Robert A. Crovelli, Richard H. Balay
1987, Open-File Report 87-414-A
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Page 1454, results 36326 - 36350
Publication Extents
Not all publications have extents, not all extents are completely accurateO. Lehn Franke, Thomas E. Reilly
1987, Water Supply Paper 2315
The most critical and difficult aspect of defining a groundwater system or problem for conceptual analysis or numerical simulation is the selection of boundary conditions . This report demonstrates the effects of different boundary conditions on the steady-state response of otherwise similar ground-water systems to a pumping stress. Three series...
Carl R. Goodwin
1987, Water Supply Paper 2282
Tampa Bay, Florida, underwent extensive physical changes between 1880 and 1972 because of construction of causeways, islands, channels, and shoreline fills. These changes resulted in a progressive reduction in the quantity of tidal water that enters and leaves the bay. Dredging and filling also changed the magnitude and direction of...
Walter F. Holmes, Briant A. Kimball
1987, Water Supply Paper 2248
The potential for developing oil-shale resources in the southeastern Uinta Basin of Utah and Colorado has created the need for information on the quantity and quality of water available in the area. This report describes the availability and chemical quality of ground water, which might provide a source or supplement...
Ernest J. Inman
1987, Water Supply Paper 2317
Flood hydrographs are needed for the design of many highway drainage structures and embankments. A method for simulating these flood hydrographs at ungaged sites in Georgia is presented in this report. The O'Donnell method was used to compute unit hydrographs and lagtimes for 355 floods at 80 gaging stations. An...
Robert E. Kidd, C. R. Bossong
1987, Water Supply Paper 2306
A deterministic precipitation-runoff model, the Precipitation-Runoff Modeling System, was applied in two small basins located in the Warrior coal field, Alabama. Each basin has distinct geologic, hydrologic, and land-use characteristics. Bear Creek basin (15.03 square miles) is undisturbed, is underlain almost entirely by consolidated coal-bearing rocks of Pennsylvanian age (Pottsville...
Jeffrey D. Martin, Charles G. Crawford
1987, Water Supply Paper 2291
The Surface Mining Control and Reclamation Act of 1977 requires that applications for coal-mining permits contain information about the water quality of streams at and near a proposed mine. To meet this need for information, streamflow, specific conductance, pH, and concentrations of total alkalinity, sulfate, dissolved solids, suspended solids, total...
Andrew J. Miller
1987, Water Supply Paper 2234-E
The shoreline of the tidal Potomac River attained its present form as a result of the Holocene episode of sea-level rise; the drowned margins of the system are modified by wave activity in the shore zone and by slope processes on banks steepened by basal-wave erosion. Shore erosion leaves residual...
Raymond W. Schaffranek
1987, Water Supply Paper 2234-D
A one-dimensional model capable of simulating flow in a network of interconnected channels has been applied to the tidal Potomac River including its major tributaries and embayments between Washington, D.C., and Indian Head, Md. The model can be used to compute water-surface elevations and flow discharges at any of 66...
Jonathan K. Lee, David C. Froehlich
1987, Circular 1009
Published literature on the application of the finite-element method to solving the equations of two-dimensional surface-water flow in the horizontal plane is reviewed in this report. The finite-element method is ideally suited to modeling two-dimensional flow over complex topography with spatially variable resistance. A two-dimensional finite-element surface-water flow model with...
Warren Irvin Finch, Richard B. McCammon
1987, Circular 994
Based on the Memorandum of Understanding {MOU) of September 20, 1984, between the U.S. Geological Survey of the U.S. Department of Interior and the Energy Information Administration {EIA) of the U.S. Department of Energy {DOE), the U.S. Geological Survey began to make estimates of the undiscovered uranium endowment of selected...
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...
Thomas E. Reilly, O. Lehn Franke, Gordon D. Bennett
1987, Techniques of Water-Resources Investigations 03-B6
The principle of superposition, a powerful mathematical technique for analyzing certain types of complex problems in many areas of science and technology, has important applications in ground-water hydraulics and modeling of ground-water systems. The principle of superposition states that problem solutions can be added together to obtain composite solutions. This...
D. C. Ross
1987, Open-File Report 87-373
B.M. Miller
1987, Open-File Report 87-404
J. F. Weigel
1987, Open-File Report 87-397
The base of the moderately saline water (water that contains from 3,000 to 10,000 mg/L of dissolved solids) was mapped by using available water quality data and by determining formation-water resistivities from geophysical well logs based on the resistivity-porosity, spontaneous-potential, and resistivity-ratio methods. The contour map developed from these data...
J. S. Stuckless, Kiyoto Futa
1987, Open-File Report 87-507
Thirteen Rb-Sr whole-rock isochrons for postorogenic granites of the eastern Arabian Shield yield ages that range from 567 to 617 Ma, a similar range to that previously determined ages for leucocratic, evolved granites in that region. The dated plutons range widely in terms of degree of petrologic evolution from primitive...
H. R. Shaw
1987, Open-File Report 87-296
R. W. Saltus, A.H. Lachenbruch
1987, Open-File Report 87-618
A. A. Pucci Jr., D. A. Pope
1987, Open-File Report 87-680
Preprocessing and postprocessing computer programs that enhance the utility of the U.S. Geological Survey radial-flow model have been developed. The preprocessor program: (1) generates a triangular finite element mesh from minimal data input, (2) produces graphical displays and tabulations of data for the mesh , and (3) prepares an input...
J. O. Nowlin
1987, Open-File Report 87-554
A digital water quality model was constructed as part of a water quality assessment of the Truckee River downstream from Reno. This report provides documentation on the computer code and the principal data sets used in model calibration, verification, and simulation. (USGS)...
J. T. Nash
1987, Open-File Report 87-595
Results of more than 2,400 analyses of <0.25-mm fraction of stream sediments and nonmagnetic heavy-mineral concentrates from stream sediments from 1,217 sites in the Tonopah quadrangle demonstrate the existence of anomalous concentrations of many metals of economic interest in many areas. Single-element anomalies of As, Pb, or Sb in stream...
D. J. Morrissey
1987, Open-File Report 86-543
The highly permeable, unconfined, glacial drift aquifers that occupy most New England river valleys constitute the principal source of drinking water for many communities that obtain part or all of their public water supply from groundwater. Analytical , two-dimensional numerical and three-dimensional numerical models were used to delineate contributing areas...
S. W. McKenzie, J. F. Rinella
1987, Open-File Report 87-238
In April 1986, the U.S. Geological Survey began the National Water Quality Assessment program to: (1) provide a nationally consistent description of the current status of water quality, (2) define water quality trends that have occurred over recent decades, and (3) relate past and present water quality conditions to relevant...
D. M. Mades
1987, Open-File Report 87-473
In 1986, the U.S. Geological Survey began a National Water-Quality Assessment program to (1) provide nationally consistent descriptions of the current status of water quality for a large, diverse, and geographically distributed part of the Nation's surface- and ground-water resources; (2) define, where possible, trends in water quality; and (3)...