Any person who shall open any hole in the ice covering any waterway, shall, before leaving the same unattended, mark or barricade the same so that the hazardous condition is readily apparent to a reasonably observant person. No person shall open any hole in the ice covering any waterway which hole is more than six inches in diameter without having previously secured from the Director of Public Safety of the city written authorization to make such opening. Any such written authorization shall define the location and size of any such opening and the manner in which the same is to be attended, marked or barricaded.
(Prior Code, § 3.102)