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Private residential swimming pools shall be provided with overflow gutters on all vertical walls and shall extend around the entire perimeter of the pool. The overflow gutter shall be of the open, roll over or semi- recessed type, having a smooth finish. The lip or overflow gutter edge shall be level, the overflow gutter shall have a minimum depth of 4 inches (100 mm); the overflow gutter bottom shall have a slope toward each drain and have a pitch not less than 1/4 inch (6 mm) to the foot (300 mm); drain spacings shall be a minimum of 15 feet (3.95 m) on centers; drain pipelines shall be at least 3 inches (75 mm) in diameter; outlet fixtures shall have a grate opening of at least twice the cross-sectional area of the drain pipe; the drain lines shall have an indirect connection to the sewer. The drainage system shall be constructed in accordance with Article 7 of this chapter.