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Nonprivate swimming pools shall be entirely surrounded by overflow gutters having the necessary pitch to prevent any accumulations, having ample size to carry off normal amounts of water introduced into them, and having easy access for cleaning. This section shall be deemed to have been satisfied when the following conditions are met:
1. The overflow gutter extends around the entire perimeter of the pool; the overflow gutter edge is level within 2/10 inch (5 mm) on pools smaller than 40 feet (12.2 m) by 85 feet (25.9 m) and 2/10 inch (eight mm) on larger installations.
2. The overflow gutter bottom has a pitch of not less than 3 inches (75 mm) in 10 feet (3.05 m).
3. The drains are a maximum of 15 feet (4.57 m) on centers.
4. The runoff capacity is sufficient to carry away all normal amounts of water splashed or displaced into them without flooding of the overflow gutter.
5. The overflow gutter has a minimum depth of 4 inches (100 mm).
6. The overflow gutter is of the open, roll-over or semiprocessed type, having a smooth finish and having an opening sufficient to permit satisfactory cleaning of the overflow channel.
7. Overflow drains that discharge to a sewer have a free-fall discharge with an atmospheric break of 2 inches (50 mm) minimum.
8. Drain lines shall be at least 2 1/2 inches (64 mm) in diameter.
9. Satisfactory proof can be furnished to the buildings department that adequate runoff capacity will be obtained by other arrangements or modifications in gutter design proposed for use in “closed” or reverse flow systems of recirculation.
Exceptions:
1. At pools having a water surface area of 1,500 square feet (139.35 m
2
) or less and which are expected to have only light skimmer loading, automatic surface skimmers may be provided in lieu of overflow gutters in the proportion of one skimmer per each 500 square feet (46.45 m
2
) or fraction thereof. Such skimmers shall be built into the wall and have an automatically controlled equalizer pipe to prevent air- lock in the suction line.
2. Skimmer return piping shall be not less than 2 inches (50 mm) in diameter. The equalizer pipe shall be not less than 2 inches (50 mm) in diameter and be located at least 1 foot (300 mm) below the lowest overflow level of the skimmer.