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<br />001375 <br /> <br />GLOSSARY OF WATER MANAGEME:NT TERM3 <br /> <br />MACROCLJNATE--The general large-scale climate of a large area or <br />country as distinguished from mesoclimate and microclimate. <br /> <br />MAXlMIZATION OF }lET BENEFITS--Net benefits are maximized when the scope <br />of developnent is extended to the point where the benefits added <br />by the last increment of scale (i. e., an increment of size of a unit, <br />an individual purpose in a multiple purpose plan, or a unit in a <br />canprehensive plan) are equal to the cost of adding that increment <br />of scale. <br /> <br />MEAN ANNUAL FLOOD--The average of all the annual flood stages or discharges <br />of record, or a value found by regionalization, correlation, or sane <br />other process that is believed to furnish a better estimate of the <br />long-tenn average than is provided by observed data. Some investigators <br />arbitrarily define the mean annual flood as the stage or discharge <br />having a recurrence interval of 2.33 years. <br /> <br />MEAN ANNUAL PRECIPITATION--The average of all annual precipitation values <br />known, or an estimated equivalent value derived by such methods <br />as regional indexes or isohyetal maps. <br /> <br />MEAN ANNUAL RUNOFF--The average value of all annual runoff amounts <br />usually estimated fran the period of record or during a specified <br />base period fran a specified area. <br /> <br />MEDIAN--A value in a statistical (ordered) array having as many cases <br />larger in value as cases smaller in value. <br /> <br />MESOCLJMA.TE--The climate of small areas of the earth's surface which , <br />may not be representative of the general climate of the region. <br />It is intennediate in scale between macroclimate and microclimate. <br />Places considered inmesoclimatOlogy include small valleys, "frost <br />hollOWs," forest clearings, and open spl.ces in towns. <br /> <br />MESOPHY'l'E--A plant that grows under medium or usual conditions of <br />atmospheric moisture supply as distinguished from one which grows <br />under dry or desert conditions (xerophytes) or very wet conditions <br />(hydrophytes) . <br /> <br />MICROCLJNATE--The local ciimatic conditions, brought about by the <br />modification of general climatic conditions by local differences in <br />elevation and exposure. The detailed area of a very small area <br />of the earth's surface. <br /> <br />MILLIGRAMS PER Ll'l'ER--See ppn. <br /> <br />l-M <br /> <br />