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<br /> <br />- <br /> <br />w <br />w <br />o <br />'" <br /> <br />in developin~ a simulation model of the hydrologic and salinity <br /> <br />flow systeMs of the Upper Colorado River Basin. Estimates were <br /> <br />derived based on the 1931-1960 period and reflect cropping and <br /> <br />riverflow regulation conditions as of 1960. The estimated salt <br /> <br />load at l.ees Ferry was 8.6 million tons per year of which approx- <br /> <br />inately 4.3 million tons originated from natural sources, 1.5 mil- <br /> <br />lion tons from within the agricultural system, and 2.8 million tons <br /> <br />from other inputs to the system; thus. natural sources are thought <br /> <br />to contribute SO percent of the salt load, agricultural sources <br /> <br />17 percent. and unidentified sources 33 percent. The report states <br /> <br />that the agricultural salt load and cropland consl~rtivc use <br /> <br />increase the total dissolved solids concentration within the Upper <br /> <br />Basin by 104 and 113 mgjl. respectively. The model was designed <br /> <br />to predict the effects of various possible water resource manage. <br /> <br />ment alternatives. <br /> <br />Salinity of Surface Water in the Lower Colorado River- <br /> <br /> <br />Salton Sea Area (USGS) <br /> <br />U.S. Geological Survey Professional Paper 486-r. entitled "Salinity <br /> <br />of Surface I\'ater in the LOb'er Colorado River.Salton Sea Area." was <br /> <br />published in 19i1. The report sholoo's that during the period 1926- <br /> <br />1962. the chemical re~inen of the Colorado River at Grand Canyon <br /> <br />and upstream. although probably someloo'hat different fro~ the virgin <br /> <br />regimen, was relatively stable. There may. however. have been <br /> <br />17 <br /> <br />