Section 31(1)(a) in The Faridabad Complex Water-Supply Bye-laws
(a)In every Public building ware-house and industrial building, separate storage tank shall be provided for storage of water required for domestic purposes. The capacity of the tank shall be worked out at the rate of at least 25 litre per occupant. In case of commercial building separate storage tank for storage of water required for domestic purposes shall be provided of the capacity referred to in sub-clause (a), if so required by the Chief Administrator.