The city has been faced with problems in providing a more extensive means of guiding development of land so as to ensure a safer, more pleasant and more economical environment for residential, commercial, industrial and public activities.
(Ord. passed 6-9-1947; Ord. passed 12-19-1949; Ord. passed 7-8-1955; Ord. passed 11-16-1959; Ord. passed 3-28-1960; Ord. passed 7-8-1974; Ord. passed 4-28-1975; Ord. 8.24, passed 9-17-1979)