; (3) affect any contract or agreement between the Bureau of Indian Affairs and the Bureau of Reclamation; (4) affect, waive, abrogate, diminish, define, or interpret the treaty between the Yakama Nation and the United States; or (5) constrain the continued authority of the Secretary to provide fish passage in the Yakima Basin in accordance with the Hoover Power Plant Act of 1984 ( 43 U.S.C. 619 et seq.). 1214. Operational control of water supplies The Secretary shall retain authority and discretion over the management of project supplies to optimize operational use and flexibility to ensure compliance with all applicable Federal and State laws, treaty rights of the Yakama Nation, and legal obligations, including those contained in this Act. That authority and discretion includes the ability of the United States to store, deliver, conserve, and reuse water supplies deriving from projects authorized under this title. . D Klamath Project Water and Power 9301. Klamath Project (a) Addressing water management and power costs for irrigation The Klamath Basin Water Supply Enhancement Act of 2000 ( Public Law 106–498 ; 114 Stat. 2221) is amended— (1) by redesignating sections 4 through 6 as sections 5 through 7, respectively; and (2) by inserting after section 3 the following: 4. Power and water management (a) Definitions In this section: (1) Covered power use The term covered power use means a use of power to develop or manage water for irrigation, wildlife purposes, or drainage on land that is— (A) associated with the Klamath Project, including land within a unit of the National Wildlife Refuge System that receives water due to the operation of Klamath Project facilities