All outdoor swimming pools now existing or to be constructed shall be enclosed by a substantial fence not less than forty-eight inches in height, so constructed as to prevent within reason any person from gaining access beneath or through the fence and which shall have a similarly substantial gate of the same height as the fence, with facilities for locking the gate when the pool is unguarded. The swimming pool gate is to be kept closed at all times except when opened for the purpose of ingress or egress. (Ord. 1329, §11, 1980).