Cal. Water Code § 13999.15

Upon request of the board or department, the committee shall determine whether or not it is necessary or desirable to issue bonds authorized under this chapter in order to make those arrangements, and, if so, the amount of bonds to be issued and sold. Successive issues of bonds may be authorized and sold to make those arrangements progressively, and it shall not be necessary that all of the bonds authorized to be issued shall be sold at any one time.