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<br />~ <br /> <br />~ <br /> <br />. <br /> <br />, <br /> <br />I. Executive Summary <br /> <br />. <br /> <br />. <br /> <br />Determination as to the availability of water under long-term service con- <br />tracts for municipal and industrial (M&I) uses from Navajo Reservoir <br />involves a projection into the future of estimated water uses and water <br />supplies. On the basis of this hydrologic investigation, water depletions <br />for the Upper Basin of the Colorado River can be reasonably allowed to rise <br />to 6 million acre-feet (MAF) annually. This determination certifies the <br />availability of 94,500 acre-feet of water annually for marketing from <br />Navajo Reservoir. Of this amount, 3,000 acre-feet annually has been <br />reserved for indefinite use by the Jicarilla Apache Tribe, 69,000 acre-feet <br />per year, previously identified by the 1984 hydrologic investigation, is <br />available for marketing through the year 2039, and 22,500 acre-feet per <br />year is available for marketing from Navajo Reservoir on a longer term <br />basis. This depletion level can be achieved under the same shortage <br />criteria upon which the allowable annual depletion level of 5.8 MAF was <br />determined in the 1984 hydrologic investigation, without significant <br />increase in the level of risk. <br /> <br />To avoid a critical compact interpretation, we assume that the Upper Basin <br />will be obligated to deliver 75 MAF of water every 10 years at Lee Ferry, <br />plus 750,000 acre-feet annually toward Mexican Treaty deliveries. This <br />would require an average annual water delivery at Lee Ferry of at least <br />8.25 MAF. It must be noted here that the upper Colorado River Commission, <br />comprised of representatives of the Upper Basin States, does not agree with <br />delivery of the 750,000 acre-feet annually toward the Mexican Treaty <br />obligation. <br /> <br />The change in maximum depletion levels for the Upper Basin States under the <br />previously mentioned assumptions, and as a result of this investigation is <br />as follows: <br /> <br />state <br />Arizona <br />Colorado <br />New Mexico <br />Utah <br />Wyoming <br /> <br />Depletion Levels <br /> <br />1984 Investigation <br /> <br />50,000 <br /> <br />2,976,000 <br /> <br />647,000 <br /> <br />1,322,000 <br /> <br />805,000 <br /> <br />1 <br /> <br />(Acre-feet/year) <br />1987 Investigation <br />50,000 <br /> <br />3,079,500 <br />669,500 <br /> <br />1,368,000 <br />833,000 <br />