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<br />C) <br />co) <br />N <br />-J <br />C.\') <br />~,l <br /> <br /><, <br />, <br /> <br />" <br />, <br /> <br />, ., <br /> <br />.I. Executive Summary <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 Reseryoir._"Q~~~hl~.amgu~t, 3,000 acre-feet annually has been <br />reserved for use in perpetuity by the Jicarilla Apache Tribe, 69,000 <br />acre-feet per year, previously identified by the 1984 hydrologic <br />investigation, is available for marketing through the year 2039, and an <br />additional 22,500 acre-feet per year is available for marketing from Navajo <br />Reservoir in perpetuity. This depletion level can be achieved under the <br />same shortage criteria upon which the allowable annual depletion level of <br />5.8 MAF was determined in the 1984 hydrologic investigation, without <br />significant 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 asa 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 />(Acre-feet/year) <br />1988 Investigation <br />50,000 <br />3,079,500 <br />669,500 <br />1,368,000 <br />833,000 <br /> <br />1 <br />