In case of a vacancy in office or during the absence of any department head, the City Manager may designate an interim acting head, but any interim appointment shall be terminated if thereafter disapproved by the City Council. All department heads shall keep informed as to the latest practices in their particular field and shall inaugurate, with the approval of the City Manager, such new practices as appear to be of benefit to the service and to the public.
(‘83 Code, § 32.03)