After making allowances for contingencies and error in the estimates, the charges, together with any other funds which under this chapter can legally be, and which are, pledged or otherwise made available for the respective purposes hereinafter set forth, shall be at least sufficient to pay the following amounts in the order set forth:
(a)
The interest on and principal of the bonds as they become due and payable.
(b)
All payments required for compliance with the resolution authorizing the issuance of the bonds or any other contract with the bondholders, including the creation of sinking and reserve funds.
(c)
All payments to meet any other obligations of the local agency which are charges, liens, or encumbrances upon, or payable from, the revenues of the enterprise.
(d)
All current expenses of maintenance and operation of the enterprise, except that if the legislative body provides in the resolution calling the election that maintenance and operation costs of the enterprise shall be paid from the revenues prior to the principal, interest and sums for other security funds, then the current expenses of such maintenance and operation shall precede any other payments provided in this section.