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<br /> <br />o <br />c.n <br />'"'-l <br />Co:> <br /> <br />COLORADO WATER CONSERVATION BOARD <br />215 State Services Building <br />1525 S~erman Street <br />Denver 3, Colorado <br /> <br />., <br /> <br />May 13, 1963 <br /> <br />~ ~ M Q BAli ~ U M <br /> <br />TO: <br /> <br />L. R. Kuiper, Acting Director. <br /> <br />FROM: <br /> <br />Richard H. Pearl, Jr. Resource Engineer. <br /> <br />SUBJECT: <br /> <br />. Quality of Colorado River. W""ter, Cameo, Colorado,. <br />.to Ciaco,. Utah. <br /> <br />In 1963 the United States Geological Survey and Bureau <br />of Reclamation jointly published a report titled Qualitv of Water <br />Upper Colorado River Basin. On page 40 the Geological Survey stated <br />that as a result of irrigation, an average of 5.6 tons of dissolved <br />solids per acre per year are added to the Colorado River as a result <br />of irrigation below Plateau Cr. nr.Cameo, Colorado, the Gunnison <br />River at Grand Junction, Colorado, and above the Dolores River nr. <br />Cisco, Utah. As there was some question of this est~ate, a study <br />was undertaken to check its accuracy. <br /> <br />I <br />I' <br />. , <br />I, <br />I. <br /> <br />Pive separate studies were made, with each succeeding <br />study being a refinement of the preceeding one. From these studies, <br />it is believed that study No. one, the last one made. is the most <br />accurate and reflects historic and present day conditions. <br /> <br />PROCBDURBS <br /> <br />1). The U. S. Geological Survey study encompassed the period <br />1914-1957. Prior to 1951 only fragmentary Quality of Water records <br />had been kept for one or two statiors in this reach of the Colorado <br />River. ~erefore, it was decided to use the periOd 1951-1957 and <br />adjust the result to the 1914-1957 period for comparison with the <br />Geological Surveys result. <br /> <br />2). In order to show the effect of increased salt content <br />of the Colorado River by irriqation, a.monthly inflow-outflow study <br />was made which took into consideration any aeretions which might <br />have been due to municipal and precipitation causes. <br />