cuts out Cauvery water to Tamil Nadu. Six rounds of talks held and farmers from both sides try and come up with a solution.
2007: CWDT passes final order. Says out of 740 tmcft water, TN to get 419 tmcft, Karnataka 270 tmcft, 30 tmcft to Kerala and 7 tmc ft to Puducherry. Both Karnataka and Tamil Nadu go to Supreme Court to review tribunal's order.
2012: Karnataka directed by Prime Minister, Manmohan Singh to release 9,000 cusecs of water to TN. Karnataka and TN oppose it terming it as unacceptable. Supreme Court slams Karnataka for not following PM's order.
2013: The final award of the CWDT notified by the centre. Tamil Nadu moves Supreme Court seeking setting up of the Cauvery Management Board. Also seeks Rs 2,480 crore in damages from Karnataka for not following tribunal's orders.
Sept 5, 2016: Supreme Court orders release of 15,000 cusecs of water to TN for ten days. Protests erupt in Karnataka.
Sept 12, 2016: Karnataka seeks to modify order. Supreme Court orders release of 12,000 cusecs of water. Protests turn violent.
Sept 19, 2016: Union water resources secretary chairs the first meeting of the supervisory committee orders Karnataka to release 3,000 cusecs of water.
Sept 20, 2016: Both states go to Supreme Court which orders release of 6,000 cusecs of water for seven days.
Sept 23, 2016: Karnataka legislature passes resolution stating water will be released only for drinking purposes. TN files contempt plea in Supreme Court against Karnataka.
Sept 27, 2016: Karnataka to go to Supreme Court to seek modification of its Sept 20 order. Stage set for confontration between Karnataka and Supreme Court.