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. . . ~.... ~ w co SPECIAL STUDIES (continued) A more recent report funded by the Water and Power Resources Service entitled "A Mathematical Model of Primary productivity and Limnological Patterns in Lake Mead, Technical Report No. 13," September 1972, analyzes the biological and chemical properties of Lake Mead based on eight sampling stations. This report indicates the SOurces of water pollution and the time of highest pollution potential. It also presents a method of quanti- fying eutrophication trends in Lake Mead. Another report entitled "Final Report on Interrelationships between Chemical, Physical, and Biological Conditions of the Waters at Las Vegas Bay at Lake Mead" by Dr. James Deacon, University of Nevada, Las Vegas, May 1973, describes the effects of Las Vegas Wash, an enriched stream on Lake Mead. The Biology Department of the University of Nevada, Las Vegas, con- ducted a special study called the "Lake Mead Water Quali ty Monitoring Program." A report on this program was issued in April 1975. Complete chemical and nutrient analyses are made for water samples taken by the Water and Power Resources Service quarterly at three stations in Lake Mead: Hoover Dam Intake Towers, Saddle Island Station, and Sta- tion 10. The California Department of Fish and Game just completed a limno- logical study of the Lower Colorado River from Needles, California, to the Northerly International Boundary. The report was completed in 1978. The University of Nevada at Las Vegas completed a 2-year limnological study on Lake Mead in December of 1978. The report includes information on the nutrient problems which will probably be associated witb the Hoover Modification program.(30) D. Upper Colorado River Salinity Investigations Water quality samples are being collected daily, monthly, or quarterly from approximately 100 sites on the rivers, canals, drains, and sloughs by the Water and Power Resources Service, and by the Geological Survey for the Water and Power Resources Service in the Upper Colorado River Basin. This program is in addition to tbe regular Geological Survey network. Samples are collected at various locations for the purpose of evaluating effects of future water resource projects on the river system, identifying sources of salinity for water quality improvement projects, obtaining basic data for research projects, and acquiring long-term records to determine trends and observe overall changes in the salinity of the river system. This moni- toring system will be especially valuable in providing data for tbe Colo- rado River Water Quality Improvement Program. 101