To identify and distinguish the revenues received by the southwest water authority from water user entities for operation and maintenance of the southwest pipeline project, the southwest water authority shall maintain a fund designated as the southwest pipeline project operation and maintenance fund. All moneys received by the southwest water authority, whether from payments made by water user entities, or otherwise, for operation and maintenance of the southwest pipeline project must be by law or by other authoritative designation made applicable to the payment of operation and maintenance of the southwest pipeline project, must be kept in the fund distinct from all other moneys, and must be disbursed only for the particular purpose or purposes for which the moneys were received.