Fact 1 The british builder who buld the dam estimated a 50 year life to the dam.
Fact 2 This is a river which is originating in kerala & flowing through kerala. Dam is situated in kerala. The risk is for the people & villages in kerala.
Fact 3. If this dam breaks, all watre, trees rocks due to flood will reach idukki dam[biggets in asia], will it be able to hold this much water. Idukki dams spill-way can only open 2 TMC of water in 4 hours. When the 11 TMC water from mullaperiyar reach idukki, it will fail. Causing distruction to 30% kerala area.