Modeling hexavalent chromium reduction in groundwater in field-scale transport and laboratory batch experiments
J.C. Friedly, J.A. Davis, D.B. Kent
1995, Water Resources Research (31) 2783-2794
A plausible and consistent model is developed to obtain a quantitative description of the gradual disappearance of hexavalent chromium (Cr(VI)) from groundwater in a small-scale field tracer test and in batch kinetic experiments using aquifer sediments under similar chemical conditions. The data exhibit three distinct timescales. Fast reduction occurs in...
Collection of short papers on Beaver Creek watershed studies in West Tennessee, 1989-94
W. Harry. Doyle (compiler), Eva G. Baker
1995, Open-File Report 95-156
In 1989, the U.S. Geological Survey began a scientific investigation to evaluate the effect of agricultural activities on water quality and the effectiveness of agricultural best management practices in the Beaver Creek watershed, West Tennessee. The project is being conducted jointly with other Federal, State, county agencies, the farming community,...
Characterizing water quality in the North Fork-Fall Creek Hydrologic Unit Area, Tennessee
Thomas Duane Byl, H. C. Mattraw
1995, Open-File Report 95-372
The North Fork-Fall Creek Watershed in Bedford County, Tennessee is a karst terrain with a complex interconnection between ground water and the surface water-drainage network. Multiple sources of agricultural and domestic contamination make the effective design of best management practices difficult. Ongoing investigations by the U.S. Geological Survey and several...
Sources of geologic and hydrologic information pertinent to ground-water resources in Rhode Island
Elaine C. Trench
1995, Open-File Report 93-464
This report summarizes sources of geologic and hydrologic information useful to water managers and others involved in the investigation, appraisal, development, and protection of ground-water resources in Rhode Island. The geographic scope of the report includes Rhode Island and small adjoining areas of Massachusetts and Connecticut, where drainage basins are...
Lake-level frequency analysis for Devils Lake, North Dakota
Gregg J. Wiche, Aldo V. Vecchia
1995, Open-File Report 95-123
Two approaches were used to estimate future lake-level probabilities for Devils Lake. The first approach is based on an annual lake-volume model, and the second approach is based on a statistical water mass-balance model that generates seasonal lake volumes on the basis of seasonal precipitation, evaporation, and inflow.Autoregressive moving average...
Water-resources activities of the U.S. Geological Survey in Montana, October 1993 through September 1995
C. J. Harksen (compiler), Karen S. Midtlyng
1995, Open-File Report 95-194
Water-resources programs and activities of the U.S. Geological Survey in Montana consist principally of hydrologic-data collection and investigative studies that address water-resource issues. The work is supported by direct Federal funding, by transfer of funds from other Federal agencies, and by joint funding agreements with State or local agencies. The...
Hydrologic data of two wetlands at Spring City, Tennessee, December 1991 through November 1992
Gregory C. Johnson, Lawrence M. Brede
1995, Open-File Report 95-278
Hydrologic data for two small adjacent wetlands at Spring City, Tennessee, were collected from December 1991 through November 1992. One of the wetlands was natural and the other was constructed to replace a wetland disturbed by the construction of a road embankment. Water levels were monitored in five 7-inch-diameter wells,...
A computer program (MACPUMP) for interactive aquifer-test analysis
F. D. Day-Lewis, M.A. Person, Leonard F. Konikow
1995, Water-Resources Investigations Report 95-4012
This report introduces MACPUMP (Version 1.0), an aquifer-test-analysis package for use with Macintosh4 computers. The report outlines the input- data format, describes the solutions encoded in the program, explains the menu-items, and offers a tutorial illustrating the use of the program. The package reads list-directed aquifer-test data from a file,...
Data on natural organic substances in dissolved, colloidal, suspended-silt and -clay, and bed-sediment phases in the Mississippi River and some of its tributaries, 1991-92
J.A. Leenheer, L. B. Barber, C.E. Rostad, T.I. Noyes
1995, Water-Resources Investigations Report 94-4191
No abstract available....
Hydrologic basins and hydrologic-monitoring sites of Lake Tahoe Basin, California and Nevada
Kenn D. Cartier, Lorri A. Peltz, K.F. Long
1995, Open-File Report 95-316
A Lagrangian stochastic model for aerial spray transport above an oak forest
Yansen Wang, David R. Miller, Dean E. Anderson, Michael L. McManus
1995, Agricultural and Forest Meteorology (76) 277-291
An aerial spray droplets' transport model has been developed by applying recent advances in Lagrangian stochastic simulation of heavy particles. A two-dimensional Lagrangian stochastic model was adopted to simulate the spray droplet dispersion in atmospheric turbulence by adjusting the Lagrangian integral time scale along the drop trajectory. The other major...
Hydrologic and geochemical effects on oxygen uptake in bottom sediments of an effluent-dominated river
P.B. McMahon, J.A. Tindall, J.A. Collins, K.J. Lull, J.R. Nuttle
1995, Water Resources Research (31) 2561-2569
More than 95% of the water in the South Platte River downstream from the largest wastewater treatment plant serving the metropolitan Denver, Colorado, area consists of treated effluent during some periods of low flow. Fluctuations in effluent-discharge rates caused daily changes in river stage that promoted exchange of water between...
Gross-beta activity in ground water: natural sources and artifacts of sampling and laboratory analysis
Alan H. Welch, Zoltan Szabo, David L. Parkhurst, Peter C. Van Metre, Ann H. Mullin
1995, Applied Geochemistry (10) 491-503
Gross-beta activity has been used as an indicator of beta-emitting isotopes in water since at least the early 1950s. Originally designed for detection of radioactive releases from nuclear facilities and weapons tests, analysis of gross-beta activity is widely used in studies of naturally occurring radioactivity in ground water. Analyses of...
Estimating 14C groundwater ages in a methanogenic aquifer
Ramon Aravena, Leonard I Wassenaar, Niel Plummer
1995, Water Resources Research (31) 2307-2317
This paper addresses the problem of 14C age dating of groundwaters in a confined regional aquifer affected by methanogenesis. Increasing CH4 concentrations along the groundwater flow system and 13C and 14C isotopic data for dissolved inorganic carbon, dissolved organic carbon, and CH4 clearly show the effect of methanogenesis on groundwater chemistry. Inverse reaction path modeling...
Methane production and consumption monitored by stable H and C isotope ratios at a crude oil spill site, Bemidji, Minnesota
Kinga Revesz, Tyler B. Coplen, Mary J. Baedecker, Pierre D. Glynn
1995, Applied Geochemistry (10) 505-516
Stable isotopic ratios of C and H in dissolved CH4 and C in dissolved inorganic C in the ground water of a crude-oil spill near Bemidji, Minnesota, support the concept of CH4production by acetate fermentation with a contemporaneous increase in HCO3−concentration. Methane concentrations in the saturated zone decrease from 20.6...
State-dependent anisotrophy: Comparison of quasi-analytical solutions with stochastic results for steady gravity drainage
Timothy R. Green, David L. Freyberg
1995, Water Resources Research (31) 2201-2211
Anisotropy in large-scale unsaturated hydraulic conductivity of layered soils changes with the moisture state. Here, state-dependent anisotropy is computed under conditions of large-scale gravity drainage. Soils represented by Gardner's exponential function are perfectly stratified, periodic, and inclined. Analytical integration of Darcy’s law across each layer results in a system of...
Combined use of groundwater dating, chemical, and isotopic analyses to resolve the history and fate of nitrate contamination in two agricultural watersheds, Atlantic coastal plain, Maryland
J.K. Böhlke, J. M. Denver
1995, Water Resources Research (31) 2319-2339
The history and fate of groundwater nitrate (NO3−) contamination were compared in 2 small adjacent agricultural watersheds in the Atlantic coastal plain by combined use of chronologic (CCl2F2, 3H), chemical (dissolved solids, gases), and isotopic (δ15N,δ13C, δ34S) analyses of recharging groundwaters, discharging groundwaters, and surface waters. The results demonstrate the interactive...
Geometry of sorbed arsenate on ferrihydrite and crystalline FeOOH: Re-evaluation of EXAFS results and topological factors in predicting sorbate geometry, and evidence for monodentate complexes
Glenn A. Waychunas, James A. Davis, Christopher C. Fuller
1995, Geochimica et Cosmochimica Acta (59) 3655-3661
Manceau's (1995) reinterpretation of some of our EXAFS results (Waychunas et al., 1993) has been analyzed using both old and newly collected data in an attempt to clarify the nature of proposed monodentate and edge-sharing bidentate arsenate complexes on the ferrihydrite surface. It is shown that EXAFS analysis utilizing data...
A selected bibliography on the hydrology of the Platte River basin in Nebraska through 1991
Melissa Hardgree, Jennifer A. McChesney
1995, Open-File Report 94-496
Nonpoint sources of pesticides in the San Joaquin River, California; input from winter storms, 1992-93
Joseph L. Domagalski
1995, Open-File Report 95-165
Organophosphate insecticides, including chlor- pyrifos, diazinon, and methidathion, are applied to dormant orchards in the San Joaquin Valley, California, during late December through January. This time frame coincides with the period of heaviest rainfall in the valley, and rainfall mobilizes a portion of these pesticides from the orchards. The pesticides...
Concentration and transport data for selected dissolved inorganic constituents and dissolved organic carbon in water collected from the Mississippi River and some of its tributaries, July 1991-May 1992
John R. Garbarino, Ronald C. Antweiler, T.I. Brinton, D.A. Roth, Howard E. Taylor
1995, Open-File Report 95-149
No abstract available....
A selected bibliography of water-related research in the upper Klamath Basin, Oregon
Dorie L. Brownell, Mia R. Rinallo
1995, Open-File Report 95-285
A bibliography containing 165 selected references was compiled to assist local, State, and Federal agencies that have ongoing water-related research interests in the Upper Klamath Basin. The report has two parts. Part 1 is a list of bibliographic citations alphabetized by author, and Part 2 is a subject index that...
Intercomparison experiments on dissolved trace-metal data from the Mississippi River and some of its tributaries, 1989-90
Howard E. Taylor, A.M. Shiller, J.R. Garbarino, T.I. Brinton
1995, Open-File Report 93-628
No abstract available....
Pesticide, nutrient, water-discharge and physical-property data for the Mississippi River and some of its tributaries, April 1991-September 1992
Richard H. Coupe
1995, Open-File Report 93-657
No abstract available....
Geohydrologic framework, historical development of the ground-water system, and general hydrologic and water-quality conditions in 1990, South San Francisco Bay and Peninsula area, California
John L. Fio, David A. Leighton
1995, Open-File Report 94-357
