Solutions to questions
D.E. Anderson
1999, Book chapter, Instructor's solution manual for unsaturated zone hydrology for scientists and engineers
No abstract available. ...
Ground-water flow paths and traveltime to three small embayments within the Peconic Estuary, eastern Suffolk County, New York
Christopher Schubert
1999, Water-Resources Investigations Report 98-4181
The Peconic Estuary, at the eastern end of Long Island, has been plagued by a recurrent algal bloom that has caused the severe decline of local marine resources. Although the onset, duration, and cessation of the bloom remain unpredictable, ground-water discharge has been shown to affect surface-water quality in the...
Use of historical and geospatial data to guide the restoration of a Lake Erie coastal marsh
Kurt P. Kowalski, Douglas A. Wilcox
1999, Wetlands (19) 858-868
Historical and geospatial data were used to identify the relationships between water levels, wetland vegetation, littoral drift of sediments, and the condition of a protective barrier beach at Metzger Marsh, a coastal wetland in western Lake Erie, to enhance and guide a joint federal and state wetland restoration project. Eleven...
Techniques for restoration of disturbed coastal wetlands of the Great Lakes
Douglas A. Wilcox, Thomas H. Whillans
1999, Wetlands (19) 835-857
A long history of human-induced degradation of Great Lakes wetlands has made restoration a necessity, but the practice of wetland restoration is relatively new, especially in large lake systems. Therefore, we compiled tested methods and developed additional potential methods based on scientific understanding of Great Lakes wetland ecosytems to providc...
Integrating physical and chemical characteristics of lakes into the glacially influenced landscape of the Northern Cascade Mountains, Washington State, USA
Gary L. Larson, G.A. Lomnicky, Robert Hoffman, W.J. Liss, E. Deimling
1999, Environmental Management (24) 219-228
A basic knowledge of the physical and chemical characteristics of lakes is needed by management to make informed decisions to protect water resources. In this study we investigated some of the physical and chemical characteristics of 58 lakes in alpine, subalpine, and forest vegetation zones in a natural area (North...
Altitude of the top of the Deadwood Formation in the Black Hills area, South Dakota
Janet M. Carter, Jack A. Redden
1999, Hydrologic Atlas 744-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...
Detecting long-term hydrological patterns at Crater Lake, Oregon
D. L. Peterson, D.G. Silsbee, Kelly T. Redmond
1999, Northwest Science (73) 121-130
Tree-ring chronologies for mountain hemlock (Tsuga mertensiana) were used to reconstruct the water level of Crater Lake, a high-elevation lake in the southern Cascade Range of Oregon. Reconstructions indicate that lake level since the late 1980s has been lower than at any point in the last 300 years except the early 1930s...
Altitude of the top of the Minnekahta Limestone in the Black Hills area, South Dakota
Janet M. Carter, Jack A. Redden
1999, Hydrologic Atlas 744-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 groundwater in the Black Hills area of South Dakota (Driscoli, 1992). This long-term study is a cooperative effort between the U.S. Geological Survey...
1:2,000,000-scale Hydrologic Units of the United States
John Watermolen
1999, Report
This file contains hydrologic unit boundaries and codes for the conterminous United States along with Alaska, Hawaii, Puerto Rico and the U.S. Virgin Islands. It was revised for inclusion in the National Atlas of the United States of America, and updated to match the streams file created by the USGS...
The occurrence of wetlands within the context of hydrologic landscapes
Thomas C. Winter
1999, Conference Paper, Proceedings of Specialty Conference on Potential Consequences of Climate Variability and Change to Water Resources of the United States
No abstract available....
Bivalve biomarker workshop: Overview and discussion group summaries
A.H. Ringwood, M.J. Hameedi, R.F. Lee, M. Brouwer, E. C. Peters, G.I. Scott, S. N. Luoma, R.T. Di Giulio
1999, Biomarkers (4) 391-399
No abstract available....
The interaction of natural organic matter with iron in a wetland (Tennessee Park, Colorado) receiving acid mine drainage
Stefan Peiffer, Katherine Walton-Day, Donald L. Macalady
1999, Aquatic Geochemistry (5) 207-223
Pore water from a wetland receiving acid mine drainage was studied for its iron and natural organic matter (NOM) geochemistry on three different sampling dates during summer 1994. Samples were obtained using a new sampling technique that is based on screened pipes of varying length (several centimeters), into which dialysis...
Is a probabilistic performance assessment enough?
Leonard F. Konikow, Rodney C. Ewing
1999, Groundwater (37) 481-482
No abstract available....
1:2,000,000-scale Hydrologic Units of the United States
John Watermolen
1999, Report
This data set has been superseded by huc2m. This file contains hydrologic unit boundaries and codes for the conterminous United States along with Alaska, Hawaii, Puerto Rico and the U.S. Virgin Islands. It was revised for inclusion in the National Atlas of the United States of America, and updated to...
Regional hydrology of the Dixie Valley geothermal field, Nevada: preliminary interpretations of chemical and isotopic data
Gregory Nimz, Cathy Janik, Fraser Goff, Charles Dunlap, Mark Huebner, Dale Counce, Stuart D. Johnson
1999, Book chapter, Global geothermal resources: sustainable energy for the future
Chemical and isotopic analyses of Dixie Valley regional waters indicated several distinct groups ranging in recharge age from Pleistocene (1000a). Geothermal field fluids (~12-14 ka) appear derived from water similar in composition to non thermal groundwater observed today in valley artesian well (also ~14 ka). Geothermal fluid interaction with mafic...
Use and misuse of the chloride-mas balance method in estimating ground water recharge
Warren W. Wood
1999, Groundwater (37) 2-3
No abstract available....
Molecular analysis of microbial community structures in pristine and contaminated aquifers: Field and laboratory microcosm experiments
Y. Shi, M.D. Zwolinski, M.E. Schreiber, J.M. Bahr, G.W. Sewell, W.J. Hickey
1999, Applied and Environmental Microbiology (65) 2143-2150
This study used phylogenetic probes in hybridization analysis to (i) determine in situ microbial community structures in regions of a shallow sand aquifer that were oxygen depleted and fuel contaminated (FC) or aerobic and noncontaminated (NC) and (ii) examine alterations in microbial community structures resulting from exposure to toluene and/or...
Soil respiration at the Amargosa Desert Research site: A section in U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)
Alan C. Riggs, Robert G. Striegl, Florentino B. Maestas
David W. Morganwalp, Herbert T. Buxton, editor(s)
1999, Report, U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)
Automated opaque flux-chamber measurements of soil carbon dioxide (CO2) flux (soil respiration) into the atmosphere at the Amargosa Desert Research Site show seasonal and diel cycles of soil respiration that are closely linked with soil temperature and soil moisture. During 1998, soil respiration increased with soil warming through spring, reaching...
Wetlands of the Prairie Pothole Region: Invertebrate species composition, ecology, and management
N.H. Euliss Jr., D.A. Wrubleski, D.M. Mushet
D.P. Batzer, R.B. Rader, S.A. Wissinger, editor(s)
1999, Book chapter, Invertebrates in freshwater wetlands of North America: Ecology and management
The Prairie Pothole Region (PPR) of the United States and Canada is a unique area where shallow depressions created by the scouring action of Pleistocene glaciation interact with mid-continental climate variations to create and maintain a variety of wetland classes. These wetlands possess unique environmental and biotic characteristics that add...
Tritium and 14C concentrations in unsaturated-zone gases at test hole UZB-2, Amargosa Desert Research Site, 1994-98: A section in U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)>
David E. Prudic, Robert G. Striegl, Richard W. Healy, Robert L. Michel, Herbert Haas
David W. Morganwalp, Herbert T. Buxton, editor(s)
1999, Report, U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)
Tritium concentrations have been determined yearly since April 1994 from water-vapor samples collected at test hole UZB-2. The hole was drilled about 100 m (meters) south of the southwest corner of a commercial burial site for low-level radioactive wastes in September 1993. UZB-2 is equipped with ten 2.5-cm (centimeters) diameter...
Isotopic composition of water in a deep unsaturated zone beside a radioactive-waste disposal area near Beatty, Nevada
David A. Stonestrom, David E. Prudic, Robert G. Striegl
David W. Morganwalp, Herbert T. Buxton, editor(s)
1999, Report, U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)
The isotopic composition of water in deep unsaturated zones is of interest because it provides information relevant to hydrologic processes and contaminant migration. Profiles of oxygen-18 (18O), deuterium (D), and tritium (3H) from a 110-meter deep unsaturated zone, together with data on the isotopic composition of ground water...
Stream restoration at Denali National Park and Preserve
Roseann V. Densmore, Kenneth F. Karle
1999, Conference Paper, Proceedings: High altitude revegetation workshop No. 13; Information series no. 89
Placer mining for gold has severely disturbed many riparian ecosystems in northern regions. We are conducting a long-term project to test methods to promote restoration of a placer-mined watershed in Denali National Park and Preserve. The project included hydrological restoration of the unstable and excessively confined stream with heavy equipment....
The effects of DEM generalization methods on derived hydrologic features
D.B. Gesch
1999, Book chapter, Spatial accuracy assessment-Land information uncertainty in natural resources
No abstract available....
Correlated factors in amphibian decline: Exotic species and habitat change in western Washington
M. J. Adams
1999, Journal of Wildlife Management (63) 1162-1171
Amphibian declines may frequently be associated with multiple, correlated factors. In western North America, exotic species and hydrological changes are often correlated and are considered 2 of the greatest threats to freshwater systems. Bullfrog (Rana catesbeiana) introductions are frequently cited as a threat to lentic-breeding anurans native to western North...
Adsorption of bacteriophages on clay minerals
Sandip Chattopadhyay, Robert W. Puls
1999, Environmental Science & Technology (33) 3609-3614
The ability to predict the fate of microorganisms in soil is dependent on an understanding of the process of their sorption on soil and subsurface materials. Presently, we have focused on studying the thermodynamics of sorption of bacteriophages (T-2, MS-2, and φX-174) on clays (hectorite, saponite, kaolinite, and clay fraction...
