Idaho Code § 43-413
The board of directors of any irrigation district organized under the laws of this state, may, when in the opinion of the board it will improve the credit of the district, or the marketability of the district bonds, or tend to reduce the rate of interest necessary to be paid thereon, or in any other way be to the benefit of the district, provide by the adoption of a suitable resolution of the board of directors for inserting in the bonds of the district or the district contract of the United States, an agreement to the effect that a safety fund will be provided to insure the payment of the district's obligations under the bonds or contract. Said resolution shall provide that the safety fund provided for in this section may be funded through either or both of the following methods:
Said safety fund shall be used to meet any deficiency which might otherwise occur in the payment of the principal and interest of said bonds or contract obligations as set forth in the resolution providing for the safety fund and said safety fund shall be kept intact by initiating or renewing such fifteen per cent (15%) excess levies whenever such safety fund is reduced below ten per cent (10%) of the unpaid bonded indebtedness or United States contract indebtedness of the district and continuing the same until such safety fund is again brought up to at least ten per cent (10%) of such unpaid bond or contract indebtedness.
Whenever such agreement shall have been inserted in the bonds or contract of any irrigation district, all levies thereafter made in such district shall be made in full compliance with such agreement until such bonds or contracts have been fully paid.
Idaho Code § 43-413