Gov. Code, § 67572

The commission may issue bonds in series and may divide any series into one or more divisions and fix different maturities or dates of such bonds, different rates of interest, or prescribe different terms and conditions for the bonds of the several series or divisions. It is not necessary that all bonds of the same authorized issue be of the same kind or character, have the same security, or be of the same interest rate, but the terms thereof shall in each case be provided for by the commission, at or prior to the issue thereof. The commission may provide for successive issues or may provide for one maximum issue. The commission may provide that all bonds, or the bonds of any specified issue, shall be paid from and secured by the revenues of the specified facilities, all in the manner and upon the terms set forth in the indenture.