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I I I I I I I I I I I I I I I I I I I 37')~ '- dV Information developed during several of the more comprehensive investigations is utilized in each of the subbasin discussions. Water Resources of the upper Colorado River Basin - Technical Report (Professional Paper 441), published by the U. S. Geological Survey (USGS), is authored by W. V. Iorns, C. H. Hembree, and G. L. Oakland. This report contains an analysis of the influence of natural environmental factors and the activities of man on the occurrance, quantity, and quality of the Upper Colorado River Basin water resource. The authors of the report utilized streamflow and water quality measurements taken at USGS gaging stations during water years 1914-1957. Salt budgets were developed using data from stations above and below areas affected by the activities of man. Increases in dissolved solids above that which could be accounted for by inflow and natural contributions in these areas were considered to be the amount added to the system by the activities of man. An attempt to further define man caused sources was made by attributing a conservative figure of 100 tons of salt per 1,000 people per year to municipal and industrial use of water. That portion of man caused salt load not attributed to municipal and industrial sources was attributed to irrigated agriculture. Appendix A of the EPA's The Mineral Quality Problem in the Colorado River Basin also contains valuable salt loading information on Colorado subbasins. The report, released in 1971, is the result of short-term sampling programs and field investigations designed to further define and detail existing information on the location and magnitude of salt loading as well as fill in major gaps in existing water data. The studies were carried out from June of 1965 to May of 1966. -4-