Rock-fall hazards in the Yosemite Valley
G. F. Wieczorek, M.M. Morrissey, Giulio Iovine, J. W. Godt
1998, Open-File Report 98-467
This report with map shows the areas of highest rock-fall hazard in four selected parts of Yosemite Valley, California, defined by the National Park Service. Two specific levels of hazard are recognized and identified from rock falls ranging in size from individual boulders to moderate-sized events with volumes of 100,000...
Map showing areas with potential for talc deposits in the Gravelly, Greenhorn, and Ruby Ranges and the Henrys Lake Mountains of southwestern Montana
Bradley S. Van Gosen, Richard B. Berg, Jane M. Hammarstrom
1998, Open-File Report 98-224-B
For the last several years, Montana has been the leading talc producing state in the United States (U.S. Geological Survey, 1996). For example, in 1992 Montana supplied about 40 percent of the U.S. mine production of talc (Virta, 1992). All of this production has come from the large deposits of...
Comparative geology and geochemistry of sedimentary-rock-hosted (Carlin Type) gold deposits in the People's Republic of China and in Nevada, USA
Zhiping Li, Stephen G. Peters
1998, Open-File Report 98-466
Sedimentary-rock-hosted (Carlin-type) gold deposits have been considered economically significant and geologically distinct since the early 1960's. This report consists of a nine-part text and an interactive database. This small database is to help Western companies get more information about these gold deposits in China, and to help geologists who are...
A method for producing digital probabilistic seismic landslide hazard maps: An example from the Los Angeles, California, area
Randall W. Jibson, Edwin L. Harp, John A. Michael
1998, Open-File Report 98-113
The 1994 Northridge, California, earthquake is the first earthquake for which we have all of the data sets needed to conduct a rigorous regional analysis of seismic slope instability. These data sets include (1) a comprehensive inventory of triggered landslides, (2) about 200 strong-motion records of the mainshock, (3) 1:24,000-scale...
Review of Aquifer Test Results for the Lansdale Area, Montgomery County, Pennsylvania, 1980–95
Daniel J. Goode, Lisa A. Senior
1998, Open-File Report 98-294
Aquifer and aquifer-isolation test results in and around North Penn Area 6 Superfund site, Lansdale, Montgomery County, Pennsylvania are reviewed to provide estimated aquifer properties for use in a numerical model of ground-water flow. This review was made to support of remedial action investigations by U.S. Environmental Protection Agency (USEPA),...
Additional descriptive models of industrial mineral deposits
G. J. Orris, editor(s)
1998, Open-File Report 98-505
This report includes previously written, but unpublished descriptive industrial mineral deposit models not released in earlier reports (Cox and Singer, 1986; Orris, 1992; Orris and Bliss, 1991, 1992). Although some of the models are preliminary, recent and repeated requests for several of the models has led to their release in...
Depth-duration frequency of precipitation for Texas
William H. Asquith
1998, Water-Resources Investigations Report 98-4044
The U.S. Geological Survey, in cooperation with the Texas Department of Transportation, conducted a study of the depth-duration frequency of precipitation for Texas. Depth-duration frequency is an estimate of the depth of precipitation for a specified duration and frequency or recurrence interval. For this report, precipitation durations of 15, 30,...
MORPH-I (Ver 1.0) a software package for the analysis of scanning electron micrograph (binary formatted) images for the assessment of the fractal dimension of enclosed pore surfaces
Victor G. Mossotti, A. Raouf Eldeeb, Robert Oscarson
1998, Open-File Report 98-248
MORPH-I is a set of C-language computer programs for the IBM PC and compatible minicomputers. The programs in MORPH-I are used for the fractal analysis of scanning electron microscope and electron microprobe images of pore profiles exposed in cross-section. The program isolates and traces the cross-sectional profiles of exposed pores...
Environmental setting of the San Joaquin-Tulare basins, California
JoAnn A. Gronberg, Neil M. Dubrovsky, Charles R. Kratzer, Joseph L. Domagalski, Larry R. Brown, Karen R. Burow
1998, Water-Resources Investigations Report 97-4205
The National Water-Quality Assessment Program for the San Joaquin-Tulare Basins began in 1991 to study the effects of natural and anthropogenic influences on the quality of ground water, surface water, biology, and ecology. The San Joaquin-Tulare Basins study unit, which covers approximately 31,200 square miles in central California, is made...
Hydrogeologic framework of the Willamette Lowland aquifer system, Oregon and Washington
D. G. Woodward, Marshall W. Gannett, J. J. Vaccaro
1998, Professional Paper 1424-B
This report summarizes the hydraulic characteristics of the materials that make up the Willamette Lowland aquifer system, ground-water movement in the aquifer system, estimates of ground-water recharge, ground-water quality characteristics, construction and use of cross-sectional numerical ground-water flow models, hydrologic controls on ground-water movement, water budgets and flow paths, and...
Hydrogeology and simulation of ground-water flow in the Sandstone Aquifer, northeastern Wisconsin
T.D. Conlon
1998, Water-Resources Investigations Report 97-4096
Municipalities in the lower Fox River Valley in northeastern Wisconsin obtain their water supply from a series of permeable sandstones and carbonates of Cambrian to Ordovician age. Withdrawals from this "sandstone aquifer" have resulted in water levels declining at a rate of more than 2 feet per year. The U.S....
Flood-inundation map and water surface profiles for floods of selected recurrence intervals, Cosumnes River and Deer Creek, Sacramento County, California
Joel R. Guay, Jerry G. Harmon, Kelly R. McPherson
1998, Open-File Report 98-283
The damage caused by the January 1997 floods along the Cosumnes River and Deer Creek generated new interest in planning and managing land use in the study area. The 1997 floodflow peak, the highest on record and considered to be a 150-year flood, caused levee failures at 24 locations. In...
Simulation of ground-water flow, Dayton area, southwestern Ohio
D.H. Dumouchelle
1998, Water-Resources Investigations Report 98-4048
A numerical model was used simulate the regional ground-water-flow system in the Dayton area in southwestern Ohio. Ground water is the primary source of drinking water for the Dayton area. The aquifer consists of glacial sands and gravels in a buried bedrock valley. The shale bed rock in the area...
Recharge-area delineation and hydrology, McCraken Springs, Fort Knox Military Reservation, Meade County, Kentucky
Charles J. Taylor, Gregory K. McCombs
1998, Water-Resources Investigations Report 98-4196
McCraken Springs, consisting of three perennial springs - Main, Bat Cave, and Rocky Springs—and several intermittent springs, are used as a source of public water by the Fort Knox Military Reservation in Meade County, Ky. The water supply provided by McCraken Springs is potentially vulnerable to natural and induced stresses...
Ground-water flow in the New Jersey Coastal Plain
Mary Martin
1998, Professional Paper 1404-H
Ground-water flow in 10 aquifers and 9 intervening confining units of the New Jersey Coastal Plain was simulated as part of the Regional Aquifer System Analysis. Data on aquifer and confining unit characteristics and on pumpage and water levels from 1918 through 1980 were incorporated into a multilayer finite-difference model....
Grade and tonnage models for Coeur d'Alene-type polymetallic veins
K. R. Long
1998, Open-File Report 98-583
Simulating transport of volatile organic compounds in the unsaturated zone using the computer model R-UNSAT
Matthew A. Lahvis, Arthur L. Baehr
1998, Fact Sheet 019-98
Subsurface spills of gasoline and other petroleum products are a common environmental problem throughout the industrialized world. The U.S. Environmental Protection Agency has estimated that 40 percent of the more than 200,000 retail service stations in the United States have had accidental releases of petroleum hydrocarbons to the subsurface (U.S....
Use of a ground-water flow model with particle tracking to evaluate ground-water vulnerability, Clark County, Washington
Daniel T. Snyder, James M. Wilkinson, Leonard L. Orzol
1998, Water Supply Paper 2488
A ground-water flow model was used in conjunction with a particle-tracking program to demonstrate a method of evaluating ground-water vulnerability. The study area encompassed the part of the Portland Basin located in Clark County, Washington. A new computer program was developed that interfaces the particle-tracking program with a geographic information...
Hydrologic and hydraulic analyses of selected streams in Erie County, Ohio
K. Scott Jackson, Chad J. Ostheimer, Matthew T. Whitehead
1998, Open-File Report 1998–0395
Hydrologic and hydraulic analyses were done for parts of Abel Ditch, Edson Creek, Maurer Ditch, and Sherod Creek1 in northeastern Vermilion Township, Erie County, Ohio. For each stream, instantaneous peak discharges for floods having recurrence intervals of 2, 5, 10, 25, 50, and 100 years were estimated using regional regression...
Computer Programs to Display and Modify Data in Geographic Coordinates and Methods to Transfer Positions to and from Maps, with Applications to Gravity Data Processing, Global Positioning Systems, and 30-Meter Digital Elevation Models
Donald Plouff
1998, Open-File Report 98-233
Computer programs were written in the Fortran language to process and display gravity data with locations expressed in geographic coordinates. The programs and associated processes have been tested for gravity data in an area of about 125,000 square kilometers in northwest Nevada, southeast Oregon, and northeast California. This report discusses...
Preliminary estimates of residence times and apparent ages of ground water in the Chesapeake Bay watershed, and water-quality data from a survey of springs
Michael J. Focazio, Niel Plummer, John K. Bohlke, Eurybiades Busenberg, L. Joseph Bachman, David S. Powars
1998, Water-Resources Investigations Report 97-4225
Knowledge of the residence times of the ground-water systems in Chesapeake Bay watershed helps resource managers anticipate potential delays between implementation of land-management practices and any improve-ments in river and estuary water quality. This report presents preliminary estimates of ground-water residence times and apparent ages of water in...
Water-quality characteristics of the Slate and East Rivers, Colorado, during the winter recreational season, December 1996
N.E. Spahr, J. R. Deacon
1998, Open-File Report 98-279
Periods of population influxes during winter recreation occur simultaneously with periods of extreme low flow in many Rocky Mountain areas. The ability of streams to assimilate additional nutrient loading is reduced by the low-flow conditions. Low-flow water-quality characteristics of the Slate and East Rivers, which drain the Crested Butte area,...
Concepts for monitoring water quality in the Spokane River Basin, northern Idaho and eastern Washington
M.A. Beckwith
1998, Open-File Report 98-534
Numerous environmental studies have been conducted in the Spokane River Basin over the past several decades by government agencies, academic institutions, and environmental engineering firms. Most of these efforts have focused on the environmental effects of more than a century of silver, lead, and zinc mining and oreprocessing activities in the South Fork Coeur d'Alene River valley in...
Geohydrology and simulated ground-water flow in northwestern Elkhart County, Indiana
L. D. Arihood, D.A. Cohen
1998, Water-Resources Investigations Report 97-4204
In 1994, the U.S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency and the City of Elkhart, developed a ground-water model of the Elkhart, Indiana, area to determine the avail-ability and source of water at potential new well fields. The modeled area covered 190 square miles of northwestern...
Three-dimensional model of Paleozoic basement beneath Amargosa Desert and Pahrump Valley, California and Nevada: Implications for tectonic evolution and water resources
R.J. Blakely, R. L. Morin, E.H. McKee, K. M. Schmidt, V.E. Langenheim, G. L. Dixon
1998, Open-File Report 98-496
No abstract available....
