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<br />00079: <br /> <br />The Ilureau tal" us that while tree ring hydrolo<:JY has <br />future potential, it has not yet been proven reliable. <br /> <br />SUFFICIENT WATER FOR PRESENT <br />BUT NOT FUTURE QEMANDS <br /> <br />As riiscussed in chapter I, the Upper and Lower Basins <br />were allocated 7.5 maf each by the 1922 conpact and Mexico <br />was allocated 1.5 maf by the 1944 Mexican Water Treaty for <br />a total allocation of 16.5 naf. 1/ Rased on nost projections <br />of future virgin flows, these allocations substantially <br />exceed the river's dependable water supply. <br /> <br />During the period 1971 to 1975, Bureau records show <br />that, in addition to the water being stored (see app. IV), <br />an avera<:Jc of 12.3 maf of Colorado River water was used <br />for the following purposes. <br /> <br /> Upper Lower <br /> Type of use Basin Basin Mexico Total <br /> -- <br /> - - - - - ( maf) - - - <br />Basin exports (note a) 0.69 4.69 5.38 <br />Irrigated agriculture 2.19 1. 58 3.77 <br />Water to Mexico 1. 61 1. 61 <br />Reservoir evaporation <br />losses 0.53 0.73 0.01 1. 27 <br />r~unicipal & industrial 0.12 0.09 0.21 <br />wildlife and recreation 0.02 0.04 0.06 <br /> --- <br />Total 3.55 7.13 1. 62 12.30 <br /> .-- <br />~/Includes irrigation, municipal, and inriustrial water. <br /> <br />The Bureau estinates that by 1990 the Lower Basin States <br />and Mexico will be using an average annual 9.5 naf of main- <br />stream water, including losses, with the Upper Basin using <br />5.3 maf if presently planned developnent occurs. (See chart, <br />p. 11.) The Upper Basin's water use rate beyond 1990 is <br />highly conjectural, depending largely upon the uncertain <br />development of the area's huge reserves of oil shale and coal. <br /> <br />l/As stated in chapter 1 and appendix I, the 1922 Conpact, <br />the Boulder Canyon Project Act, and the 1964 Supreme Court <br />decree in California v. Arizona indicate that the Lower <br />Basin was allocated 7.5 nal: from the Colorado River nain- <br />flow. The source of the additional 1 maf allocated to the <br />Lower Basin is not clearly identified in these documents. <br /> <br />9 <br />