There shall be and is hereby created a department of public works of the city which shall have cognizance over the municipal water system, streets, buildings, cemetery, parks, recreation areas, monuments, airport and the garbage and trash collection and disposal, and any other facility or service that the common council shall from time to time include. The department shall be under the supervision of the director of public works. (Ord. 5-78-79, 6-18-1979)