Kerala has blamed Tamil Nadu for unprecedented floods that claimed more than 400 lives and damaged property worth thousands of crores of rupees, saying it was caused by sudden release of water from Mullaperiyar dam. In an affidavit filed in the Supreme Court, Kerala Chief Secretary Tom Jose said the state was managing the spate of water by controlling spill and letting a major portion of the flood waters to escape to the sea by implementing a strict operational control over the spill of the two largest reservoir systems of Idukki and Idamalayar in synchronisation with eight small other reservoir systems in the Periyar basin.