Pub. Util. Code, § 13633

Evidences of indebtedness issued pursuant to this article shall be payable from any sources of available funds of the special district, including revenues, taxes, or state or federal grants. If not previously otherwise paid the evidence of indebtedness shall be paid from the proceeds of the next sale of the bonds of the district in anticipation of which they were issued, and if not so paid, the board is hereby authorized to levy and collect taxes from all property in the special district subject to taxation by the district without limitation of rate or amount for the payment of such evidences of indebtedness. Such taxes shall be in addition to all other taxes levied for special district purposes and shall be levied at the same time and in the same manner as other district taxes are levied and when collected shall be deposited in a special fund and shall be used for no purpose other than the payment of the principal of, and interest on, such indebtedness.