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<br />.'~.'. <br />,) <br /> <br />the sources from which these uses will actually be met must be left <br />open. The releases at Hoover Dam to meet these uses have varied in <br />the past and can be expected to vary in the future. The trend of re- <br />lease during the filling period will likely be upwards--as more land <br />is brought under irrigation or a greater use is made for domestic and <br />industrial purposes. At the same time uses in the Upper Basin also <br />will be increasing. There is, of course, a relationship between the <br />extent of Upper Basin uses and the availability of water to the Lower <br />Basin. The studies performed by the engineering groups assumed re- <br />leases at Hoover of 7.5 million acre-feet by the Upper Basin group, <br />as well as assumptions by both groups of 8.5 million acre-feet in <br />1962, increasing to 9.3 million acre-feet in 1970 and remaining con- <br />stant thereafter. What releases for these purposes may be in the <br />future are matters of judgment. All aspects considered, it seems to <br />us that they may be expected to range from 8.2 to 8.5 million acre- <br />feet per year during the filling period. <br /> <br />To be noted is the proposal to hold the scheduled delivery <br />under the Mexican Treaty to 1.5 million acre-feet per year. This is <br />the Mexican Treaty obligation. It serves to put the Mexican users on <br />notice that during this period there likely will not be any water <br />whereby the scheduled delivery could reach 1.7 million acre-feet per <br />year which is permissible under the Treaty on an "if available" <br />basis. <br /> <br />Paragraph 4 is similar in content to paragraph 3 in that it <br />repeats the principle that uses of water for consumptive purposes <br />will be met but the paragraph applies to the reach of the river be- <br />tween Glen Canyon Darn and Lake Mead and to the use of water directly <br />out of Lake Mead. It is necessary to separate the uses between Glen <br />Canyon and the upper end of Lake Mead from those which are or might <br />be made directly out of Lake Mead, because the former can be served <br />only by two sources, namely, Glen Canyon releases or tributary inflow, <br />while the latter can be served by both of these sources or from water <br />stored in Lake Mead. The uses of water between Lake Mead and Glen <br />Canyon contemplated are the historical uses including pumping from <br />Lake Mead plus an increased annual use of possibly 100,000 acre-feet <br />for consumptive purposes during the filling period, plus evaporation <br />losses from Lake Mead. <br /> <br />Paragraph 5 is the statement of principle that there will <br />be an allowance for computed efficiency in Hoover firm energy which <br />is created by virtue of the operation of Glen Canyon. This paragraph <br />also defines deficiency for purposes of computing the amount of al- <br />lowance. Determination of deficiency depends upon two calculations. <br />The first calculation would be one to determine the so-called Hoover <br />basic firm which is that firm energy that would have been produced in <br />that year at Hoover without Glen Canyon on the river. The Hoover <br />basic firm would be determined by starting with the actual content of <br />Lake Mead in the year 1962 and running a simulated operation study of <br /> <br />5 <br />