Hope you understand the implications before saying anything: a. Hogenakal is not entirely their area. Some of it belongs to karnataka and if a dam is built, water will fill our space. b. It is lot easy to increase the capability of mettur to serve the purpose. Why can't they do it? c. Big reservoir in a low lying area, will increase the water flow, drying up our Canals (need rework of the canals with increased slope)
Before saying any thing on Karnataka, please think about it!