Section 5(1)(a) in The Chennai Metropolitan Water Supply and Sewerage Act, 1978
(a)promoting or securing the planned development, efficient operation, maintenance and regulation of water supply and sewerage system in the [Chennai] [Substituted for the word 'Madras' by the City of Madras (Alteration of Name) Act, 1996 (Tamil Nadu Act 28 of 1996).] Metropolitan Area;