Potentiometric surface of the Minnekahta Aquifer in the Black Hills area, South Dakota
Michael L. Strobel, Joel M. Galloway, Ghaith R. Hamade, Gregory J. Jarrell
2000, Hydrologic Atlas 745-B
This map is a product of the Black Hills Hydrology Study, which was initiated in 1990 to assess the quantity, quality, and distribution of surface water and ground water in the Black Hills area of South Dakota (Driscoll, 1992). This long-term study is a cooperative effort between the U.S. Geological...
Potentiometric surface of the Minnelusa Aquifer in the Black Hills area, South Dakota
Michael L. Strobel, Joel M. Galloway, Ghaith R. Hamade, Gregory J. Jarrell
2000, Hydrologic Atlas 745-C
This map is a product of the Black Hills Hydrology Study, which was initiated in 1990 to assess the quantity, quality, and distribution of surface water and ground water in the Black Hills area of South Dakota (Driscoll, 1992). This long-term study is a cooperative effort between the U.S. Geological...
Potentiometric surface of the Madison Aquifer in the Black Hills area, South Dakota
Michael L. Strobel, Joel M. Galloway, Ghaith R. Hamade, Gregory L. Jarrell
2000, Hydrologic Atlas 745-D
This map is a product of the Black Hills Hydrology Study, which was initiated in 1990 to assess the quantity, quality, and distribution of surface water and ground water in the Black Hills area of South Dakota (Driscoll, 1992). This long-term study is a cooperative effort between the U.S. Geological...
Potentiometric surface of the Inyan Kara Aquifer in the Black Hills area, South Dakota
Michael L. Strobel, Joel M. Galloway, Ghaith R. Hamade, Gregory J. Jarrell
2000, Hydrologic Atlas 745-A
This map is a product of the Black Hills Hydrology Study, which was initiated in 1990 to assess the quantity, quality, and distribution of surface water and ground water in the Black Hills area of South Dakota (Driscoll, 1992). This long-term study is a cooperative effort between the U.S. Geological...
Potentiometric surface of the Deadwood Aquifer in the Black Hills area, South Dakota
Michael L. Strobel, Joel M. Galloway, Ghaith R. Hamade, Gregory J. Jarrell
2000, Hydrologic Atlas 745-E
This map is a product of the Black Hills Hydrology Study, which was initiated in 1990 to assess the quantity, quality, and distribution of surface water and ground water in the Black Hills area of South Dakota (Driscoll, 1992). This long-term study is a cooperative effort between the U.S. Geological...
In-situ growth of calcite at Devils Hole, Nevada--Comparison of field and laboratory rates to a 500,000 year record of near-equilibrium calcite growth
Niel Plummer, Eurybiades Busenberg, Alan C. Riggs
2000, Aquatic Geochemistry (6) 257-274
Calcite grew continuously for 500,000 years on the submerged walls of an open fault plane (Devils Hole) in southern Nevada, U.S.A. at rates of 0.3 to 1.3 mm/ka, but ceased growing approximately 60,000 years ago, even though the fault plane remained open and was continuously submerged. The maximum initial in-situ...
Delta subsidence in California: The sinking heart of the state
S. E. Ingebritsen, M. E. Ikehara, D. L. Galloway, D.R. Jones
2000, Fact Sheet 005-00
The Sacramento-San Joaquin River Delta of California once was a great tidal freshwater marsh blanketed by peat and peaty alluvium. Beginning in the late 1800s, levees were built along the stream channels, and the land thus protected from flooding was drained, cleared, and planted. Although the Delta is now an...
Hydrologic and water-quality data for ground water along the Milk River Valley, north-central to northeastern Montana
Sean M. Lawlor
2000, Open-File Report 2000-79
Isostatic gravity map of the Battle Mountain 30 x 60 minute quadrangle, north central Nevada
D. A. Ponce, R. L. Morin
2000, IMAP 2687
Gravity investigations of the Battle Mountain 30 x 60 minute quadrangle were begun as part of an interagency effort by the U.S. Geological Survey (USGS) and the Bureau of Land Management to help characterize the geology, mineral resources, hydrology, and ecology of the Humboldt River Basin in north-central Nevada. The...
Basin level statistical properties of topographic index for North America
Praveen Kumar, Kristine L. Verdin, Susan K. Greenlee
2000, Advances in Water Resources (23) 571-578
For land–atmosphere interaction studies several Topmodel based land-surface schemes have been proposed. For the implementation of such models over the continental (and global) scales, statistical properties of the topographic indices are derived using GTOPO30 (30-arc-second; 1 km resolution) DEM data for North America. River basins and drainage...
Chamber measurement of surface-atmosphere trace gas exchange: Numerical evaluation of dependence on soil interfacial layer, and source/sink products
G.L. Hutchinson, G.P. Livingston, R. W. Healy, Robert G. Striegl
2000, Journal of Geophysical Research D: Atmospheres (105) 8865-8875
We employed a three-dimensional finite difference gas diffusion model to simulate the performance of chambers used to measure surface-atmosphere tace gas exchange. We found that systematic errors often result from conventional chamber design and deployment protocols, as well as key assumptions behind the estimation of trace gas exchange rates...
Biogeochemistry: Hexadecane decay by methanogenesis
Robert T. Anderson, Derek R. Lovely
2000, Nature (404) 722-723
The potential for the biological conversion of long-chain saturated hydrocarbons to methane under anaerobic conditions has been demonstrated by using an enrichment culture of bacteria to degrade pure-phase hexadecane. The formation of methane in hydrocarbon-rich subsurface zones could be explained if a similar conversion of long-chain alkanes to methane were...
Silica-coated titania and zirconia colloids for subsurface transport field experiments
Joseph N. Ryan, Menachem Elimelech, Jenny L. Baeseman, Robin D. Magelky
2000, Environmental Science & Technology (34) 2000-2005
Silica-coated titania (TiO2) and zirconia (ZrO2) colloids were synthesized in two sizes to provide easily traced mineral colloids for subsurface transport experiments. Electrophoretic mobility measurements showed that coating with silica imparted surface properties similar to pure silica to the titania and zirconia colloids. Measurements of steady electrophoretic mobility and size...
Importance of the Mississippi River Basin for investigating agricultural–chemical contamination of the hydrologic cycle
Dana W. Kolpin
2000, Science of the Total Environment (248) 71-72
This special issue is devoted to recent and ongoing research relating to the fate and transport of agricultural chemicals in the Mississippi River Basin by the US Geological Survey Toxic Substances Hydrology (Toxics) Program. The Mississippi River Basin drains approximately 3 200 000 km2 representing 41% of the United States....
The Amazon reveals its secrets--partly
Julio L. Betancourt
2000, Science (290) 2274-2275
The role of the tropics in global climate change during glacial cycles is hotly debated in paleoclimate cycles today. Records from South America have not provided a clear picture of tropical climate change. In his Perspective, Betancourt highlights the study by Maslin and Burns, who have deduced the outflow of...
Occurrence and load of selected herbicides and metabolites in the lower Mississippi River
Gregory M. Clark, Donald A. Goolsby
2000, Science of the Total Environment (248) 101-113
Analyses of water samples collected from the Mississippi River at Baton Rouge, Louisiana, during 1991–1997 indicate that hundreds of metric tons of herbicides and herbicide metabolites are being discharged annually to the Gulf of Mexico. Atrazine, metolachlor, and the ethane-sulfonic acid metabolite of alachlor (alachlor ESA) were the most frequently...
Water levels and ground-water discharge, regional aquifer system of the midwestern Basins and Arches Region, in parts of Indiana, Ohio, Illinois, and Michigan
Sandra M. Eberts
2000, Hydrologic Atlas 725
Aquifers in Quaternary glacial deposits and the underlying Silurian and Devonian carbonate bedrock in parts of Indiana, Ohio, Illinois, and Michigan compose the regional aquifer system under investigation as part of the Midwestern Basins and Arches Regional Aquifer System Analysis (Midwestern Basins and Arches—RASA) project of the U.S. Geological Survey...
The U.S. Geological Survey National Research Program in the hydrologic sciences
Mary Jo Baedecker, Linda C. Friedman, editor(s)
2000, Circular 1195
The National Research Program (NRP) conducts a wide variety of scientific studies related to hydrology, focusing on long-term investigations. This circular conveys general information about the NRP and highlights a few of the program's research activities....
Using OTIS to model solute transport in streams and rivers
Robert L. Runkel
2000, Fact Sheet 138-99
Solute transport in streams and rivers is governed by a suite of hydrologic and geochemical processes. Knowledge of these processes is needed when assessing the fate of contaminants that are released into surface waters. The study of solute fate and transport often is aided by solute transport models that mathematically...
Evaluation and application of the transient-pulse technique for determining the hydraulic properties of low permeability rocks: Part 2: Experimental application
M. Zhang, M. Takahashi, R. Morin, T. Esaki
2000, Geotechnical Testing Journal (23) 91-99
In Part 1 of this study, the general solution to the transient-pulse test (Hsieh et al. 1981) was extended to evaluate quantitatively the transient variations in hydraulic head and the corresponding distributions of hydraulic gradient within a test specimen. In addition, the conditions and the validity of using the expression...
Altitude of the Top of the Minnelusa Formation in the Black Hills area, South Dakota, 1999
Janet M. Carter, Jack A. Redden
2000, Hydrologic Atlas 744-C
This map is a product of the Black Hills Hydrology Study, which was initiated in 1990 to assess the quantity, quality, and distribution of surface water and ground water in the Black Hills area of South Dakota (Driscoll, 1992). This long-term study is a cooperative effort between the U.S. Geological...
Altitude of the top of the Inyan Kara Group in the Black Hills area, South Dakota
Janet M. Carter, Jack A. Redden
2000, Hydrologic Atlas 744-A
This map is a product of the Black Hills Hydrology Study, which was initiated in 1990 to assess the quantity, quality, and distribution of surface water and ground water in the Black Hills area of South Dakota (Driscoll, 1992). This long-term study is a cooperative effort between the U.S. Geological...
Influence of dissimilatory metal reduction on fate of organic and metal contaminants in the subsurface
Derek R. Lovely, Robert T. Anderson
2000, Hydrogeology Journal (8) 77-88
Geobacter become dominant members of the microbial community when Fe(III)-reducing conditions develop as the result of organic contamination, or when Fe(III) reduction is artificially stimulated. These results suggest that further understanding of the ecophysiology of Geobacter species would aid in better prediction of the natural attenuation of organic...
Development of a pore network simulation model to study nonaqueous phase liquid dissolution
Leslie A. Dillard, Martin J. Blunt
2000, Water Resources Research (36) 439-454
A pore network simulation model was developed to investigate the fundamental physics of nonequilibrium nonaqueous phase liquid (NAPL) dissolution. The network model is a lattice of cubic chambers and rectangular tubes that represent pore bodies and pore throats, respectively. Experimental data obtained by Powers [1992] were used to develop and validate the...
Hydrogeology and hydrogeologic terranes of the Blue Ridge and Piedmont Physiographic Provinces in the eastern United States
Thomas O. Mesko, Lindsay A. Swain, E. F. Hollyday
2000, Hydrologic Atlas 732-B
Severe and prolonged droughts between 1961 and 1988, combined with increased demands for freshwater supplies in the United States, have resulted in a critical need to assess the potential for development of ground- and surface-water supplies. Rapid industrial growth and urban expansion have caused existing freshwater supplies to be used...
