SECTION 13. EMERGENCY MEASURES.
   All ordinances and resolutions passed by the City Commission shall be in effect from and after thirty days from the date of their passage, except that the annual appropriation ordinance and all resolutions and ordinances providing for or pertaining to public improvements, to pay the costs of which special assessments upon the property benefited are to be made and not more than fifteen percent of the cost of which is by the terms of such resolution or ordinance to fall directly upon the City, shall be in effect from and after fifteen days from the date of their passage; provided, however, that the City Commission may, upon the written recommendation of the City Manager by an affirmative vote of all of its members, pass emergency measures to take effect at the time indicated therein, but nothing in this section shall be considered to prevent, after the passage of any ordinance or resolution, the immediate giving of any notice, or the making of any publication, required by such ordinance or resolution.
   An emergency measure is an ordinance or resolution for the immediate preservation of the public peace, health, safety or property, or providing for the usual daily operation of a municipal department, in which the emergency is set forth and defined in a preamble thereto; but no measure, making a grant or letting a contract, renewal or extension of a franchise, or other special privilege, or regulating the rate to be charged for its service by any public utility, or amending or repealing any measure adopted by the people at the polls or by the City Commission in compliance with an initiative petition, shall ever be regarded as an emergency measure.