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<br />tv <br />CD <br />00 <br />~?1 <br /> <br />i, ~ <br /> <br />v <br /> <br /> <br />ABSTRACT <br /> <br />A summary of the results of applied research on salinity <br />control of irrigation return flows in the Grand Valley of <br />Colorado is presented for the period of 1969 to 1976. Salinity <br />and economic impacts are described for the Grand Valley Salinity <br />Control Demonstration Project which contains approxima~ely 1,600 <br />hectares and involves most of the local irrigation companies in <br />the Valley. During the eight years of studies in the project <br />area, 12.2 Km of canals were lined, 26.54 km of laterals were <br />lined, 16,400 meters of drainage tile were installed, a wide <br />variety of on-farm improvements were constructed, and an irri- <br />gation scheduling program was implemented. On-farm improvements <br />evaluated were solid-set sprinklers, side-roll sprinklers, drip <br />(trickle) irrigation, furrow irrigation, and automatic cut-back <br />furrow irrigation. The total value of the constructed improve- <br />ments in the demonstration area was about $750,000. The total <br />improvements resulted in a salt reduction of 12,300 metric tons <br />per year reaching the Colorado River. This salt reduction results <br />in an annual benefit to downstream water users of nearly <br />$2,000,000. In addition, there are benefits to the local water <br />users with increased crop yields, and to the people of Grand <br />Valley in increased business. <br /> <br />This report was submitted in fulfillment of Grant No. <br />S-802985 by the Agricultural and Chemical Engineering Department <br />of Colorado State University under the sponsorship of the <br />Robert S. Kerr Environmental Research Laboratory, U.S. Environ- <br />mental Protection Agency. This report covers the period <br />February l8, 1974 to February 17, 1977. <br />