Water problem in Tamilnadu and Karnataka can be solved with the following ways:-
Flats should be constructed during winter months only;
Flats should be constructed with adequate place for trees and plants like banana tree, mango tree and other trees;
Flats and independent houses should keep a close watch on wastage of water particularly when people go on tour the taps should be closed without any leakages;
In Kalyana Mandapams, people should not waste any water;
The number of invitees for any function should be restricted to say 100
During the summar months of March April May people should conserve water by not wasting water;
The Government could come out with water tankers and supply the water to the people;
The wells ponds, the rivers etc. should be cleaned by removing the sand or mud;
The Government should take preventive methods to solve the water problem rather than confrontation/conflict with two state Governments;
Since India is a monsoon region and so we can hope that there will not be a water problem permanently. Lots of rain during monsoon months is expected.
Other things you the reader know more towards solution. With the co-operation of the people of Tamilnadu and Karnataka we could have solutions.