Nature and chlorine reactivity of organic constituents from reclaimed water in groundwater, Los Angeles County, California
J.A. Leenheer, C.E. Rostad, L. B. Barber, R. A. Schroeder, R. Anders, M.L. Davisson
2001, Environmental Science & Technology (35) 3869-3876
The nature and chlorine reactivity of organic constituents in reclaimed water (tertiary-treated municipal wastewater) before, during, and after recharge into groundwater at the Montebello Forebay in Los Angeles County, CA, was the focus of this study. Dissolved organic matter (DOM) in reclaimed water from this site is primarily a mixture...
Rapid arsenite oxidation by Thermus aquaticus and Thermus thermophilus: Field and laboratory investigations
T.M. Gihring, G.K. Druschel, R. Blaine McCleskey, R.J. Hamers, J.F. Banfield
2001, Environmental Science & Technology (35) 3857-3862
Thermus aquaticus and Thermus thermophilus, common inhabitants of terrestrial hot springs and thermally polluted domestic and industrial waters, have been found to rapidly oxidize arsenite to arsenate. Field investigations at a hot spring in Yellowstone National Park revealed conserved total arsenic transport and rapid arsenite oxidation occurring within the drainage...
Comparison of soil infiltration rates in burned and unburned mountainous watersheds
D.A. Martin, J. A. Moody
2001, Hydrological Processes (15) 2893-2903
Steady-state infiltration measurements were made at mountainous sites in New Mexico and Colorado, USA, with volcanic and granitic soils after wildfires and at comparable unburned sites. We measured infiltration in the New Mexico volcanic soils under two vegetation types, ponderosa pine and mixed conifer, and in the Colorado granitic soils...
Modelling middle pliocene warm climates of the USA
A.M. Haywood, P.J. Valdes, B.W. Sellwood, J.O. Kaplan, H.J. Dowsett
2001, Palaeontologia Electronica (4)
The middle Pliocene warm period represents a unique time slice in which to model and understand climatic processes operating under a warm climatic regime. Palaeoclimatic model simulations, focussed on the United States of America (USA), for the middle Pliocene (ca 3 Ma) were generated using the USGS PRISM2 2?? ??...
Hydrology of Yucca Mountain, Nevada
A. L. Flint, L. E. Flint, E. M. Kwicklis, G.S. Bodvarsson, J. M. Fabryka-Martin
2001, Reviews of Geophysics (39) 447-470
Yucca Mountain, located in southern Nevada in the Mojave Desert, is being considered as a geologic repository for high-level radioactive waste. Although the site is arid, previous studies indicate net infiltration rates of 5-10 mm yr-1 under current climate conditions. Unsaturated flow of water through the mountain generally is vertical...
Effects of Land-Cover Change, Floods, and Stream Position on Geomorphic Processes - Implications for Restoration Activities
F. A. Fitzpatrick
Hayes D.F.Hayes D.F., editor(s)
2001, Conference Paper, Proceedings of the 2001 Wetlands Engineering and River Restoration Conference
A geomorphic study for North Fish Creek, a northern Wisconsin tributary to Lake Superior was analyzed to determine the hydrologic and geomorphic changes caused by clear-cut logging and agricultural activity. Discharge magnitude estimated with HEC-2 for full-channel capacities indicate that modern full-channel discharges are about twice as large as pre-1946...
Online bibliographic sources in hydrology
2001, Book chapter, Information and the professional scientist and engineer
No abstract available....
Assessment of selenium effects in lotic ecosystems
Steven J. Hamilton, Vince P. Palace
2001, Ecotoxicology and Environmental Safety (50) 161-166
The selenium literature has grown substantially in recent years to encompass new information in a variety of areas. Correspondingly, several different approaches to establishing a new water quality criterion for selenium have been proposed since establishment of the national water quality criterion in 1987. Diverging viewpoints and interpretations of the...
Observations of Daily Temperature Patterns in the Southern Florida Everglades
R.W. Schaffranek, H. L. Jenter
Hayes D.F.Hayes D.F., editor(s)
2001, Conference Paper, Proceedings of the 2001 Wetlands Engineering and River Restoration Conference
Temperature is an important factor affecting key hydrological and ecological processes within the subtropical wetlands of the Florida Everglades. Comprehensive measurements are being made to quantify the temporal and spatial variability of the water-temperature regime. Data collected in 2000 at a location near the central flow pathway of the ecosystem...
Surface-water, water-quality, and ground-water assessment of the Municipio of Comerio, Puerto Rico, 1997-99
Jesús Rodríguez-Martínez, Fernando Gómez-Gómez, Luis Santiago-Rivera, M. L. Oliveras-Feliciano
2001, Water-Resources Investigations Report 2001-4083
To meet the increasing need for a safe and adequate supply of water in the municipio of Comerio, an integrated surface-water, water-quality, and ground-water assessment of the area was conducted. The major results of this study and other important hydrologic and water-quality features were compiled in a Geographic Information System,...
Hydrologic conditions and water quality in an agricultural area in Kleberg and Nueces Counties, Texas, 1996-98
Darwin J. Ockerman, Brian L. Petri
2001, Water-Resources Investigations Report 2001-4101
During 1996?98, rainfall and runoff were monitored on a 49,680-acre agricultural watershed in Kleberg and Nueces Counties in South Texas. Nineteen rainfall samples were analyzed for selected nutrients, and runoff samples from 29 storms were analyzed for major ions, nutrients, and pesticides. Loads of nutrients in rainfall and loads of nutrients and pesticides in runoff were computed. For...
Use of a watershed-modeling approach to assess hydrologic effects of urbanization, North Fork Pheasant Branch basin near Middleton, Wisconsin
Jeffrey J. Steuer, R. J. Hunt
2001, Water-Resources Investigations Report 2001-4113
The North Fork Pheasant Branch Basin in Dane County, Wisconsin is expected to undergo development. There are concerns that development will adversely affect water resources with increased flood peaks, increased runoff volumes, and increased pollutant loads. To provide a scientific basis for evaluating the hydrologic system response to development the...
Comparison of Hydrologic Data from Monroe County, Michigan, 1991-2001
J.R. Nicholas, Stephen P. Blumer, Rose M. McGowan
2001, Open-File Report 2001-498
In the summer of 2001, there were renewed concerns about the effects of quarry dewatering on nearby domestic ground-water supplies in Monroe County, Michigan. Reports of domestic wells “going dry” are not uncommon historically in Monroe County. Such reports have been linked to droughts, nearby irrigation, quarrying, and other large...
Hydrologic setting and geochemical characterization of free-phase hydrocarbons in the alluvial aquifer at Mandan, North Dakota, November 2000
Frances D. Hostettler, Colleen E. Rostad, Keith A. Kvenvolden, Geoffrey N. Delin, Larry D. Putnam, Jonathan J. Kolak, Brain P. Chaplin, Bryan D. Schaap
2001, Water-Resources Investigations Report 2001-4108
Free-phase hydrocarbons are present in the alluvial aquifer at Mandan, North Dakota. A large contaminant body of the hydrocarbons [light nonaqueous phase liquid (LNAPL)] floats on the water table about 20 feet below land surface. The main LNAPL body is about 6 feet thick, and the areal extent is about...
Determination of instream metal loads using tracer-injection and synoptic-sampling techniques in Wightman Fork, southwestern Colorado, September 1997
Roderick F. Ortiz, Kenneth E. Bencala
2001, Water-Resources Investigations Report 2000-4154
Spatial determinations of the metal loads in Wightman Fork can be used to identify potential source areas to the stream. In September 1997, a chloride tracer-injection study was done concurrently with synoptic water-quality sampling in Wightman Fork near the Summitville Mine site. Discharge was determined and metal concentrations at 38...
Abstracts from "Coastal Marsh Dieback in the Northern Gulf of Mexico: Extent, Causes, Consequences, and Remedies
C. Edward Proffitt, Tammy Michelle Charron
Robert E. Stewart Jr., editor(s)
2001, Information and Technology Report 2001-0003
In the spring of 2000, scientists discovered a new and unprecedented loss of salt marsh vegetation in coastal Louisiana and other areas along the northern coast of the Gulf of Mexico. This dieback of salt marsh vegetation, sometimes called the brown marsh phenomenon', primarily involved the rapid browning and dieback...
Studies of the San Francisco Bay, California, estuarine ecosystem--Regional monitoring program results, 1998
Andrew J. Arnsberg, Brian E. Cole, James E. Cloern
2001, Open-File Report 2001-68
No abstract available....
MODFLOW-2000, the U.S. Geological Survey modular ground-water model: User guide to the LMT6 package, the linkage with MT3DMS for multi-species mass transport modeling
Chunmiao Zheng, Mary Catherine Hill, Paul A. Hsieh
2001, Open-File Report 2001-82
MODFLOW-2000, the newest version of MODFLOW, is a computer program that numerically solves the three-dimensional ground-water flow equation for a porous medium using a finite-difference method. MT3DMS, the successor to MT3D, is a computer program for modeling multi-species solute transport in three-dimensional ground-water systems using multiple solution techniques, including the...
Status of shallow-aquifer mapping in the Northern Front Range Area, Colorado
Stanley G. Robson
2001, Fact Sheet 069-00
Mapping of shallow aquifers in the northern Front Range area of Colorado has been completed as part of the U.S. Geological Survey Front Range Infrastructure Resources Project. The aquifer mapping was undertaken as part of a comprehensive effort to better define the mineral, energy, cartographic, biological, and water resources that...
Ground-water discharge determined from estimates of evapotranspiration, Death Valley regional flow system, Nevada and California
Randell J. Laczniak, J. LaRue Smith, Peggy E. Elliott, Guy A. DeMeo, Melissa A. Chatigny, Gaius J. Roemer
2001, Water-Resources Investigations Report 2001-4195
The Death Valley regional flow system (DVRFS) is one of the larger ground-water flow systems in the southwestern United States and includes much of southern Nevada and the Death Valley region of eastern California. Centrally located within the ground-water flow system is the Nevada Test Site (NTS). The NTS, a...
River and Reservoir Operations Model, Truckee River basin, California and Nevada, 1998
Steven N. Berris, Glen W. Hess, Larry R. Bohman
2001, Water-Resources Investigations Report 2001-4017
The demand for all uses of water in the Truckee River Basin, California and Nevada, commonly is greater than can be supplied. Storage reservoirs in the system have a maximum effective total capacity equivalent to less than two years of average river flows, so longer-term droughts can result in substantial...
Estimating the magnitude and frequency of floods in rural basins of North Carolina— Revised
Benjamin F. Pope, Gary D. Tasker, Jeanne C. Robbins
2001, Water-Resources Investigations Report 2001-4207
A statewide study was conducted to develop two methods for estimating the magnitude and frequency of floods in rural ungaged basins in North Carolina. Flood-frequency estimates for gaged sites in North Carolina were computed by fitting the annual peak flows for each site to a log-Pearson Type III distribution. As...
Model simulation of the Manasquan water-supply system in Monmouth County, New Jersey
Ming Chang, Gary D. Tasker, Steven Nieswand
2001, Water-Resources Investigations Report 2001-4172
Model simulation of the Manasquan Water Supply System in Monmouth County, New Jersey, was completed using historic hydrologic data to evaluate the effects of operational and withdrawal alternatives on the Manasquan reservoir and pumping system. Changes in the system operations can be simulated with the model using precipitation forecasts. The Manasquan...
Influence of natural factors on the quality of midwestern streams and rivers
Stephen D. Porter, Mitchell A. Harris, Stephen J. Kalkhoff
2001, Water-Resources Investigations Report 2000-4288
Streams flowing through cropland in the Midwestern Corn Belt differ considerably in their chemical and ecological characteristics, even though agricultural land use is highly intensive throughout the entire region. These differences likely are attributable to differences in riparian vegetation, soil properties, and hydrology. This conclusion is based on results from...
Preliminary evaluation of the importance of existing hydraulic-head observation locations to advective-transport predictions, Death Valley regional flow system, California and Nevada
Mary C. Hill, D. Matthew Ely, Claire R. Tiedeman, Grady M. O’Brien, Frank A. D’Agnese, Claudia C. Faunt
2001, Water-Resources Investigations Report 2000-4282
When a model is calibrated by nonlinear regression, calculated diagnostic statistics and measures of uncertainty provide a wealth of information about many aspects of the system. This report presents a method of ranking the likely importance of existing observation locations using measures of prediction uncertainty. It is suggested that continued...
