Except as otherwise expressly provided in this code, the city shall generally be organized with such offices, departments and personnel as are provided for in the municipal charter (see particularly Chapter 21) with the city manager serving as the overall administrative head of the municipal government under the direction and supervision of the board of commissioners. (For other and more detailed provisions relating to administration, officers and personnel, see the municipal charter, particularly chapters 20, 21, and 22. See also the appropriate related titles in this code for provisions relating to the building and utility inspectors, fiscal affairs, fire department, utilities, etc. For provisions relating to the administration and operation of utilities, see Title 13 in this code).