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Page 1181, results 29501 - 29525

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Publication Extents

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Relation of precipitation to annual ground-water recharge in the Edwards Aquifer, San Antonio area, Texas
Celso Puente
1975, Open-File Report 75-298
Annual recharge data obtained from historical records and mean-annual precipitation data computed from rainfall records were used to develop simple linear-regression equations for use in estimating annual recharge for seven subbasins in the San Antonio area. Adjustments were made to the precipitation parameter to account for the effects of year-end...
Sediment characteristics of streams in the eastern Piedmont and western Coastal Plain regions of North Carolina
Clyde E. Simmons
1975, Open-File Report 75-291
The sediment-transport characteristics of streams were determined in a 6,000-square-mile (15,500-square-kilometre) area of the Coastal Plain and Piedmont regions of eastern North Carolina during 1969-73. The study covered all or parts of 21 counties and included data for 28 sediment-sampling stations located in parts of 4 major river basins, the...
A general outline of the water resources of the Toppenish Creek basin, Yakima Indian Reservation, Washington
Dean O. Gregg, Leslie Bostwick Laird
1975, Open-File Report 75-19
Increasing demands for water supplies, plans for irrigating new lands, proposals to divert water from the Yakima River by users downstream from the reservation, and ground-water problems have made an accounting of the overall availability of water very important to water management on the reservation. This report, which broadly outlines...
An appraisal of groundwater for irrigation in the Appleton area, west-central Minnesota
Steven J. Larson
1975, Open-File Report 75-32
Supplemental irrigation of well-drained sandy soils has prompted an evaluation of ground water in the Appleton area. Glacial drift aquifers are the largest source of ground water. The surficial outwash sand and gravel is the most readily available and a really extensive drift aquifer and underlies much of the sandy...
Numerical model of the salt-wedge reach of the Duwamish River estuary, King County, Washington
Edmund A. Prych, W.L. Haushild, J.D. Stoner
1975, Open-File Report 75-13
A numerical model of a salt-wedge estuary developed by Fischer has been expanded and used to calculate the distributions of salinity, temperature, chlorophyll a concentrations, biochemical oxygen demand, and dissolved-oxygen concentrations in the Duwamish River estuary, King County, Wash. With this model, which was calibrated and verified with observed data,...
Age and tectonic significance of volcanic rocks on St. Matthew Island, Bering Sea, Alaska
William Wallace Patton Jr., Marvin A. Lanphere, Thomas P. Miller, Richard A. Scott
1975, Open-File Report 75-150
Reconnaissance investigations of the heretofore little known volcanic assemblage on St. Matthew Island provide significant information on the tectonic history of the Bering Sea shelf. St. Matthew Island is made up of approximately 500 m of subaerial calc-alkaline volcanic rocks ranging in composition from high-alumina basalt to rhyolite. Four K-Ar...
Sources of emergency water supplies in San Mateo County, California
P.R. Wood
1975, Open-File Report 75-43
San Mateo County has several densely populated urban areas that get most of their water supplies from surface-water sources that could by damaged by a major earthquake or other general disaster. In the event of such a disaster, limited supplies of potable water may be obtained from selected wells, springs,...
Titanium deposits in alkalic igneous rocks
Norman Herz
1975, Open-File Report 75-35
Many types of alkalic rocks are enriched in Ti02 relative to the average for the crust. Silicate minerals in these rocks may have high Ti02 contents, but the oxides ilmenite, rutile, brookite, and perovskite are also characteristic primary phases. These tend to be higher in niobium than are the same...