567—75.9 (335,414,455B) Notice of proposed department flood plain management order or proposed local flood plain regulation. The department shall not issue a flood plain management order establishing encroachment limits or flood plain management regulations until public notice of the proposed establishment thereof has been given and a public hearing held to provide opportunity for the presentation of all protests. Public notice and a hearing shall not be required for department approval of flood plain management regulations proposed by local governments provided that such local governments give public notice and conduct public hearings as required by their enabling legislation which authorizes local adoption of the flood plain management regulations.