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<br />. <br /> <br />, On:~354 <br /> <br />GLOSSARY OF WATER MANAGEMENT TERMS <br /> <br />AREA OF ORIGni--A definable area of the earth's surface receiving <br />precipitation resulting in runoff' capable of being developed for <br />beneficial. use. <br />Legal protection of an area of origin assures the population of <br />that area an equivalent amount of water at a cost no greater than that <br />which would have been required to develop this water had it not been <br />already developed and used elsewhere. <br /> <br />ARID--A term applied to regions where precipitation is so deficient <br />in quantity, or occurs at such times, that agriculture is impractical. <br />without irrigation. <br /> <br />ARTISIAN AQUIFER--An aquifer in which the water is under suff'icient <br />pressure to cause it to rise above the bottan of the confining bed if <br />opportunity to do so were prOVided. <br /> <br />ARTIFICIAL RECHARGE--The addition of water to the ground water reservoir <br />by activities of man, such as irrigation or induced infiltration fran <br />streams, wells, or l>preading basins. <br /> <br />ASPJ!lCT--The can pass direction toward which the land slope faces. The <br />direction is measured downslope and normal to the contours of <br />elevation. <br /> <br />ASSOCIATED COSTS--The costs of the goods and services, over and above <br />those included in project costs needed to make the immediate products <br />or services of the project available for use or sal.e. <br /> <br />AVERAGE ANNUAL COS!r--The equivalent of the project costs reduced to an <br />equivalent uniform annual cost by cam;pound interest methodS, and <br />includes interest and amortization on the investment, plus <br />replacements, operation, and maintenance of the project during its <br />econanic life. <br /> <br />AVERAGE Al'lNUAL DAMAGFS--The weighted average Of all damages that would <br />be expected to occur yearly under specified econanic conditions and <br />developnent. Such damages are canputed on the basis of the <br />expectancy in any one year of the a.mounts of damage that would <br />result fran events thr~out the full range of potential. magnitude. <br /> <br />AVERAGE ANNUAL ~UIVALENT DAMAGFS--Average annual damages over a specified <br />period of t:lme taking into account future changes in econanic <br />conditions and developnent by use of compound interest methods. <br /> <br />AVERAGE ANNUAL FLOOtl--See MEAN AromAL FLOOD. <br />AVERAGE ANNUAL PRECIPITM'ION--See MEAN AromAL PRECIPITM'ION. <br /> <br />. <br /> <br />AVERAGE ANNUAL YIELD--The average supply produced by a given water <br />developnent over a period of time. <br /> <br />3-A <br /> <br />