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<br /> <br />~ <br /> <br />" 'J <br /> <br />year. Occasionally one finds a crystal of salt clinging to the end of <br />a needle but that is all. It is evident that nature takes from the soH <br />just what moistu1'e she needs to produce the growth required and some <br />transpiration takes place. at least during the daytime. <br /> <br />,',) <br /> <br />fJ' <br />""" <br />"""" <br /> <br />The table shows the consumptive use estimated by the El1gineering <br />Council' for the Upper Colorado Basin. to have taken place by m~."'~ . <br />activity. in the Colorado River Basin in Colorado. (Table attached.p~ 4) <br /> <br />Attent_ &8 mU-d -tGI .llhe:.l:n4. .fDZ1IXIIm......~e.il 'll<CI:t'<aS iim Cmlorado with' <br />an esUnlated consumptive use of 178. 66Z acre feet. <br /> <br />~; <br /> <br />T~e me~ who made the classification of lands on the Westel"n Slope I' <br />were \UU,1ble to l40ntify these 106. 8lZ acres of incidenta11ands. They <br />stated that it they were under any canal system they we:re classed as <br />irdgate<l. That being the case. it appea:rs they have been figured twice, <br />.. the B~..u put that acreage under "i:rrigated". <br /> <br />( K <br /> <br />EFFECT OF MAN'S ACTIVITIES ON RUN-OFF IN <br />THE UPPER COLORADO RIVER BASIN OTHER <br />THAN BY IRRIGATION <br /> <br />D.d\\C~g the 178. 66Z ac:re feet consumptive use f:rom the 1,062.753. ' <br />~.r. is left 884. 091 acre feet which the Engineering Committee con_ <br />toocl. is entirely lo.t to the Colo:rado River Basin in Colorado each <br />yOU. Whuc did it go? (Man cannot dest:roy water.) <br /> <br />AssumlatS that the Enginee:ring Advisory Committee is correct in <br />stating that man, in dive:rting water for irrigation in the Colo2:'ado <br />RIveI' B_sin, has caused an .average of D84. 091 acre feet to blowout . <br />of the Basin annually. thus reducing the stream flow by that amount, <br />they mu.. then, in all fairness. consider what effect man's other act!- <br />vtstes in the Basin has had on stream flow, such as overgrazing of <br />na.ticapy aU the range land and forest lands, denudingcerta~n areas <br />of Umbe~ by cutting. by fire. spread of destructive insects and de", <br />,"uetion .f beaver dams. <br /> <br />J:a order to arrive at some figure that might be representative of the <br />l.ft'l'ea8e in stream flow due to these activities. a study was made of <br />ahe ..v.ioal experiments that have been conducted by the Government <br />to determine their amount. . <br /> <br />MAN'S EFFECT ON FOREST AREA RUN~OFFS <br /> <br />Tho U, S. Forest Service is ca:rrying out expe:rlments on a forest area <br />Oil. tile I'M8.1' River. a t:ributary of the Colo:rado, near Fraser, Coloradoo <br /> <br />-3. <br />