Revenues received by the state water commission from water user entities or otherwise for operation and maintenance of the northwest area water supply project must be maintained, as a part of the moneys of the state received and kept by the state treasurer in a fund to be designated as the northwest area water supply project operation and maintenance fund. All moneys received by the state treasurer for operation and maintenance of the northwest area water supply project and the interest on moneys in the fund must be kept by the state treasurer in the fund distinct from all other moneys and must be disbursed by the state treasurer and used only for paying for costs and expenditures for operation and maintenance of the northwest area water supply project.