Water withdrawing from water tank

If you know who steals water from your water tankl, you talk to him or issue a legal notioce, failing to listen or refrain from doing so, you can take legal action against him by lodging a complaint with the police or local civic body or file a suit for injunction against him.

File complaint in Municipal authority of your zone against suspected water thief. 

@ T. Kalaiselvan, Advocate @ R.K Nanda, 

Sir, first of all thanks for giving your precious time, to my post,  I can't say anything wrong to the owners having roof right even after knowing water has been taken by them not by neighbours, before starting legal course through Civic body, police or court, first I want to ensure whether I have a right to have a water tank on roof or not when no roof right has been given through sale deed. Seller (lady) had full ownership of building later sold lower 3 floors and 4th & 5th floors are holding by her next generation with roof right. Rgds

In a apartment complex like this, even though the land owner has terrace rights she cannot refuse to install overhead water tank on the terrace because it comes under basic amenities.

As a matter of fact the terrace is supposed to be a common area insofar as installation of overhead water tank to the other floor owners.