If there is no issue with dam then what is the issue with Kerala?..The state is ready to give water to TN , even after a new Dam is built.So this defies the very base of the your argument. And don't think the water in periyar is flowing waste to Arabian sea.It can be used for power geenration in Idukki, and should only be a great relief to a state which is facing acute power crisis. But apart from all this factors the Kerala Govt. stance so far is that , there is no issue for them to give water to TN, but the Dam's safety is the primary issue.. Imagine the dam getting collapsed and the districts of kerala getting immersed in water and districts in madurai going back to the stage in 1800's ..it will be a disaste to both the states.So better act wise than clinging oneself to petty politics