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Geology of the White Pine District
No full textThe White Pine district of Nevada is about 30 miles east of Eureka, midway between eureka and Ely, and includes approximately 270 square miles. the area comprises essentially the southeast quarter of the Seligman No. 1 quadrangle, the southwest quarter of the Illipah No. 2 quadrangle, the northwest quarter of the Treasure Hill quadrangle, and the northeast quarter of the Mount Hamilton quadrangle in T. 15, 16, 17, N., and R. 57, 58 E., M.D.B. and M.
The original purpose of the geological work, done under the direction of the Nevada Bureau of Mines, was to prepare a map of the area around Hamilton and Pogonip Ridge in relation to the mineral deposits there. Various companies became interested in the petroleum possibilities of Eastern Nevada in 1947 and accordingly it was decided to expand the work to include more of the Upper Paleozoic rocks in the vicinity. The author spent most of the summers of 1946, 1947, 1948, and 1949 working on this project
Escrow instructions to the First National Bank of Nevada regarding the transfer of Las Vegas water production from the Union Pacific Railroad to the Las Vegas Valley Water District, June 21, 1954
No full textEscrow instructions for the transfer of Las Vegas water production from the Union Pacific Railroad to the Las Vegas Valley Water District. Contract between the Los Angeles & Salt Lake Railroad, the Union Pacific Railroad, and the Las Vegas Land and Water Company
Geological survey circular 346: First fourteen years of Lake Mead
No full textThis circular summarizes the results of recent studies of Lake Mead and its environs. Area-capacity tables, prepared on the basis of a hydrographic survey of the lake in 1948-49, show that the capacity of the reservoir was reduced 4. 9 percent during the first 14 years after Hoover Dam was completed, but the usable capacity was reduced only 3.2 percent. Practically all of this reduction was caused by accumulation of sediment in the reservoir. Studies of inflow and outflow indicate that the reservoir has a total storage capacity about 12 percent greater than that shown by the area-capacity table, because of bank storage, or ground-water storage in the bottom and sides of the reservoir. Thus the total capacity in 1949 was greater than the quantity shown by the original area-capacity table, even though large quantities of sediment had been deposited in the reservoir during the 14 years.
According to computations of the volume and weight of the accumulated sediment, about 2, 000 million tons were deposited in the reservoir by the Colorado River in 14 years; this is within 2 percent of the amount calculated from measurements of the suspended sediment carried by the inflowing rivers. It is estimated that the sediment capacity of the reservoir, when filled to the level of the permanent spillway crest, is about 75, 000 million tons. The sediment contributed by the Colorado River averages about 45 percent sand and 55 per-cent silt and clay.
If the sediment carried by the river in the years 1926-50 represents the long-term average rate of accumulation in Lake Mead, it will be a century before the sediment at the dam reaches the level of the lowest gates in the intake towers, and more than 4 centuries before the reservoir is filled with sediment to the level of the permanent spillway crest. The rate of sedimentation since the first year of Lake Mead (1935) has been about 20 percent lower, and if that rate continues in the future, the life of the reservoir will be correspondingly greater. Construction of upstream reservoirs to capture some of the inflowing sediment, or transportation of sediment in the outflow through Hoover Dam, would also increase the life of the reservoir.
In the first 12 years of Lake Mead, the dissolved mineral matter in the outflowing water was significantly greater than the average in the inflowing water, owing in part to solution of gypsum and rock salt from the bed of the reservoir. Currently the increased dissolved solids in the outflowing water can be accounted for almost entirely by evaporation from the reservoir, which is about 5 to 7 percent of the annual inflow. The water from Lake Mead is habitually of better quality than that diverted from the river for irrigation prior to regulation by Hoover Dam, because it represents an average of the poor water of low stages and the excellent water from melting snow.
Geodetic surveys of the Lake Mead area show that the weight of water has caused subsidence of the earth\u27s crust amounting to about 120 millimeter at Hoover Dam, and an even greater amount in the principal area of storage in the reservoir
Water levels and artesian pressure in wells in Las Vegas Valley and in other valleys in Nevada, 1913-1945
No full textThe rock formations of the earth are great natural reservoirs in which a part of the water derived from rain and snow is stored. Water levels and artesian pressure in wells register the stages of these natural reservoirs. The changes in water levels or artesian pressure are indicative of the depletion or replenishment of the natural reservoirs. Systematic and periodic measurements of water levels and artesian pressure in wells have been made in Nevada, by State and Federal agencies from time to time. However, only a few of these measurements have ever been published. Under the cooperative arrangement between the State Engineer of Nevada and the Director of the U.S. Geological Survey, Department of the Interior, beginning in July 1944, a considerable effort was made to assemble and compile the authentic available records of measurements for publication. Such a compilation provides a permanent record, readily available, for future reference. The result of this compilation is set forth in this report. It is the third in the series of Nevada Water Resources Bulletins prepared by the U. S. Department of Interior, Geological Survey, in cooperation with the State Engineer
Progress report on the ground-water resources of the Las Vegas Artesian Basin, Nevada
No full textWhether the tremendously increased population acquired by Las Vegas in the years 1940 to 1942 will be retained cannot at present be foretold. However, the valley will undoubtedly be expected to support a considerably larger population than it did at any time prior to 1940, and continually increasing demands on the water supply for innumerable pcacetimc activities must be anticipated. Therefore, a sound evaluation of tho ground water resources of Las Vegas Valley is directly in line with the other wisely progressive planning programs which are now operating or are taking shape in the valley as well as in the entire State of Nevada
Annual report of the Department of Irrigation, fiscal year 1926-27
No full textStudy of underground water in the Las Vegas Valley and the drainage of irrigated land in the Moapa Valley. F. L. Bixby was Senior Irrigation Engineer of the Irrigation Division of the Government Bureau of Public Roads
Cancer Facts and Figures for Hispanics/Latinos 2015-2017
No full textThis report summarizes statistics on cancer incidence, mortality, survival, risk factors, and early detection and screening for Hispanics in the US. It is intended to provide information to community leaders, public health and health care workers, and others interested in cancer prevention, early detection, and treatment for Hispanics. It is important to note that most cancer data in the US are reported for Hispanics as an aggregate group, masking important differences between Hispanic subpopulations according to nativity status (i.e., those who are foreign born versus those who are US born), degree of acculturation, and country of origin. For example, one study found that US cancer death rates in Mexicans are 12% lower than those in mainland Puerto Ricans