The initiative and referendum are reserved by this Charter to the people of Deer Park to be exercised as prescribed in this Charter. Electors qualified by registration and otherwise to vote in Deer Park, and equal in number to not less than one-fifth of the number of those who voted in the preceding general election, may by an initiative petition propose to Council the passage of an ordinance or resolution set forth therein, or by a referendum petition propose the repeal of any measures passed within thirty days by Council, except as otherwise prescribed in this Charter.