Verdict is only a recommendation.Karnataka will file a review petition and the final judgement will take about one year time.Even then, it doesnt become Law, it has to be legitimised as Law by passing the bill in parliament.
TN or anybody cannot enforce to release the water as per the verdict, Karnataka can say, I will not be able to release water citing whatever reasons they want...
In the meantime, we can definitely convince the courts of the reality and get the justice. Assuming that, Courts go wrong again, we can always protest and stop the verdict becoming a Law.
As long it is an Unimplmentable solution, Nobody can force us to release water.
The only solution will be TN's acceptance to Karnataka's Proposal. My dear kannadigas we need not worry about Tamils, We just need to protest strongly , legally , Thats it.