Cal. Pub. Util. Code § 100409

Whenever the board deems that the expenditure of money for the purposes for which the bonds were authorized by the voters is impractical or unwise, it may, by ordinance adopted by a vote of two-thirds of all members of the board, so declare and call an election to be held in the district for the purpose of submitting to the qualified voters thereof the proposition of incurring indebtedness by the issuance of such bonds for some other purposes or, in the case where bonds have been sold, the proposition to use the proceeds for some other purposes. The procedure, so far as applicable, shall be the same as when a bond proposition is originally submitted.