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Page 4789, results 119701 - 119725

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Modifications and corrections to the finite-difference model for simulation of three-dimensional ground-water flow
L.J. Torak
1982, Water-Resources Investigations Report 82-4025
This report describes modifications incorporated into the finite-difference model for simulation of groundwater flow in three dimensions. These modifications extend the application of this model to simulations involving head-dependent sources and sinks (i.e., rivers, evapotranspiration, and springs or drains). Other modifications are made that enhance the iterative-solution process of the...
Reconnaissance investigations of ancient gold mines in the southern part of the Wadi Bidah District, Jabal Ibrahim and Al Aqiq quadrangles, Kingdom of Saudi Arabia
R. G. Worl, C. W. Smith
1982, Open-File Report 82-789
Ancient gold mines in the southern part of the Wadi Bidah district, Kingdom of Saudi Arabia, are located either within lenses of ferruginous chert or in large felsic intrusions of Precambrian age. All are associated with quartz veins, stringers, and stockworks. Samples from both types of deposits have low silver...
Reconnaissance geologic map and mineral resource potential of the Gearhart Mountain Wilderness and Roadless Area (6225), Lake and Klamath counties, Oregon
George W. Walker, James Ridenour
1982, Miscellaneous Field Studies Map 1367
The Gearhart Mountain Wilderness, Lake and Klamath Counties, Oreg., is devoid of mines and mineral prospects and there are no known mining claims within the area. Furthermore, the results of this mineral appraisal indicate that there is little likelihood that commercial deposits of metallic minerals will be found in the...
Dissolved-solids concentrations of ground water in the Sacramento Valley, California
Ronald P. Fogelman
1982, Hydrologic Atlas 645
The general quality of the ground water in the Sacramento Valley , Calif., in terms of dissolved-solids concentration is considered good for irrigation, domestic, and most other uses. This map shows the distribution of dissolved-solids concentrations and is based on about 1,330 chemical analyses collected from about 900 wells between...
Water-data program of the U.S. Geological Survey
Bruce K. Gilbert, Thomas J. Buchanan
1982, Circular 863
The U.S. Geological Survey is the principal Federal agency responsible for the collection of hydrologic data needed for the planning, development, use, and management of the Nation 's water resources. These data are the foundation necessary for conducting analytical and interpretive appraisals describing the occurrence and availability of surface and...
Aliphatic Hydrocarbons in Surface Sediments of Willapa Bay and Grays Harbor, Washington
J. B. Rapp, K.A. Kvenvolden, H.E. Clifton
1982, Open-File Report 82-609
Willapa Bay and Grays Harbor are two adjacent estuaries along the coast of Washington state. Willapa Bay is a recreational area minimally affected by industry; Grays Harbor, on the other hand, is moderately industrialized. Aliphatic hydrocarbons in surface sediments from these two estuaries reflect the differences in human activities. For...
Surface displacement on the Imperial and Superstition Hills faults triggered by the Westmorland, California, earthquake of 26 April 1981
R. V. Sharp, J. J. Lienkaemper, M. J. Rymer
1982, Open-File Report 82-282
Parts of the Imperial and the Superstition Hills faults moved right-laterally at the ground surface at the time of or shortly following the ML 5.6 Westmorland earthquake of 26 April 1981. The displacements occurred prior to any significant aftershocks on either fault and thus are classed as sympathetic. Although the...
Habitat Suitability Index Models: Southern kingfish
Walter B. Sikora, Jean Pantell Sikora
1982, FWS/OBS 82/10.31
The habitat use information and habitat suitability index (HSI) models in this report on southern kingfish are intended for use in impact assessment and habitat management. The models were developed from a review and synthesis of existing information and are scaled to produce an index of habitat suitability between 0...