The funds authorized to be appropriated pursuant to section 390g–5 of this title shall match on a four-to-one basis funds made available by the States, their political subdivisions, or other non-Federal entities to meet the cost of phase II: Provided, That, inkind services or other contributions by the States, their political subdivisions, or other non-Federal entities shall be considered in the determination of the matching non-Federal share. The Secretary is authorized to enter into memoranda of agreement with any appropriate agencies or departments of the High Plains States and other Reclamation Act States to share the costs of phase II.