For the purpose of this title and in the interest of the greatest use of the boat harbor facilities by the general public, boats in the boat harbor which are derelicts, unfit or unseaworthy, or which are maintained in such manner as to make them liable to sinking for lack of being pumped or other maintenance, or which are maintained in a manner so as to constitute a fire hazard to the harbor facilities or to boats lawfully occupying the same for any period of 30 or more days after the effective date of the ordinance codified herein, and sunken boats and boats in imminence of sinking, are declared to be nuisances and subject to abatement and removal from the harbor facilities by the City, or its agents, without liability on the City for any damage done by virtue of the removal. Boats removed from the boat harbor under the provisions of this section shall be disposed of as provided in this section. [Code 1979 § 18.20.010.]