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Page 3183, results 79551 - 79575

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Principal facts for gravity stations in the vicinity of Coyote Spring Valley, Nevada, with initial gravity modeling results
Geoffrey A. Phelps, E. B. Jewel, V.E. Langenheim, R.C. Jachens
2000, Open-File Report 2000-420
Gravity measurements were made along 5 profiles across parts of the Coyote Spring Valley and vicinity in order to aid in modeling the depth and shapes of the underlying basins and to locate faults concealed beneath the basin fill. Measurements were taken at 200 m (660 ft) spacing along the...
Guidelines and standard procedures for continuous water-quality monitors: Site selection, field operation, calibration, record computation, and reporting
Richard J. Wagner, Harold C. Mattraw, George F. Ritz, Brett A. Smith
2000, Water-Resources Investigations Report 2000-4252
The U.S. Geological Survey uses continuous water-quality monitors to assess variations in the quality of the Nation's surface water. A common system configuration for data collection is the four-parameter water-quality monitoring system, which collects temperature, specific conductance, dissolved oxygen, and pH data, although systems can be configured to measure other...
Simple Techniques For Assessing Impacts Of Oil And Gas Operations On Federal Lands - A Field Evaluation At Big South Fork National River And Recreation Area, Scott County, Tennessee
James K. Otton, Robert A. Zielinski
2000, Open-File Report 2000-499
Simple, cost-effective techniques are needed for land managers to assess the environmental impacts of oil and gas production activities on public lands so that sites may be prioritized for further, more formal assessment or remediation. These techniques should allow the field investigator to extend the assessment beyond the surface disturbances documented by simple observation and mapping...
Concentrations and loads of cadmium, lead, and zinc measured near the peak of the 1999 snowmelt-runoff hydrographs for 42 water-quality stations, Coeur d'Alene River basin, Idaho
Paul F. Woods
2000, Open-File Report 2000-322
The Remedial Investigation/Feasibility Study conducted by the U.S. Environmental Protection Agency within the Spokane River Basin of northern Idaho and eastern Washington included extensive data-collection activities to determine the nature and extent of trace-element contamination within the basin. The U.S. Geological Survey designed and implemented synoptic sampling of the 1999...
Assessment of Folsom Lake response to historical and potential future climate scenarios
Huaming Yao, Aris P. Georgakakos
2000, Open-File Report 2000-336
An integrated forecast-decision system for Folsom Lake (California) is developed and used to assess the sensitivity of reservoir performance to various forecast-management schemes under historical and future climate scenarios. The assessments are based on various combinations of inflow forecasting models, decision rules, and climate scenarios and demonstrate that (1) reliable...
Principal facts for gravity stations in the Antelope Valley-Bedell Flat area, west-central Nevada
Eleanore B. Jewel, David A. Ponce, Robert L. Morin
2000, Open-File Report 2000-506
In April 2000 the U.S. Geological Survey (USGS) established 211 gravity stations in the Antelope Valley and Bedell Flat area of west-central Nevada (see figure 1). The stations were located about 15 miles north of Reno, Nevada, southwest of Dogskin Mountain, and east of Petersen Mountain, concentrated in Antelope Valley...
Analytical results and sample locations of reanalyzed NURE stream-sediment and soil samples for the Humboldt River basin mineral-environmental assessment, northern Nevada
H. W. Folger (compiler)
2000, Open-File Report 2000-421
The U.S. Geological Survey (USGS), in cooperation with the Bureau of Land Management (BLM), began a study in 1996 to describe to the geochemistry of the Humboldt River Basin. The principal sample media evaluated are stream-sediment and soil samples retrieved from the National Uranium Resource Evaluation (NURE) archives located in...
Parameterizing century to model cultivated and noncultivated sites in the Loess region of western Iowa
Kristen L. Manies, Jennifer W. Harden, Larry Kramer, William Parton
2000, Open-File Report 2000-508
One of the main questions remaining for global science involves the cycle of carbon among the atmosphere, oceans, and land. Scientists are trying to better determine the amount of carbon stored in and transferred between these three locations. This task has become more complex because in recent decades the amount...
Surface Water Quality-Assurance Plan for the North Florida Program Office of the U.S. Geological Survey
Marvin A. Franklin
2000, Open-File Report 2000-199
The U.S. Geological Survey, Water Resources Division, has a policy that requires each District office to prepare a Surface Water Quality-Assurance Plan. The plan for each District describes the policies and procedures that ensure high quality in the collection, processing, analysis, computer storage, and publication of surface-water data. The North...
Hydrogeology and the distribution of salinity in the Floridan Aquifer system, southwestern Florida
R.S. Reese
2000, Water-Resources Investigations Report 98-4253
A study was conducted to establish a detailed hydrogeologic framework in the complex Floridan aquifer system of southwestern Florida, and to evaluate and relate the distribution of salinity found in this system. The Floridan aquifer system consists of the Upper Floridan aquifer, middle confining unit, and Lower Floridan aquifer. The...
Assessment of Folsom Lake Watershed response to historical and potential future climate scenarios
Theresa M. Carpenter, Konstantine P. Georgakakos
2000, Open-File Report 2000-333
An integrated forecast-control system was designed to allow the profitable use of ensemble forecasts for the operational management of multi-purpose reservoirs. The system ingests large-scale climate model monthly precipitation through the adjustment of the marginal distribution of reservoir-catchment precipitation to reflect occurrence of monthly climate precipitation amounts in the extreme...
Climate change impacts on southeastern U.S. basins
Aris P. Georgakakos, Huaming Yao
2000, Open-File Report 2000-334
The work described herein aims to assess the impacts of potential climate change on the Apalachicola-Chattahoochee-Flint (ACF) and Alabama-Coosa-Talapoosa (ACT) river basins in the Southeastern US. The assessment addresses the potential impacts on watershed hydrology (soil moisture and streamflow) and on major water uses including water supply, drought management, hydropower,...
Soil moisture tendencies into the next century for the conterminous United States
Konstantine P. Georgakakos, Diane E. Smith
2000, Open-File Report 2000-335
A monthly snow-pack and soil- moisture accounting model is formulated for application to each of the climate divisions of the conterminous United States for use in climate impacts-assessment studies. Statistical downscaling and bias-adjustment components complement the model for the assimilation of large-scale global climate model data. Simulations of the formulated...
An assessment of irrigation needs and crop yield for the United States under potential climate changes
Kelly Brumbelow, Aris P. Georgakakos
2000, Open-File Report 2000-332
Past assessments of climate change on U.S. agriculture have mostly focused on changes in crop yield. Few studies have included the entire conterminous U.S., and few studies have assessed changing irrigation requirements. None have included the effects of changing soil moisture characteristics as determined by changing climatic forcing. This study...
Cruise report for A1-00-SC southern California earthquake hazards project, part A
Christina E. Gutmacher, William R. Normark, Stephanie L. Ross, Brian D. Edwards, Ray Sliter, Patrick Hart, Becky Cooper, Jon Childs, Jane A. Reid
2000, Open-File Report 2000-516
A three-week cruise to obtain high-resolution boomer and multichannel seismic-reflection profiles supported two project activities of the USGS Coastal and Marine Geology (CMG) Program: (1) evaluating the earthquake and related geologic hazards posed by faults in the near offshore area of southern California and (2) determining the pathways through which...
Water-quality data collected at Lake Anne, Reston, Virginia, 1997-1999
Kathryn M. Conko, Margaret M. Kennedy, Karen C. Rice
2000, Open-File Report 2000-481
Samples from the Lake Anne watershed were collected and analyzed to assess the water quality from December 1997 through January 1999. Lake Anne is a stream impoundment in suburban Northern Virginia and its outflow is a sub-tributary of the Potomac River. Samples of wet deposition (precipitation), lake water, and streamwater...
Transport of suspended and bedload sediment at eight stations in the Coeur d'Alene River basin, Idaho
Greg M. Clark, Paul F. Woods
2000, Open-File Report 2000-472
The Remedial Investigation/Feasibility Study conducted by the U.S. Environmental Protection Agency within the Spokane River Basin of northern Idaho and eastern Washington included extensive data-collection activities to determine the nature and extent of trace-element contamination within the basin. As part of the investigation, the U.S. Geological Survey designed and implemented...
Map of Distribution of Bottom Sediments on the Continental Shelf, Gulf of Alaska
Kevin R. Evans, Paul R. Carlson, Monty A. Hampton, Michael S. Marlow, Peter W. Barnes
2000, Miscellaneous Field Studies Map 2335
Introduction The U.S. Geological Survey has a long history of exploring marine geology in the Gulf of Alaska. As part of a cooperative program with other federal and state agencies, the USGS is investigating the relations between ocean-floor geology and benthic marine biohabitats. This bottom sediment map, compiled from published literature...