Section 54(4) in Tamil Nadu Combined Development and Building Rules, 2019
(4)Separation of bath and wash basin water and reuse. - All buildings shall be provided with separate pipelines; one for collecting waste water from bath and wash basins and the other for connecting the toilets. The waste water from the toilets alone shall be connected to the street sewer. The waste water from the bath and wash basins shall be disposed off as here under. -Each building shall have a separate downward pipeline to collect waste water from bath and wash basins and the collected waste water shall be treated adequately by organic or mechanical recycling and taken to a sump for onward pumping to the exclusive overhead tank or to a separate compartment of over head tank for exclusive use of toilet flushing through cisterns. The excess waste water not reused for toilet flushing, shall be used for gardening or rain water harvesting structure within the site.Explanation. - For the purposes of these rules in regard to recycling systems are concerned, any other modifications, additional structures, alternative designs furnished by the applicant can be considered for approval, if it conforms to recycling concept to the satisfaction of the competent authority 'for building approval.The above stated waste water reuse arrangement is mandatory for High Rise buildings; optional and preferable for non- High Rise buildings.
