Section 27(7) in Tamil Nadu Urban Local Bodies (Regulation and Monitoring of Swimming Pools) Rules, 2015
(7)Depth Markers - (i) The depth of water shall be marked at or above the water surface on the wall of the pool and on the edge of the deck next to the pool so as to be readable by persons entering or in the pool. Depth markings shall be provided at the shallow and deep ends of the pool, the transition point, and the point of maximum depth, and shall be spaced at not more than 7.5 m intervals measured peripherally, except that depth markings are not required at a zero-depth edge.(ii)Depth markers shall indicate pool depth in metric system, and shall be of a color that contrasts with the background. Numerals indicating depth shall be a minimum of 10 cm high.(iii)In shallow areas, "no diving" markers or symbols at least 10 cm high must be located at not more than 7.5 m intervals around the pool perimeter except at a zero-depth edge.
