Every private outdoor swimming pool shall be completely surrounded by a fence or wall not less than four feet in height, which shall be so constructed as not to have openings, holes or gaps larger than four inches in any dimension except for doors and gates. A dwelling house or accessory building may be used as part of such enclosure. All gates or doors opening through such enclosure shall be equipped with a self-closing and self-latching device for keeping the gate or door securely closed at all times when not in actual use, except that the door of any dwelling which forms a part of the enclosure need not be so equipped. The building official of the city may permit modifications of the foregoing requirements in individual cases, upon a showing of good cause with respect to the height, nature or location of the fence, wall, gates or latches, or the necessity therefor; provided, that the protection as sought hereunder is not reduced thereby. The building official may permit other protective devices or structures to be used so long as the degree of protection afforded by the substitute devices or structures is not less than the protection afforded by the wall, fence, gate and latch required in this section. (Prior code § 5-1101)