Idaho Code § 42-1742
Bonds issued under the provisions of this act shall be payable solely out of revenues of the Idaho water resource board. Such bonds shall be authorized by resolution, which resolution shall create a special fund or funds into which the Idaho water resource board shall obligate and bind the board to set aside and pay any part or parts of, or all of, or a fixed proportion of, or a fixed amount of the available revenue of the board sufficient to pay the principal of and interest on such bonds as the same shall become due and, if deemed necessary, to maintain adequate reserves therefor. No appropriated moneys shall be paid into such special fund or funds provided that any loan repayments to the Idaho water resource board, regardless of the source of funds for the loan, may be deposited to such fund or funds. Such fund or funds shall be drawn upon for the sole purpose of paying the principal of and interest on bonds issued pursuant to this act.
The bonds shall be negotiable instruments within the provisions and intent of the negotiable instrument laws of this state even though they shall be payable solely from such special fund or funds. The bonds and any coupons attached thereto shall state upon their face that they are payable solely from such special fund or funds. If the board fails to set aside and pay into such fund or funds the payments provided for in such resolution, the holder of any such bonds may bring suit to compel compliance with the provisions of the resolution.
Idaho Code § 42-1742