Section 63(2) in Tamil Nadu Combined Development and Building Rules, 2019
(2)Additional regulations for all buildings. - (a) In the ground floor, floor level of water closets shall be at least 0.9 meter above the road level to ensure free flow.(b)All centrally air conditioned buildings shall have their own waste water reclamation plant and use reclaimed waste water for cooling purposes.(c)A separate sump shall be constructed for storing potable where the water is supplied by the Local Body and the volume of such sump shall not exceed 1,000 liters per dwelling unit. This sump shall be independent of other tanks, which may be constructed for storing water obtained from other sources.
