; (2) any funds that have been appropriated pursuant to section 7 of this Act but not expended shall immediately revert to the general fund of the United States; and (3) any funds contributed by the State pursuant to subsection (f)(2) of section 6 of this Act but not expended shall be returned immediately to the State. (c) Extension The expiration date set forth in subsection (b) may be extended if the Navajo Nation, the State, and the United States (acting through the Secretary) agree that an extension is reasonably necessary. 10. Waivers and releases (a) Claims by the Navajo Nation and the United States In return for confirmation of the Navajo Nation’s federally reserved water rights, the water rights or rights to use water of allottees in Utah, and other benefits set forth in the agreement and this Act, and in return for a waiver of claims by the State against the Nation and the United States acting in its trust capacity, the Nation and the United States acting in its trust capacity hereby waive and release— (1) all claims for water rights within Utah based on any and all legal theories that the Navajo Nation, allottees, or the United States acting in its trust capacity, asserted, or could have asserted, at any time in any proceeding, including to the general stream adjudication, up to and including the enforceability date, except to the extent that such rights are recognized in the agreement and this Act