"Nobody should have any doubts in this regard (about any injustice)," Siddarmaiah told the Legislative Assembly, as he assured members that government would present appropriate facts on the project before the visiting team of the tribunal.
The tribunal, constituted under the Inter-State Water Disputes Act 1956, is expected to give its final verdict by the end of 2015.
Water Resources Minister M B Patil said a delegation will be taken to New Delhi to press the state's case, if needed, since there will be concerted efforts by all stakeholders - Karnataka, Goa and Maharashtra.
The team will tour the area from December 12 to December 24, he added.
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Opposition JDS Leader H D Kumaraswamy said government should get the required environmental and forest clearances for taking up Kalasa-Banduri dam as the central and state governments are ruled by the Congress.
BJP Floor leader and former Chief Minister Jagadish Shettar pressed for all party leaders' meeting to discuss the pros and cons of the issue. "The meeting should discuss ways and means to wage a legal battle so that the tribunal gives verdict in our favour," he said.
The Kalasa-Banduri Nala (diversion) project, which will utilise 7.56 tmcft of water from the inter-State Mahadayi river, is being undertaken by Karnataka to improve drinking water supply to the twin cities of Hubli-Dharwad and the districts of Belgaum and Gadag.
It involves building barrages across Kalasa and Banduri, tributaries of Mahadayi river, to divert 7.56 TMC of water to the Malaprabha river which supplies the drinking water needs of the twin cities.