Problem comes only when not enough rain during on two monsoon. Morever lakhs or hectares depends on cavery water for farming.
More details please read this: http://www.tnau.ac.in/dr/zonepdf/CauveryDeltaZone.pdf
So bad monsoon this year ? Though there is no report of drought in any state in India like we saw last year and IPL was in danger because of water scarcity
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