From the study of Indian Institute of Technology, Delhi , they says that Mullaperiyar Dam in unsafe situation. The Dam is located Kerala-Tamilnadu border. If the water level in this Dam exceeds a limit greater than 136 feet, it will seriously affect all the all the livings in Kerala, especially those the living on the riverbanks.
Please watch this video;
A long view of Mullaperiyar DAM sight.
A close snap of the Outer core of Mullaperiyar DAM