The key is releasing waters during summer. KA release 205 tmc, out of which mostly were on rainy season Tamil nadu could not use that much water and mostly ends up in the sea. In fact that has caused lot of damages to the crops. [ you might guess why can't TN store those waters ? but limitage of Dam storage restricts that ].
so the key in the tribunal's award is sharing-of-water during needy times. I think it is much better. TN is not getting more water than before, but it can get more water during summer and can plan better than before.