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<br />SECCION IV - GEOHIDROLOGIA
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<br />of saltcedar. A comparison of thf: river and well records shows that the diurnal
<br />fluctuations are quite similar. The transpiration discharge by saltcedar caused
<br />not only a marked variation in the daily flow of the stream, but also a depletion
<br />in the flow of. the stream. The amount of depletion was estimated by assuming
<br />that the maximum observed rate of discharge represented the mean daily rate
<br />of discharge under conditions of no depletion. That is, . if there were no loss
<br />by transpiration, then the curve obtained by connecting the points of maximum
<br />discharge would apprpximate the probable flow of the stream, The difference
<br />between the actual and probable flow computed on this basis amounted to
<br />about 12.5 percent of the mean daily flow for the 8,day period. In other words,.
<br />the effects of transpiration on the flow of the stream at this station was to
<br />reduce it by about one eighth.
<br />The Green River in its .437,mile COUrse, through Colorado and Utah, passes
<br />through several valleys where the stream is bordered by flood plains totaling
<br />about 4'0,000 acres in area, much of it covered with phreatophytes. The average
<br />flow entering this reach during a 21.day period in September 1948, includ.
<br />ing tributary inflow and,ground-water seepage, was 1,4'06 cubic feet per second
<br />(cfs) and that leaving it was 974. The evapotranspiration discarge from the
<br />flood plains during this period was estimated to be 278 cfs; that from the
<br />water surface, 154 cfs (Thomas, 1952, p,2B). Assuming that this rate continued
<br />for the entire month, the evapotranspiration discharge from the flood .plains
<br />during the month was about 16,500 acre feet, The flood plain of the Pecos
<br />River in New Mexico is covere dahnost' entirely with a dense growth of salt-.
<br />cedars. It is estimated that the area covered is between 35,000 and 40,000
<br />acres and that these plants may consume as much as 2'0'0,'000 -acre-feet of
<br />water annually. >
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<br />CONSUMPTIVE USE AND CONSUMPTIVE WASTE
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<br />In dealing with the water used by plant life, the term "consumptive use~'
<br />has come into general use to denote the quantity of water evaporated or trans-
<br />pired from any area. It is considered synonymous with the term total evapo-
<br />transpiration. The term consumptive use makes no distinction as to the nature
<br />of use, but includes the water used by cultivated crops necessary for man's
<br />existence as well as that used by plant lige that benefits him little or none at
<br />all. In order to distinguish between these conditions of use, the water used
<br />in the growing of crops, or other vegetation of high economic value, is refer-
<br />red to as bene:ficial consumptive use, and that used ,by weeds and noxious plants
<br />is designated nonbeneficial consumptive use.
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