The first priority for expenditure of amounts in the Fund during the entire period in which the Fund is in existence shall be for the purposes described in, and in the order of, clauses (i) through (iv) of subparagraph (B).

The Secretary shall reserve and use amounts deposited into the Fund in accordance with subclause (I).

Any amounts in the Fund that are not needed for the purposes described in subparagraph (B) may be used for other purposes authorized in paragraph (2).

Subject to subclause (II), effective beginning January 1, 2020, if, in the judgment of the Secretary on an annual basis the deadline described in section 10701(e)(1)(A)(ix) 1

Except as provided under item (bb), the amount expended under subclause (I) shall not exceed $500,000,000 for the period of fiscal years 2020 through 2029.

The limitation on the expenditure amount under item (aa) may be exceeded during the entire period in which the Fund is in existence if such additional funds can be expended without limiting the amounts identified in clauses (ii) through (iv).

Subject to subclause (II), effective beginning January 1, 2020, in addition to the funding made available under clause (i), if in the judgment of the Secretary on an annual basis a sufficient amount of funding is not otherwise available through annual appropriations, the Secretary shall expend from the Fund such amounts on an annual basis consistent with paragraphs (1) and (2), as are necessary to pay the Federal share of the remaining costs of implementing the Indian water rights settlement agreements entered into by the State of New Mexico in the Aamodt adjudication and the Abeyta adjudication, if such settlements are subsequently approved and authorized by an Act of Congress and the implementation period has not already expired.

The amount expended under subclause (I) shall not exceed $250,000,000.

Subject to subclause (II), effective beginning January 1, 2020, in addition to funding made available pursuant to clauses (i) and (ii), if in the judgment of the Secretary on an annual basis a sufficient amount of funding is not otherwise available through annual appropriations, the Secretary shall expend from the Fund such amounts on an annual basis consistent with paragraphs (1) and (2), as are necessary to pay the Federal share of the remaining costs of implementing Indian water rights settlement agreements entered into by the State of Montana with the Blackfeet Tribe, the Crow Tribe, or the Gros Ventre and Assiniboine Tribes of the Fort Belknap Indian Reservation in the judicial proceeding entitled “In re the General Adjudication of All the Rights to Use Surface and Groundwater in the State of Montana”, if a settlement or settlements are subsequently approved and authorized by an Act of Congress and the implementation period has not already expired.

Except as provided under item (bb), the amount expended under subclause (I) shall not exceed $350,000,000 for the period of fiscal years 2020 through 2029.

The limitation on the expenditure amount under item (aa) may be exceeded during the entire period in which the Fund is in existence if such additional funds can be expended without limiting the amounts identified in clause (i), (ii), and (iv).

The Secretary shall ensure that any funding under this clause shall be provided in a manner that does not limit the funding available pursuant to clauses (i) and (ii).

Subject to subclause (II), effective beginning January 1, 2020, in addition to funding made available pursuant to clauses (i), (ii), and (iii), if in the judgment of the Secretary on an annual basis a sufficient amount of funding is not otherwise available through annual appropriations, the Secretary shall expend from the Fund such amounts on an annual basis consistent with paragraphs (1) and (2), as are necessary to pay the Federal share of the remaining costs of implementing an Indian water rights settlement agreement entered into by the State of Arizona with the Navajo Nation to resolve the water rights claims of the Nation in the Lower Colorado River basin in Arizona, if a settlement is subsequently approved and authorized by an Act of Congress and the implementation period has not already expired.

Except as provided under item (bb), the amount expended under subclause (I) shall not exceed $100,000,000 for the period of fiscal years 2020 through 2029.

The limitation on the expenditure amount under item (aa) may be exceeded during the entire period in which the Fund is in existence if such additional funds can be expended without limiting the amounts identified in clauses (i) through (iii).

The Secretary shall ensure that any funding under this clause shall be provided in a manner that does not limit the funding available pursuant to clauses (i) and (ii).