The dispute, when it began in July 1980, was confined to the Malaprabha command area.
Called the Naragund rebellion, the area's farmers revolted against the then chief minister R Gundu Rao's decision to collect a betterment levy without providing water from the Mahadayi.
Another story is that Yoga Nandeeshwara performed penance here, and so it was named after him.
Nandi is also commonly called Nandidurga (Fort) because of the fort built here by the ruler Tippu Sultan.
Cauvery is one of them because in 2017, Nagaraj protested against comments made by Sathyaraj, a Tamil film actor, during a Cauvery agitation spearheaded by the Tamil Nadu Actors’ Association.
On February 16 this year, the Supreme Court tweaked the 2007 verdict of the Cauvery Water Disputes Tribunal (set up in 1990) and increased Karnataka's share at Tamil Nadu’s expense.
Tamil Nadu's principal Opposition party, the Dravida Munnetra Kazhagam, called a on April 6 to protest a Supreme Court ruling on Cauvery and the Centre’s 'inability' to work for an amicable resolution despite being directed by the apex court to seek one.
Soon after the BJP formed a government in Goa in 2017, the party president, Amit Shah, asked Parrikar and Karnataka CM candidate B S Yeddyurappa to 'settle' the matter.
Parrikar did not meet Yeddyurappa but in deference to Shah's directive he wrote a missive in which he stated that Goa was willing to release the Mahadayi water as long as it was used only for drinking in the drought-prone areas and not for irrigation.
Goa was irked by Karnataka’s move to design and construct dams, canals and barrages that would route the Mahadayi waters to the Malaprabha basin and water the parched districts of Bagalkot, Gadag, Dharwad and Belgaum in 'Bombay' Karnataka, bordering Maharashtra, to the north-west.
Goa's contentions were that its population was dependent on the river’s natural course, diversion would impair the fragile ecosystem and deprive the state of the quantum of required water.
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One of the issues is a perennial one, involving the distribution of the waters from the rivers flowing through Karnataka and its neighbours.