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Page 4758, results 118926 - 118950

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Preliminary assessment of potential well yields and the potential for artificial recharge of the Elm and Middle James aquifers in the Aberdeen area, South Dakota
P.J. Emmons
1987, Water-Resources Investigations Report 87-4017
A complex hydrologic system exists in the glacial drift overlying the bedrock in the Aberdeen, South Dakota, area. The hydrologic system has been subdivided into three aquifers: the Elm, Middle James, and Deep James. These sand-and-gravel outwash aquifers generally are separated from each other by till or other fine-grained sediments....
Hydrologic and geologic factors affecting land subsidence near Eloy, Arizona
V.J. Epstein
1987, Water-Resources Investigations Report 87-4143
At an extensometer site near Eloy, Arizona, 1.09 m of land subsidence caused by groundwater withdrawal were measured by leveling in 1965-83. The extensometer, which partially penetrates the compressible sediments, recorded 0.82 m of compaction during the same period. By use of a one-dimensional model, cumulative daily compaction values were...
Relations of specific conductance to streamflow and selected water-quality characteristics of the Arkansas River basin, Colorado
Doug Cain
1987, Water-Resources Investigations Report 87-4041
Areal, seasonal, and long-term variations in the specific conductance of surface and groundwater in the Arkansas River basin of Colorado were evaluated and relations of specific conductance to stream-flow and to concentrations of dissolved solids and major ions were determined as part of an effort to develop a comprehensive hydrologic...
Seismicity map of the state of Georgia
B. Glen Reagor, C. W. Stover, S. T. Algermissen, L.T. Long
1987, Miscellaneous Field Studies Map 1060
This map is one of a series of seimicity maps produced by the U.S. Geological Survey that show earthquake data of individual states or groups of states at the scale of 1:1,000,000.  This map shows only those earthquakes with epicenters located within the boundaries of Georgia, even though earthquakes in...
Analysis of water-surface profiles in Leon County and the city of Tallahassee, Florida
M.A. Franklin, R.A. Orr
1987, Water-Resources Investigations Report 86-4327
Water surface profiles for the 10-, 25-, 50-, and 100-yr recurrence interval floods for most of the streams that drain developing areas of Leon County and the city of Tallahassee are presented. The principal streams studied are in the Lake Munson, Lake Lafayette, and Lake Jackson basins Peak discharges were...
Cross sections showing stratigraphic framework of upper Cretaceous Dakota Sandstone, Mancos Shale, Mesaverde Group, and Mesaverde Formation, and lower Tertiary Wasatch Formation, west-central Piceance Basin, Garfield County, Colorado
Margaret S. Ellis, B.S. Kelso
1987, Miscellaneous Field Studies Map 2008-A
Cross sections A-A' and B-B' show the stratigraphic framework of Upper Cretaceous rocks in part of the Piceance basin, northwestern Colorado.  This Laramide basin is asymmetric in shape and has a gently dipping western flank and a steeply dipping eastern flank.  The basin is bounded by the Uinta uplift to...
Definition of boundary and initial conditions in the analysis of saturated ground-water flow systems - An introduction
O. Lehn Franke, Thomas E. Reilly, Gordon D. Bennett
1987, Techniques of Water-Resources Investigations 03-B5
Accurate definition of boundary and initial conditions is an essential part of conceptualizing and modeling ground-water flow systems. This report describes the properties of the seven most common boundary conditions encountered in ground-water systems and discusses major aspects of their application. It also discusses the significance and specification of initial...
Mineralogy and instrumental neutron activation analysis of seven National Bureau of Standards and three Instituto de Pesquisas Tecnologicas clay reference samples
John W. Hosterman, F.J. Flanagan, Anne Bragg, M. W. Doughten, R.H. Filby, Catherine Grimm, J. S. Mee, P.J. Potts, N.W. Rogers
1987, Circular 957
The concentrations of 3 oxides and 29 elements in 7 National Bureau of Standards (NBS) and 3 Instituto de Pesquisas Techno16gicas (IPT) reference clay samples were etermined by instrumental neutron activation analysis. The analytical work was designed to test the homogeneity of constituents in three new NBS reference clays, NBS-97b,...
Surface-geophysical investigations in Melton Valley, Oak Ridge Reservation, Tennessee
Patrick Tucci
1987, Water-Resources Investigations Report 87-4184
Surface geophysical methods were found to be valuable for refining knowledge of the geohydrology of Melton Valley, an area used for burial of low-level radioactive waste at the Oak Ridge Reservation in Tennessee. The valley is characterized by locally complex geologic structures in lithologies of interbedded shale and limestone. Radionuclides...