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Show 4. The Colorado River Compact is relevant for some purposes. It provided an interbasin division which must be respected. Also, some of its terms are incorporated in the Project Act and thus are made applicable to the Lower Basin. There are other references in the Project Act to the Compact. These were placed in the Act to insure that the Act would not "upset, alter, or affect the Compact Congressionally approved division of water between the Basins." 5. Congress, by the Boulder Canyon Project Act, intended to divide only the Lower Basin mainstream waters between Arizona, California, and Nevada, leaving the tributaries in the Lower Basin to the State wherein the tributaries are located. 6. Congress has made this division of the mainstream in the Project Act by first placing a limitation on California in the amount of 4,400,000 acre-feet of beneficial consumptive use per annum in Section IV (a) of said Act, leaving a balance of 3,100,000 acre-feet for the States of Arizona and Nevada. In Section V, Congress authorized the Secretary of the Interior to make the division of this water by authorizing the Secretary of the Interior to contract for deliveries of water from Lake Mead, and by providing further that no water could be used from Lake Mead except under contracts. In granting this power of contracts, Congress intended to allow the Secretary of the Interior to apportion the river. The Secretary of the Interior has, by contract, made this apportionment which divides the mainstream in the Lower Basin as follows: Of the first 7,500,000 acre-feet of water available for beneficial consumptive use, California is to have 4,400,000 acre-feet; Arizona is to have 2,800,000; and Nevada is to have 300,000 acre-feet. Any surplus over and above the first 7,500,000 acre-feet is to be divided equally between Arizona and California. 7. The Secretary of the Interior is authorized to determine the method by which shortages of water are to be shared, should any shortages arise. 8. Lower Basin tributaries are to be used in the State wherein the tributaries are located and are not to be considered by the Secretary in making his division of mainstream water. 9. The Secretary of the Interior is in no way controlled by State water laws in making his contracts with individual water users within a State. Neither do State water laws control the Secretary in the allocation of water in case of shortage, except insofar as the Secretary is required to respect "present perfected rights under the Boulder Canyon Project Act." Since the Project Act provided for 31 |