Skip to main content
U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Results

68937 results.

Alternate formats: RIS file of the first 3000 search results  |  Download all results as CSV | TSV | Excel  |  RSS feed based on this search  |  JSON version of this page of results

Page 1010, results 25226 - 25250

Show results on a map

Publication Extents

Not all publications have extents, not all extents are completely accurate
Continuous hydrologic simulation and flood-frequency, hydraulic, and flood-hazard analysis of the Blackberry Creek watershed, Kane County, Illinois
David T. Soong, Timothy D. Straub, Elizabeth A. Murphy
2006, Scientific Investigations Report 2005-5270
Results of hydrologic model, flood-frequency, hydraulic model, and flood-hazard analysis of the Blackberry Creek watershed in Kane County, Illinois, indicate that the 100-year and 500-year flood plains range from approximately 25 acres in the tributary F watershed (a headwater subbasin at the northeastern corner of the watershed) to almost 1,800...
Chlorophyll a and inorganic suspended solids in backwaters of the upper Mississippi River system: Backwater lake effects and their associations with selected environmental predictors
James T. Rogala, Brian R. Gray
2006, Open-File Report 2006-1043
The Long Term Resource Monitoring Program (LTRMP) uses a stratified random sampling design to obtain water quality statistics within selected study reaches of the Upper Mississippi River System (UMRS). LTRMP sampling strata are based on aquatic area types generally found in large rivers (e.g., main channel, side channel, backwater, and...
Interactive effects of dissolved zinc and orthophosphate on phytoplankton from Coeur d'Alene Lake, Idaho
James S. Kuwabara, Brent R. Topping, Paul F. Woods, James L. Carter, Stephen W. Hager
2006, Scientific Investigations Report 2006-5091
Within the longitudinal chemical-concentration gradient in Coeur d'Alene Lake, generated by inputs from the St. Joe and Coeur d'Alene Rivers, two dominant algal species, Chlorella minutissima and Asterionella formosa, were isolated and cultured in chemically defined media to examine growth response to a range of dissolved orthophosphate concentrations and zinc-ion...
Guidelines and standard procedures for continuous water-quality monitors: Station operation, record computation, and data reporting
Richard J. Wagner, Robert W. Boulger Jr., Carolyn J. Oblinger, Brett A. Smith
2006, Techniques and Methods 1-D3
The U.S. Geological Survey uses continuous water-quality monitors to assess the quality of the Nation's surface water. A common monitoring-system configuration for water-quality data collection is the four-parameter monitoring system, which collects temperature, specific conductance, dissolved oxygen, and pH data. Such systems also can be configured to measure other properties,...
EMMMA: A web-based system for environmental mercury mapping, modeling, and analysis
Hearn Jr., Stephen P. Wente, David I. Donato, John J. Aguinaldo
2006, Open-File Report 2006-1086
Mercury in our environment - in our air, water, soil, and especially our food - poses significant hazards to human health, particularly for developing fetuses and young children. Because of the importance of this issue and the length of time it has been studied, large and complex data sets of...
Status of water levels and selected water-quality conditions in the Sparta-Memphis aquifer in Arkansas, Spring-Summer 2003
T.P. Schrader
2006, Scientific Investigations Report 2006-5021
During the spring of 2003, water levels were measured in 341 wells in the Sparta-Memphis aquifer in Arkansas. Waterquality samples were collected for temperature and specificconductance measurements during the spring-summer of 2003 from 70 wells in Arkansas in the Sparta-Memphis aquifer. Maps of areal distribution of potentiometric surface, change in...
Analysis of ambient conditions and simulation of hydrodynamics and water-quality characteristics in Beaver Lake, Arkansas, 2001 through 2003
Joel M. Galloway, W. Reed Green
2006, Scientific Investigations Report 2006-5003
Beaver Lake is a large, deep-storage reservoir located in the upper White River Basin in northwestern Arkansas. The purpose of this report is to describe the ambient hydrologic and water-quality conditions in Beaver Lake and its inflows and describe a two-dimensional model developed to simulate the hydrodynamics and water quality...
Volatile organic compounds in the nation's ground water and drinking-water supply wells
John S. Zogorski, Janet M. Carter, Tamara Ivahnenko, Wayne W. Lapham, Michael J. Moran, Barbara L. Rowe, Paul J. Squillace, Patricia L. Toccalino
2006, Circular 1292
This national assessment of 55 volatile organic compounds (VOCs) in ground water gives emphasis to the occurrence of VOCs in aquifers that are used as an important supply of drinking water. In contrast to the monitoring of VOC contamination of ground water at point-source release sites, such as landfills and leaking...
The U.S. Geological Survey and City of Atlanta water-quality and water-quantity monitoring network
Arthur J. Horowitz, W. Brian Hughes
2006, Fact Sheet 2005-3126
Population growth and urbanization affect the landscape, and the quality and quantity of water in nearby rivers and streams, as well as downstream receiving waters (Ellis, 1999). Typical impacts include: (1) disruption of the hydrologic cycle through increases in the extent of impervious surfaces (e.g., roads, roofs, sidewalks) that increase...
A computer program for estimating instream travel times and concentrations of a potential contaminant in the Yellowstone River, Montana
Peter McCarthy
2006, Scientific Investigations Report 2006-5057
The Yellowstone River is very important in a variety of ways to the residents of southeastern Montana; however, it is especially vulnerable to spilled contaminants. In 2004, the U.S. Geological Survey, in cooperation with Montana Department of Environmental Quality, initiated a study to develop a computer program to rapidly estimate...
Gravity investigations of the Chickasaw National Recreation Area, south-central Oklahoma
Daniel S. Scheirer, Allegra Hosford Scheirer
2006, Open-File Report 2006-1083
The geological configuration of the Arbuckle Uplift in the vicinity of Chickasaw National Recreation Area in south-central Oklahoma plays a governing role in the distribution of fresh and mineral springs within the park and in the existence of artesian wells in and around the park. A confining layer of well-cemented...
Water resources data, Florida, water year 2005. Volume 1B: Northeast Florida ground water
A.P. Nazarian, E.P. Simonds, S.M. Dickerson
2006, Water Data Report FL-05-1B
Water resources data for the 2005 water year in Florida consist of continuous or daily discharge for 429 streams, periodic discharge for 9 streams, continuous or daily stage for 218 streams, periodic stage for 5 streams, peak stage and discharge for 28 streams; continuous or daily elevations for 15 lakes,...
Water resources data - Wisconsin, water year 2005
R.J. Waschbusch, D.L. Olson, S.B. Marsh
2006, Water Data Report WI-05-1
Water-resources data for the 2005 water year for Wisconsin include records of streamflow at gaging stations, partial-record stations, and miscellaneous sites, records of precipitation, and records of chemical, biological, and physical characteristics of surface water. In addition, water levels in observation wells are reported. These data were collected by the...
Physical and vegetative characteristics of a relocated stream reach, constructed wetland, and riparian buffer, Upper Saucon Township, Lehigh County, Pennsylvania, 2000-04
Jeffrey J. Chaplin, Kirk E. White, Connie A. Loper
2006, Scientific Investigations Report 2006-5042
The U.S. Geological Survey, in cooperation with the Pennsylvania Department of Transportation, Engineering District 5-0, investigated physical and vegetative changes within a relocated stream reach, constructed wetland, and riparian buffer from September 2000 to October 2004. This report presents an evaluation of data collected using methods from multiple sources that...
Use of the Multi-Node Well (MNW) package when simulating solute transport with the MODFLOW ground-water transport process
Leonard F. Konikow, G.Z. Hornberger
2006, Techniques and Methods 6-A15
This report describes modifications to a U.S. Geological Survey (USGS) three-dimensional solute-transport model (MODFLOW-GWT), which is incorporated into the USGS MODFLOW ground-water model as the Ground-Water Transport (GWT) Process. The modifications were made to create compatibility between the Multi-Node Well (MNW) Package for MODFLOW and the MODFLOW-GWT model. This compatibility...
Flow and salt transport in the Suwannee River estuary, Florida, 1999–2000: Analysis of data and three-dimensional simulations
Jerad D. Bales, S. A. Tomlinson, Gina Tillis
2006, Professional Paper 1656-B
A three-dimensional numerical model was developed to assist in the evaluation of the effects of changes in freshwater flow on the salinity regime of the lower Suwannee River, its estuary, and Suwannee Sound. Hydrodynamic and salt-transport modeling were supported by data from a comprehensive data-collection network operated in the lower Suwannee...
MODOPTIM: A general optimization program for ground-water flow model calibration and ground-water management with MODFLOW
Keith J. Halford
2006, Scientific Investigations Report 2006-5009
MODOPTIM is a non-linear ground-water model calibration and management tool that simulates flow with MODFLOW-96 as a subroutine. A weighted sum-of-squares objective function defines optimal solutions for calibration and management problems. Water levels, discharges, water quality, subsidence, and pumping-lift costs are the five direct observation types that can be compared...
Water resources data Virginia water year 2005 Volume 2. Ground-water level and ground-water quality records
Shaun Wicklein, Eugene D. Powell, Joel R. Guyer, Joseph A. Owens
2006, Water Data Report VA-05-2
Water-resources data for the 2005 water year for Virginia consist of records of water levels and water quality of ground-water wells. This report (Volume 2. Ground-Water-Level and Ground-Water-Quality Records) contains water levels at 349 observation wells and water quality at 29 wells. Locations of these wells are shown on figures...
Use of sediment rating curves and optical backscatter data to characterize sediment transport in the Upper Yuba River watershed, California, 2001-03
Jennifer A. Curtis, Lorraine E. Flint, Charles N. Alpers, Scott Wright, Noah P. Snyder
2006, Scientific Investigations Report 2005-5246
Sediment transport in the upper Yuba River watershed, California, was evaluated from October 2001 through September 2003. This report presents results of a three-year study by the U.S. Geological Survey, in cooperation with the California Ecosystem Restoration Program of the California Bay-Delta Authority and the California Resources Agency. Streamflow and...