Sunken vessels or watercraft, refuse of all kinds, structures or pieces of any structure, dock sweepings, dead fish or parts thereof, dead animals or parts thereof, timber, logs, piles, boom sticks, lumber, boxes, empty containers and oil of any kind floating uncontrolled on the water, and all other substances or articles of a similar nature, are declared to be public nuisances. It is unlawful for any person to throw or place in, or cause or permit to be thrown or placed any of the above-named articles or substances in the waters of the city, or upon the shores thereof or in such position that the same may or can be washed into said waters, either by high tides, storms, floods or otherwise. Any person causing or permitting said nuisances to be placed as aforesaid shall remove the same, and upon failure to do so, the same may be removed by the city and the expense thereof shall be paid by and recoverable from the person creating said nuisance. In all cases such nuisances may be abated in the manner provided by law. The abatement of any such public nuisances shall not excuse the person responsible therefor from prosecution hereunder. (Ord. 5956 § 21, 2010; 1961 code § 13.09.310.)