Now getting into the controversial part, the catchment areas and river basin downstream includes five major districts of central Kerala -- Idukki, Ernakulum, Kottayam, Alapuzha and Trissur -- which has a total population of 3.5 million people.
In 1979, there were few minor earthquakes experienced in the regions surrounding the dam following which safety concerns were raised over the dam. Since then, both states Kerala and Tamil Nadu have been at loggerheads with each other on the issue.
A state agency had reported that the dam will not withstand an earthquake above magnitude 6 on the Richter scale.
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