Areas contributing ground water to the Peconic Estuary, and ground-water budgets for the north and south forks and Shelter Island, eastern Suffolk County, New York
C.E. Schubert
1998, Water-Resources Investigations Report 97-4136
The Peconic Estuary, at the eastern end of Long Island, has been plagued by a recurrent algal bloom, locally referred to as ?Brown Tide,? that has caused the severe decline of local marine resources. Although the factors that trigger Brown Tide blooms remain uncertain, groundwater discharge has previously been shown...
Hydrogeology and simulation of ground-water flow in the Paluxy aquifer in the vicinity of Landfills 1 and 3, U.S. Air Force Plant 4, Fort Worth, Texas
Eve L. Kuniansky, Stanley T. Hamrick
1998, Water-Resources Investigations Report 98-4023
Ground-water contamination of the surficial terrace alluvial aquifer has occurred at U.S. Air Force Plant 4, a government-owned, contractor-operated facility, northwest of Fort Worth, Texas. A poorly constructed monitoring well, P–22M, open to the underlying middle zone of the Paluxy aquifer was installed at landfill 3, October 1987, allowing leakage...
Regional rainfall-runoff relations for simulation of streamflow for watersheds in Du Page County, Illinois
James J. Duncker, Charles S. Melching
1998, Water-Resources Investigations Report 98-4035
Rainfall and streamflow data collected from July 1986 through September 1993 were utilized to calibrate and verify a continuous-simulation rainfall-runoff model for three watersheds (11.8--18.0 square miles in area) in Du Page County. Classification of land cover into three categories of pervious (grassland, forest/wetland, and agricultural land) and one category...
Methods and guidelines for effective model calibration; with application to UCODE, a computer code for universal inverse modeling, and MODFLOWP, a computer code for inverse modeling with MODFLOW
M. C. Hill
1998, Water-Resources Investigations Report 98-4005
One-Dimensional Transport with Inflow and Storage (OTIS): A Solute Transport Model for Streams and Rivers
Robert L. Runkel
1998, Water-Resources Investigations Report 98-4018
OTIS is a mathematical simulation model used to characterize the fate and transport of water-borne solutes in streams and rivers. The governing equation underlying the model is the advection-dispersion equation with additional terms to account for transient storage, lateral inflow, first-order decay, and sorption. This equation and the associated equations...
Assessment of ground-water vulnerability to atrazine leaching in Kent County, Michigan; review, comparison of results of other studies and verification
D. J. Holtschlag, C. L. Luukkonen
1998, Water-Resources Investigations Report 98-4006
Model assumptions and parameters used in an earlier study of the vulnerability of ground water in Kent County, Michigan, to atrazine contamination were reviewed and compared with other studies. The review indicated that model assumptions are consistent with those used in other models and that the parameters assigned in the...
Analytical methods, numerical modeling, and monitoring strategies for evaluating the effects of ground-water withdrawals on unconfined aquifers in the New Jersey Coastal Plain
Edward Modica
1998, Water-Resources Investigations Report 98-4003
Analytical and numerical solutions of ground-water withdrawals in the unconfined part of the Kirkwood-Cohansey aquifer system of the Coastal Plain of New Jersey were evaluated for their usefulness in predicting the area of influence of a pumped well and in determining hydraulic characteristics of an aquifer. Additionally, simulations of ground-water...
Pesticides in storm runoff from agricultural and urban areas in the Tuolumne River basin in the vicinity of Modesto, California
Charles R. Kratzer
1998, Water-Resources Investigations Report 98-4017
The occurrence, concentrations, and loads of dissolved pesticides in storm runoff were compared for two contrasting land uses in the Tuolumne River Basin, California, during two different winter storms: agricultural areas (February 1994) and the Modesto urban area (February 1995). Both storms followed the main application period of pesticides on...
Digital geologic map of the Thirsty Canyon NW quadrangle, Nye County, Nevada
S.A. Minor, P. P. Orkild, K. A. Sargent, R.G. Warren, D.A. Sawyer, J.B. Workman
1998, Open-File Report 98-623
This digital geologic map compilation presents new polygon (i.e., geologic map unit contacts), line (i.e., fault, fold axis, dike, and caldera wall), and point (i.e., structural attitude) vector data for the Thirsty Canyon NW 7 1/2' quadrangle in southern Nevada. The map database, which is at 1:24,000-scale resolution, provides geologic...
Probability of detecting atrazine/desethyl-atrazine and elevated concentrations of nitrate (NO2+NO3-N) in ground water in the Idaho part of the upper Snake River basin
Michael G. Rupert
1998, Water-Resources Investigations Report 98-4203
Draft Federal regulations may require that each State develop a State Pesticide Management Plan for the herbicides atrazine, alachlor, cyanazine, metolachlor, and simazine. This study developed maps that the Idaho State Department of Agriculture might use to predict the probability of detecting atrazine and desethyl-atrazine (a breakdown product of atrazine)...
Mississippi Basin Carbon Project science plan
E.T. Sundquist, R.F. Stallard, N.B. Bliss, H. W. Markewich, J.W. Harden, M.J. Pavich, M.D. Dean Jr.
1998, Open-File Report 98-177
Understanding the carbon cycle is one of the most difficult challenges facing scientists who study the global environment. Lack of understanding of global carbon cycling is perhaps best illustrated by our inability to balance the present-day global CO2 budget. The amount of CO2 produced by burning fossil fuels and by...
Design, revisions, and considerations for continued use of a ground-water-flow model of the coastal plain aquifer system in Virginia
E. R. McFarland
1998, Water-Resources Investigations Report 98-4085
A digital numerical model of the ground-water-flow system in the Virginia Coastal Plain was constructed as part of the Regional Aquifer System Analysis program of the U.S. Geological Survey and subsequently revised based on reinterpretations of the hydrogeologic framework. The revised model has been incorporated by the Virginia Department of...
Evaluation of the hydrologic system and selected water-management alternatives in the Owens Valley, California
Wesley R. Danskin
1998, Water Supply Paper 2370-H
The Owens Valley, a long, narrow valley along the east side of the Sierra Nevada in east-central California, is the main source of water for the city of Los Angeles. The city diverts most of the surface water in the valley into the Owens River-Los Angeles Aqueduct system, which transports...
Ground Water in the Southern Lihue Basin, Kauai, Hawaii
Scot K. Izuka, Stephen B. Gingerich
1998, Water-Resources Investigations Report 98-4031
A multi-phased study of ground-water resources, including well drilling, aquifer tests, analysis of ground-water discharge, and numerical ground-water modeling, indicates that the rocks of the southern Lihue Basin, Kauai, have permeabilities that are much lower than in most other areas of ground-water development in the Hawaiian islands. The regional hydraulic...
Soil, environmental, and watershed measurements in support of carbon cycling studies in northwestern Mississippi
Thomas G. Huntington, J.W. Harden, S. M. Dabney, D. A. Marion, C. Alonso, J. M. Sharpe, T. L. Fries
1998, Open-File Report 98-501
Measurements including soil respiration, soil moisture, soil temperature, and carbon export in suspended sediments from small watersheds were recorded at several field sites in northwestern Mississippi in support of hillslope process studies associated with the U.S. Geological Survey's Mississippi Basin Carbon Project (MBCP). These measurements were made to provide information...
Diatom paleoecology Pass Key core 37, Everglades National Park, Florida Bay
Laura Pyle, S. R. Cooper, J.K. Huvane
1998, Open-File Report 98-522
During the 20th century, there have been large-scale anthropogenic modifications to the South Florida ecosystem. The effects of these changes on Florida Bay and its biological communities are currently of political and scientific interest. This study is part of a larger effort to reconstruct the history of environmental changes in...
Oreshoot zoning in the Carlin-type Betze orebody, Goldstrike Mine, Eureka County, Nevada
Stephen G. Peters, Gregory C. Ferdock, Maria B. Woitsekhowskaya, Robert Leonardson, Jerry Rahn
1998, Open-File Report 98-620
Field and laboratory investigations of the giant Betze gold orebody, the largest Carlin-type deposit known, in the north-central Carlin trend, Nevada document that the orebody is composed of individual high-grade oreshoots that contain different geologic, mineralogic, and textural characteristics. The orebody is typical of many structurally controlled Carlin-type deposits, and...
Slope maps of the San Francisco Bay region, California: A digital database
Scott E. Graham, Richard J. Pike
1998, Open-File Report 98-766
PREFACE: Topography, the configuration of the land surface, plays a major role in various natural processes that have helped shape the ten-county San Francisco Bay region and continue to affect its development. Such processes include a dangerous type of landslide, the debris flow (Ellen and others, 1997) as well...
Modeling approaches for assessing the risk of nonpoint-source contamination of ground water
B. T. Nolan
1998, Open-File Report 98-531
Modified Mercalli intensities for some recent California earthquakes and historic San Francisco Bay Region earthquakes
William H. Bakun
1998, Open-File Report 98-584
Modified Mercalli Intensity (MMI) data for recent California earthquakes were used by Bakun and Wentworth (1997) to develop a strategy for bounding the location and moment magnitude M of earthquakes from MMI observations only. Bakun (Bull. Seismol. Soc. Amer., submitted) used the Bakun and Wentworth (1997) strategy to analyze 19th...
Potential mineral resources, Payette National Forest, Idaho: Description and probabilistic estimation
Arthur A. Bookstrom, Bruce R. Johnson, Theresa M. Cookro, Karen Lund, Kenneth C. Watts, Harley D. King, Merlin D. Kleinkopf, James A. Pitkin, J. David Sanchez, J. Douglas Causey
1998, Open-File Report 98-219-A
The Payette National Forest (PNF), in west-central Idaho, is geologically diverse and contains a wide variety of mineral resources. Mineral deposit types are grouped into locatable, leasable, and salable categories. The PNF has substantial past production and identified resources of locatable commodities, including gold, silver, copper, zinc, tungsten, antimony, mercury,...
World conventional crude oil and natural gas: Identified reserves, undiscovered resources and futures
C.D. Masters, D. H. Root, R. M. Turner
1998, Open-File Report 98-468
This report summarizes, at the petroleum basin level, the United States Geological Survey's World Energy Program 1993 assessment of world conventional oil and gas resources. The maps provided show boundaries of petroleum basins that are referenced by the assessment, as well as, future oil and gas potential. The 'Futures' or...
Surficial geology of Shaver Hollow, Shenandoah National Park
Benjamin A. Morgan
1998, Open-File Report 98-343
At the request of Shenandoah National Park and the Department of Environmental Sciences at the University of Virginia, the US Geological Survey has completed an examination and map of the surficial deposits in Shaver Hollow. The work was carried out as part of the US Geological Survey - National Park...
Simulation of ground-water flow and stream-aquifer relations in the vicinity of the Savannah River Site, Georgia and South Carolina, predevelopment through 1992
John S. Clarke, Christopher T. West
1998, Water-Resources Investigations Report 98-4062
Ground-water flow and stream-aquifer relations were simulated for seven aquifers in Coastal Plain sediments in the vicinity of the U.S. Department of Energy, Savannah River Site (SRS), in Georgia and South Carolina to evaluate the potential for ground water containing hazardous materials to migrate from the SRS into Georgia through...
Surficial geologic map along the Castle Mountain Fault between Houston and Hatcher Pass Road, Alaska
Peter J. Haeussler
1998, Open-File Report 98-480
The surficial geology of the map area is dominated by sedimentary deposits laid down during and after the Naptowne glaciation (Karlstrom, 1964) of late Pleistocene age. During this episode, a large valley glacier flowed westward down the Matanuska Valley along the southern flank of the Talkeetna Mountains. The youngest of...
