B-1.1, r. 11 - Regulation respecting safety in public baths

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3. The walls of a pool shall be vertical 150 mm from the bottom for the section that is between 750 mm and 1,400 mm, and vertical to the bottom for the section that is less than 750 mm in depth, except for the section filled by stairs or a ladder.
R.R.Q., 1981, c. S-3, r. 3, s. 3.