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local agencies. Results are summarized in "Use of Water by Native Vegetation," State Bulletin No. 50, and "Irr~gation Requirements of Californillo Crop.s," State BUlletin No. 5L A ,report on flConsumptive Water Use and Requirements in the C.olorado River Area of Utah," pub- lished by the Utah State Agri~ultural College in Mar~h 1953, presents results of. a study by the Division of Irrigation Engineering and Water Conservation, the Utah State ~ngineer ,and' the Utah Agricultural Experi- ment Station. Methods used to determine consumptive use were (a) soil moisture depletion, (b) tank or lysimeter for, unit values, (c) inflow-out- flow and. (d) integration for larger valley areas, Unit rates determined by this study are recommended for use in the Utah portionof the Colorado River Basin. Estimates of Consumptive Use In Colorado River Basin Because of the few measurements in the Colorado River Basin, rates of water use were computed by the empirical formula (U . KF). In 1948, at the request of the Upper Colorado River Compact Commis- sion, representing Arizona, Colorado, New, Mexico, Utah. and Wyoming . and the, Federal Government, study was made of water consumption by crops and native vegetation in the Upper Basin, and a report on consump- tive-userates for 56 areas was submitted. Similar estimates on a statewide basis were pubUshed in these provisional reports: "Consump- tive Use and Irrigation Requirements of Crops in Colorado", "Consumptive Use and Irrigation Water Requirements of <;::rops in New Mexico"; "Con- sumptive Use of Water and Irrigation Requi,rements of Crops in UtahH; and "Estimate of Water Requirements of Ctops in .Wyoming". In 1952, at the request of a Technical Committee representing the Bureau of Reclamation, Bureau of Indian Affairs, Navajo Tribal Council, and the Interstate Engineer of New Mexico, special investigation in the San Juan Basi.n waS reported upon: "Irrigation Water Requirements of Crops in the Shiprockand South San Juan Projects in New Mexic.o". During 1951-52, at the request of the Bureau of Reclamation, study was made. and reported upon as "Consump~ive Use of Water Rates in the Lower Colorado River Basin". Estimates; of unit consumptive use by crops are based primarily on the me;l.sure;ments made in satt River Valley, Arizona. Estimates of water con$umption by native vegetation are based mostly on observations by the U:. S. Geological Survey in Safford Valley, Arizona. These data were transferred to other areas of the Lower Basin through relationships established empirically between measured consumptive use and climatological data. In 1950, a report, "Consumptive Use of Irrigation Water by Crops in Nevada" was prepared in coope1"ation with the Nevada Agricultural Ex,periment Station. Pre- liminary study is being made in coope1"atipn with the State Engineer,on consumptive use of water rates by irrigat;ed lands in the Colorado River 'Basin of Nevada. ': In June 1953 a p1'ovisional. report, "Estimates of Evaporation from Salton Sea, California" was prepared at the request of the California Division of Water Resources, summarizing results of early pan measure- ments and e.stimates. Average estimateljl of annual evaporation .by previous investigator s range fromM. 8 inches for: 1907 -13 to 73.7 inches in 1907 -08. P,~eliminary estimates for the5-year pe*iod 1948 to 1952, based on studies by -14- . ... . . " .