Goa’s argument through the hearings, centred around the fact that diversion of water by Karnataka would disturb the ecological balance and also harm Goa’s ecosystem. Goa is a coastal State and overexploitation of fresh ground water would result in the increase of salinity in the groundwater as there would be ingression of salt water that would also damage the mangroves. Goa also contended that it was a water-deficient State and any diversion would adversely affect its water supply and agriculture. Karnataka argued that the Mhadei is a surplus basin and the surplus water drains into the sea, and proposed that this surplus water could be diverted to the Malaprabha basin that is a deficit basin to meet the drinking, irrigation, agriculture and power generation needs.