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<br />. <br />. <br />. <br />I <br />I <br />. <br />t <br />. <br />I <br />I <br />. <br />. <br />I <br />I <br />J <br />J <br />J <br />I <br />I <br /> <br />3742 <br /> <br />USGS <br /> <br />Man Caused <br />Natural <br />Man Caused <br />Natural <br /> <br />15.3% <br />84.7% <br />11.4% <br />88.6% <br /> <br />EPA <br /> <br />Although the total salt yields "and natural-man caused <br />breakdowns were close, the EPA study accounted for more of the <br />naturally caused salt load by attributing it to diffuse runoff. <br />The USGS attributed about 23,000 tons per year more to mineral <br />springs in the basin than did the EPA. <br /> <br />The EPA study developed consistently lower salt yields <br />(tons/acre) from irrigated agriculture which caused this <br />basinwide estimate of irrigation related salt loading to be <br />approximately 23,000 tons per year less than that of the USGS. <br /> <br />The USGS-BLM estimate of ground water contribution to total <br />basin salt yield was 160,000 tons per year. At 39%, ground water <br />contribution to total salt yield was lower in the Yampa River <br />Basin than any other subbasin in this inventory. <br /> <br />The fact that no Salinity Control Units (Colorado River <br />Water Quality Improvement Program) have been identified in this <br />basin has limited BuRec and SCS involvement in salt loading <br />investigations. <br /> <br />WHITE SUBBASIN <br /> <br />The White River Basin in Colorado encompasses 3,808 square <br />miles in the west-central part of the state between the Colorado <br />River Basin to the south and the Yampa River Basin to the north. <br />Elevations range from 5,000 to 12,000 feet above sea level. The <br />total basin population in 1980 was 6,300. <br /> <br />-10- <br />