No person, firm or corporation shall throw, discharge, dump, deposit or cause or permit to be thrown, discharged, dumped or deposited any clay, earth, ashes, stone, timbers, rubbish, junk or similar substance in the harbor unless such matter shall be placed inside of an approved retaining wall so arranged as not to permit the escape of such substance into the waters of the harbor.
(1952 Code § 22-2-1; Ord. 718-61)