The people, by their approval of this chapter at the election herein provided, hereby authorize the city council, by ordinance or resolution duly enacted, to enter into an agreement with other parties to carry out the intent and purpose of this chapter, to make such administrative and technical changes or additions in the method and manner of administration and enforcing this chapter as may be necessary or proper for efficiency and fairness; except, that the rate of the tax herein provided shall not be changed without approval of the qualified electors of the city as provided by law. (1992 Code § 7-822)