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<br />0012b3 <br />. . <br /> <br />investigators point out that the cost of water saved by evapora- <br /> <br />tion suppression in a full-scale program under favorable con- <br /> <br />ditions might be as low as ~20-~35 per acre foot. <br /> <br />The U. S Geological Survey with the cooperation of Esso <br /> <br />Research Laboratories is experimenting with the asphaltic treat- <br /> <br />ment of a watershed at White Sands Proving Ground to increase <br /> <br />water yield. <br /> <br />In one series of tests 59 per cent of 5.1 inches <br /> <br />of rain, or 2.3 acre-feet, was yielded as run-off from a nine <br /> <br />acre treated watershed as compared to two per cent, or 0.08 <br /> <br />acre-feet, from an adjacent similar but untreated watershed. <br /> <br />Since the surface must be ~reated occasionally indications <br /> <br />are that the cost of this increased yield will be high. Also, <br /> <br />widespread application of this technique could adversely affect <br /> <br />the grazing economy and might be esthetically objectionable. <br /> <br />H",wever. the tec'hnique may prove useful for some localized and <br /> <br />difficult problems. <br /> <br />One of the five demonstration plants for the conversion <br /> <br />of saline and brackish waters authorized by Public Law 85-883 <br /> <br />is located at Roswell, New Mexico. New Mexico has a relative <br /> <br />alundance of saline and brackish waters and the conversion <br /> <br />of these supplies may be the answer to some of our municipal <br /> <br />and industrial water supply problems in the future. The State <br /> <br />of New Mexico contributed ~lOO,OOO to the construction costs <br /> <br />11 <br />