The Mullaperiyar Dam issue has been lingering the Kerala & Tamil Nadu politics for many long years. This dam was constructed during 1886-1895 using old time construction materials – rubble masonry in lime surkhi mortar as shell of the upstream
and downstream side filled with lime surkhi concrete as inner core. Later, in an effort to strengthen the Dam, a concrete shield of 10 metre thickness was added to the downstream side of the old dam during1980.