The planning commission shall have the power and duty to prepare and recommend to the city council for adoption a comprehensive plan for the physical development and betterment of the city, including any areas outside its boundaries which, in the commission's judgment, bear relation to the planning of the city. The comprehensive plan shall be reviewed and updated every five (5) years or more often when population growth and land use changes warrant plan revisions. (Ord. 1993-4, 7-15-1993)