Idaho Code § 42-1776
There is hereby created and established in the agency asset fund the water resources conservation and development trust account. All moneys in the account are to be utilized by the Idaho water resources board, upon appropriation by the legislature, to conduct water project feasibility and engineering studies authorized in conjunction with the powers and duties of the board as provided in section 42-1734, Idaho Code, and to secure revenue bonds authorized by section 42-1739, Idaho Code.
The state treasurer is directed to invest all moneys in the account. All interest or other income occurring from such investment shall accrue to the account.
In the event that a project is approved subsequent to a feasibility study funded from the account, the funds expended from the account shall be included as a cost of the project to be repaid to the fund through repayments contracted by the board. It shall be the duty of the board to specify such repayment provisions without regard to the source of funding of the project.
Idaho Code § 42-1776