It is unlawful for any person to deposit, drain, wash, allow to run or divert into or upon any public road, highway, street or alley, drainage ditch, storm drain or flood-control channel owned by or controlled by any public agency within the city any water, mud, sand, oil or petroleum; except, upon written application of any person filed with the city clerk for presentation to the council, the council may, upon such terms and conditions as it may deem advisable to impose, including the charging of a fee therefor, grant a permit to such person to do any of the acts prohibited by this section, provided the same shall not be detrimental to the public health, safety, morals or welfare. (Prior code § 14-22)