Cal. Water Code § 12939

Upon the written request of the board, supported by a statement of the expenditures made and to be made for the State Water Resources Development System, the committee shall determine whether or not it is necessary or desirable to issue any bonds authorized under this chapter in order to make those expenditures and, if so, the amount of bonds then to be issued and sold. Successive issues of bonds may be authorized and sold to make those expenditures progressively and it shall not be necessary that all of the bonds herein authorized to be issued shall be sold at any one time.