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<br />I <br />.'i <br />I <br /> <br />o <br />i::1 <br />c) <br />Co\) <br />N <br />N <br /> <br />. ~ <br /> <br />i..': <br /> <br />CONSUMPTIVE USES AND LOSSES <br />IN THE <br />ARIZONA PORTION <br />OF THE <br />UPPER COLORADO RIVER BASIN <br />FOR THE <br />WATER YEAR 1990 <br /> <br />AUTHORITY <br /> <br />This report was prepared in compliance with Public Law 90-537, <br />Section 601(bX1), dated September 30, 1968, which directs the Secretary of <br />the Interior to "make reports as to the annual consumptive uses and losses <br />of water from the Colorado River System. . . starting on October 1, 1970. <br />Such reports shall include a detailed breakdown of the beneficial consumptive <br />use of water on a state-by-state basis." Additionally, this report is in <br />cOlnpliance with Section 49 of the Navajo Project Participation Agreement <br />dated September 30, 1969, which states in part: "The Secretary of the Interior <br />further agrees to make the reports required by Section 601(bX1) of Public <br />Law 90-537 as they pertain to Arizona's Upper Basin uses annually rather that <br />every five years. Within fifteen days following the completion of said reports, <br />the Secretary of the Interior shall furmsh copies of such reports to the Co- <br />Tenants, the Navajo Tribe, each of the Upper Basin States, and the Upper <br />Colorado River Commission." <br /> <br />SUMMARY <br /> <br />The total consumptive use and loss value for the Arizona portion of the Upper <br />Colorado River Basin for water year 1990 was 35,880 (:t1,850) acre-feet. <br /> <br />STUDY AREA DESCRIPTION <br /> <br />The Arizona portion of the Upper Colorado River Basin occupies the northeast <br />corner of Arizona and covers approximately 6,900 square miles, as shown on <br />the location map (Drawing 1246-406-1), conditions vary greatly from east to <br />west in the study area. <br /> <br />The climate of the 5,900-square-mile area to the west of the Chuska and <br />ClUTizo Mountains is largely arid to semiarid, with mean annual precipitation <br />ranging from 6 to 12 inches and with summertime temperatures often reaching <br />100 OF (degrees Fahrenheit). The potential evaporation rate is high and <br />exceeds mean annual precipitation, with gross lake evaporation values of up to <br />