1. 
Except as subsection 3 of this section provides for reading by title or bill number only, and except as subsection 2 of this section provides for immediate adoption of emergency measures, an ordinance before being finally adopted, shall be fully and distinctly read in open council meeting on two days.
2. 
Except as subsection 3 of this section provides for reading by title or bill number only, an ordinance necessary to meet an emergency may, upon being read in full and then by title, be adopted at a single meeting of the council by an unanimous vote of all councilors present.
3. 
Any reading of an ordinance for purposes of adoption may be by title or bill number only:
A. 
If no councilor present at the meeting requests that the ordinance be read in full; or
B. 
If for one week prior to the reading a copy of the ordinance is provided each councilor and copies are available for public inspection at the office of the mayor or city administrator during regular office hours and notice of their availability is posted at City Hall or published once in a newspaper of general circulation in the city.
4. 
An ordinance adopted after being read by title or bill number only has no legal effect if it differs substantially from its terms as they stand when so read, unless each section incorporating such a difference, as finally amended prior to being adopted by the council, is fully and distinctly read in open council meeting.
Upon the adoption of an ordinance by the council, the mayor shall sign the ordinance and indicate the date of the signing of his or her signature.
Except when a later time for it to take effect is provided, an ordinance adopted by the council takes effect on the thirtieth day after its adoption by the council unless it is necessary to have immediate effect for the preservation of the peace, health, safety and welfare of the city, in which event it takes effect immediately upon its adoption.