Section 14(2)(b) in The Chennai Metropolitan Area Groundwater (Regulation) Act, 1987
(b)on or after the commencement of the Chennai Metropolitan Area Groundwater (Regulation) Amendment Act, 2002 (Tamil Nadu Act 37 of 2002), every person who constructs a building, whether for residential or non-residential purpose, shall provide rainwater harvesting structures in such manner as may be prescribed;