I am staying at Ranchi, the capital of Jharkhand, in a building comprising of 34 flats. I would like to know the minimum storage capacity of overhead water tanks. Please give the details of calculation.

Note: - There is no underground water tank. The overhead tanks are to be fed through deep well boring and used to service all the needs of the residents.

Sanjay Verma, Ranchi.
akshits64@yahoo.co.in