Case study for delineating a contributing area to a water-supply well in a fractured crystalline-bedrock aquifer, Stewartstown, Pennsylvania
Gary J. Barton, Dennis W. Risser, Daniel G. Galeone, Randall W. Conger
1999, Water-Resources Investigations Report 99-4047
The Trouts Lane well field in Stewartstown, Pa., was selected as a case study for delineating a contributing area in a fractured crystalline-bedrock aquifer. The study emphasized the importance of refining the understanding of boundary conditions and major heterogeneities that affect ground-water movement to the supply well by conducting (1)...
Simulated effects of water exchanges on streamflow and specific conductance in the Arkansas River upstream from Avondale, Colorado
Michael E. Lewis
1999, Water-Resources Investigations Report 98-4140
The potential effects of future water-exchange scenarios on streamflow and specific conductance in the Arkansas River were simulated with two accounting models. The major processes in the models simulated the historical exchange potential in the Arkansas River and the operation of a native and a nonnative Arkansas River water exchange....
Ground water and surface water in the Haiku area, East Maui, Hawaii
Stephen B. Gingerich
1999, Water-Resources Investigations Report 98-4142
The Haiku study area lies on the gently sloping eastern flank of the East Maui Volcano (Haleakala) between the drainage basins of Maliko Gulch to the west and Kakipi Gulch to the east. The study area lies on the northwest rift zone of East Maui Volcano, a geologic feature 3...
USGS Science for Restoration of South Florida: The South Florida Ecosystem Program
Benjamin F. McPherson, Sarah Gerould, Aaron L. Higer
1999, Fact Sheet 061-99
As land and resource managers see the value of their resources diminish, and the public watches the environments they knew as children become degraded, there are increasing calls to restore what has been lost, or to build productive ecosystems that will be healthy and sustainable under the conditions of human...
Sedimentation, sea-level rise and circulation in Florida Bay
Water Resources Division, U.S. Geological Survey
1999, Fact Sheet 156-96
Issue Recent algal blooms and seagrass mortality have raised concerns about the water quality of Florida Bay, particularly its nutrient content (nitrogen and phosphorus), hypersalinity, and turbidity. Water quality is closely tied to sediment transport processes because resuspension of sediments increases turbidity, releases stored nutrients, and facilitates sediment export to...
South Florida ecosystems; changes through time
Water Resources Division, U.S. Geological Survey
1999, Fact Sheet 171-95
Ecosystems are communities of organisms, often including humans, and the associated physical and chemical environments in which they live. Ecosystems are a complex natural resource that need to be understood, carefully managed, and prudently conserved. Human modification of the environment, such as changing water drainage patterns and introducing pollutants (such...
Canal and wetland flow transport interaction; coupling models for canal and wetland interactions in the South Florida ecosystem
Raymond W. Schaffranek
1999, Fact Sheet 139-96
IntroductionThe U.S. Geological Survey is one of several agencies participating in the scientific effort to provide knowledge that can help protect and preserve the ecosystem of south Florida. One project of the intergovernmental South Florida Ecosystem Program (SFEP) is focused on developing a computer model to simulate the flow of...
Hydrogeology of the surficial aquifer system in Southwest Florida
Water Resources Division, U.S. Geological Survey
1999, Fact Sheet 158-96
Restoration and management of the south Florida ecosystem will be guided by hydrologic models that simulate water flowing through the wetlands and shallow subsurface aquifers beneath them. The restoration of the ecosystem is, essentially, the restoration of the natural hydrologic system. As surface water is re-diverted from manmade canals to...
Areal studies aid protection of ground-water quality in Illinois, Indiana, and Wisconsin
P.C. Mills, Robert T. Kay, Timothy A. Brown, Douglas J. Yeskis
1999, Water-Resources Investigations Report 98-4143
In 1991, the U.S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency, initiated studies designed to characterize the ground-water quality and hydrogeology in northern Illinois, and southern and eastern Wisconsin (with a focus on the north-central Illinois cities of Belvidere and Rockford, and the Calumet region of northeastern...
Sustainable fisheries management: Pacific salmon
E. Eric Knudsen, Cleveland R. Steward, Donald MacDonald, Jack E. Williams, Dudley W. Reiser, editor(s)
1999, Book
What has happened to the salmon resource in the Pacific Northwest? Who is responsible and what can be done to reverse the decline in salmon populations? The responsibly falls on everyone involved - fishermen, resource managers and concerned citizens alike - to take the steps necessary to ensure that salmon...
Mapping the glacial geology of the Central Great Lakes region in three dimensions: A model for state-federal cooperation
Richard C. Berg, Ned K. Bleuer, Berwyn E. Jones, Kevin A. Kincare, Richard R. Pavey, Byron D. Stone
1999, Open-File Report 99-349
Planners need to evaluate complex and competing public-policy options for managing water, land, and biological resources; they must ensure economic growth, meet the needs of an increasing population, assess hazards, and manage the environment in a sustainable manner. The State Geological Surveys of Illinois, Indiana, Michigan, and Ohio and the...
Geochemistry and hydrogeologic framework of the saline-freshwater interface and the calculation of net recharge in the Dorado area, north-central Puerto Rico
Joseph W. Troester
1999, Water-Resources Investigations Report 98-4030
The upper aquifer near Dorado, Puerto Rico, is a major source of water for both public and private supply. The aquifer is composed of portions of the Aguada Limestone, Aymam6n Limestone, and adjacent permeable portions of unconsolidated deposits. As water moves through the aquifer it changes from a calcium-bicarbonate type...
Digital elevation model (DEM) of Cascadia, latitude 39N-53N, longitude 116W-133W
Ralph A. Haugerud
1999, Open-File Report 99-369
This report contains a 250-meter digital elevation model (DEM) for Cascadia (latitude 39N - 53N, longitude 116W - 133W), a region that encompasses the Cascade volcanic arc, the Cascadia subduction zone, and the Juan de Fuca Ridge system. The DEM is distributed as file cascdem.tar.gz (39 MB; 78MB uncompressed)....
On the modified Mercalli intensities and magnitudes of the 1811/1812 New Madrid, central United States, earthquakes
S. E. Hough, J.G. Armbruster, Leonardo Seeber, J.F. Hough
1999, Open-File Report 99-565
Calibration formulae and values for velocity seismometers used in the 1998 Santa Clara Valley, California seismic experiment
Allan Goddard Lindh, Jerry P. Eaton, Mary O’Neill Allen, John H. Healy, Samuel W. Stewart, Lu Damerell
1999, Open-File Report 99-434
Eaton (1975), Bakun and Dratler (1976), Eaton (1977), Healy and O’Neil (1977), Asten (1977), Stewart and O'Neill (1980), Liu and Peselnick (1986), Eaton (1991), Rodgers et al. (1995), and many others (see Asten (1977) for a list of earlier references) have presented formulae for calculating the damped generator constant (or...
Lithostratigraphy, geophysics, biostratigraphy, and strontium-isotope stratigraphy of the surficial aquifer system of eastern Collier County and northern Monroe County, Florida
S.D. Weedman, Frederick L. Paillet, Lucy E. Edwards, K. R. Simmons, T.M. Scott, B. R. Wardlaw, R.S. Reese, J. L. Blair
1999, Open-File Report 99-432
In 1997, ten cores were drilled in eastern Collier County and northern Monroe County, within the limits of the Big Cypress National Preserve. These cores represent a continuation of the study of seven cores in western Collier County begun in 1996 and reported in Weedman and others (1997) and Edwards...
Rock-fall potential in the Yosemite Valley, California
Gerald F. Wieczorek, Meghan M. Morrissey, Giulio Iovine, Jonathan W. Godt
1999, Open-File Report 99-578
We used two methods of estimating rock-fall potential in the Yosemite Valley, California based on (1) physical evidence of previous rock-fall travel, in which the potential extends to the base of the talus, and (2) theoretical potential energy considerations, in which the potential can extend beyond the base of the...
The Silent Canyon caldera complex — A three-dimensional model based on drill-hole stratigraphy and gravity inversion
Edwin H. McKee, Thomas G. Hildenbrand, Megan L. Anderson, Peter D. Rowley, David A. Sawyer
1999, Open-File Report 99-555
The structural framework of Pahute Mesa, Nevada, is dominated by the Silent Canyon caldera complex, a buried, multiple collapse caldera complex. Using the boundary surface between low density Tertiary volcanogenic rocks and denser granitic and weakly metamorphosed sedimentary rocks (basement) as the outer fault surfaces for the modeled collapse caldera...
Preliminary report on deposit models for sand and gravel in the Cache la Poudre River valley
W. H. Langer, D. A. Lindsey
1999, Open-File Report 99-587
The stratigraphy, sedimentary features, and physical characteristics of gravel deposits in the Cache la Poudre River valley were studied to establish geologic models for these deposits. Because most of the gravel mined in the valley is beneath the low terraces and floodplain, the quality of these deposits for aggregate was studied in...
Procedures and computer programs for telescopic mesh refinement using MODFLOW
Stanley A. Leake, David V. Claar
1999, Open-File Report 99-238
Ground-water models are commonly used to evaluate flow systems in areas that are small relative to entire aquifer systems. In many of these analyses, simulation of the entire flow system is not desirable or will not allow sufficient detail in the area of interest. The procedure of telescopic mesh refinement allows use of...
Selected hydrologic data from the Cedar Rapids area, Linn County, Iowa, April 1996 through March 1999
R.A. Boyd, R.L. Kuzniar, P.M. Schulmeyer
1999, Open-File Report 99-461
The City of Cedar Rapids, Iowa obtains its municipal water supply from four well fields along the Cedar River. The wells are completed at depths of about 60 to 80 feet in a shallow alluvial aquifer adjacent to the Cedar River. The City of Cedar Rapids and the U.S. Geological...
The Universal Transverse Mercator (UTM) grid
Water Resources Division, U.S. Geological Survey
1999, Fact Sheet 157-99
The most convenient way to identify points on the curved surface of the Earth is with a system of reference lines called parallels of latitude and meridians of longitude. On some maps, the meridians and parallels appear as straight lines. On most modern maps, however, the meridians and parallels appear...
McVCO handbook 1999
P.J. McChesney
1999, Open-File Report 99-361
McVCO is a microcontroller-based frequency generator that replaces the voltage controlled oscillator (VCO) used in the analog telemetry of seismic data. It accepts low-level signals from a seismometer and produces a frequency modulated subcarrier suitable for radio or telephone links to a data collection site. McVCO was designed for the purpose...
South and North Barents Triassic-Jurassic total petroleum system of the Russian offshore Arctic
Sandra J. Lindquist
1999, Open-File Report 99-50-N
One major gas-prone petroleum system characterizes the sparsely explored South and North Barents Basin Provinces of the Russian Arctic in the eastern Barents Sea. More than 13 billion barrels of oil equivalent (79 trillion cubic feet of gas) known ultimately recoverable gas reserves in seven fields were sourced from Triassic...
High-Resolution Land Use and Land Cover Mapping
Water Resources Division, U.S. Geological Survey
1999, Fact Sheet 189-99
As the Nation?s population grows, quantifying, monitoring, and managing land use becomes increasingly important. The U.S. Geological Survey (USGS) has a long heritage of leadership and innovation in land use and land cover (LULC) mapping that has been the model both nationally and internationally for over 20 years. At present,...
