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<br />o <br />c..) <br />W <br />N <br />c) <br />UI <br /> <br />16 <br /> <br />3.7 million acre.feet in 1983, and <br />4.2 million acre.feet in 1985. The <br />average for 1981.$6 was about <br />4.4 million acre.feet. <br /> <br />Significant ground.water usage occurs in <br />Ari2ona, Nevada, jmd New Mexico. For <br />the purpose of this report, ground.water <br />overdraft has not been taken into <br />account in the co~putation of tributary <br />consumptive use. Also, tributary <br />channel loss and s:alvage were not <br />evaluated. However, it should be noted <br />that present groUI\d-water overdraft in <br />Ari20na has been estimated to be <br />, approximately 2.2 'million acre-feet per <br />year. <br /> <br />Consumptive use for the irrigation of <br />crops represents between 73 and <br />81 percent of the Wtal water use in the <br />Lower Colorado tributary areas. <br />Estimated annual Consumptive use for <br />the Lower Basin d~g the 5-year <br />period average aoout 3.2 acre-feet per <br />acre, varying from iapproximately, <br />1.1 acre.feet per aqre in parts of New <br />Mexico to over 5 a4re-feet in the western <br />portion of the basil?, Estimated crop <br /> <br />consumptive USe varied considerably <br />from year to year on the basis of <br />climatic conditions,and acreagll <br />fluctuations, from a high of 4.3 million <br />acre-feet in 1981 to a low of2.7 million <br />acre-feet in 1983. Irrigated lands <br />amounted to about 1.47 million acres in <br />1981 but had decreased to about <br />980,000 acres in 1983. The decrease in <br />irrigated acreage occurred primarily in <br />the Gila River tributary, according to <br />State agriculture statistics. <br /> <br />The consumptive use of water for <br />municipal and industrial purposes is <br />estimated to have increased by about <br />44 percent for 1985 when compared with <br />, the ending year of the previous, <br />reporting period. Nearly 60 percent of <br />the increase occurred in 1981. <br /> <br />Water supply conditions were char. <br />acterized by near normal ,runoff in 1981, <br />exceptionally poor runoff in 1982, and <br />extremely large runoff in 1983, 1984, <br />and 1985. In addition, the runoffin <br />1985 produced an outflow below Painted <br />Rock Dam of 2,385,000 acre-feet. <br />