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Page 297, results 7401 - 7425

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Proposal and work plan to calibrate and verify a water-quality model to simulate effects of wastewater discharges to the Red River of the North at drought streamflow near Fargo, North Dakota, and Moorhead, Minnesota
Edwin A. Wesolowski
2000, Open-File Report 2000-190
This report presents a proposal for conducting a water-quality modeling study at drought streamflow, a detailed comprehensive plan for collecting the data, and an annual drought-formation monitoring plan. A 30.8 mile reach of the Red River of the North receives treated wastewater from plants at Fargo, North Dakota, and Moorhead,...
Methods of analysis by the U.S. Geological Survey Organic Geochemistry Research Group; determination of chloroacetanilide herbicide metabolites in water using high-performance liquid chromatography-diode array detection and high-performance liquid chromatography/mass spectrometry
L.R. Zimmerman, K.A. Hostetler, E.M. Thurman
2000, Open-File Report 2000-182
Analytical methods using high-performance liquid chromatography-diode array detection (HPLC-DAD) and high-performance liquid chromatography/mass spectrometry (HPLC/MS) were developed for the analysis of the following chloroacetanilide herbicide metabolites in water: acetochlor ethanesulfonic acid (ESA), acetochlor oxanilic acid (OXA), alachlor ESA, alachlor OXA, metolachlor ESA, and metolachlor OXA. Good precision and accuracy were...
MODFLOW-2000, the U.S. Geological Survey modular ground-water model; user guide to the observation, sensitivity, and parameter-estimation processes and three post-processing programs
Mary C. Hill, E. R. Banta, A.W. Harbaugh, E.R. Anderman
2000, Open-File Report 2000-184
This report documents the Observation, Sensitivity, and Parameter-Estimation Processes of the ground-water modeling computer program MODFLOW-2000. The Observation Process generates model-calculated values for comparison with measured, or observed, quantities. A variety of statistics is calculated to quantify this comparison, including a weighted least-squares objective function. In addition, a number of...
Environmental quality and preservation; bedrock beneath reefs; the importance of geology in understanding biological decline in a modern reef ecosystem
Barbara H. Lidz
2000, Open-File Report 2000-46
Environmental Quality and Preservation-Bedrock Beneath Reefs: the Importance of Geology in Understanding Biological Decline in a Modern Ecosystem' is a four-page and one-plate full-color discussion of the geologic framework and evolutionary history of the coral reef ecosystem that lines the outer shelf off the Florida Keys....
2nd interface between ecology and land development in California
Jon E. Keeley, Melanie Baer-Keeley, C.J. Fortheringham
2000, Open-File Report 2000-62
The 2nd Interface Between Ecology and Land Development Conference was held in association with Earth Day 1997, five years after the first Interface Conference. Rapid population growth in California has intensified the inevitable conflict between land development and preservation of natural ecosystems. Sustainable development requires wise use of diminishing natural...
Evaluation of biological data, Guanella Pass Area, Clear Creek and Park counties, Colorado, water years 1995-97
Jennifer R. Cox-Lillis
2000, Open-File Report 2000-54
Macroinvertebrate and algal community samples were collected during a 3-year period at sites located near Guanella Pass, Colorado, to provide baseline characterization data. Water-quality sampling and habitat evaluations were used to aid in the interpretation of the biological data. The study was part of an environmental investigation for a proposed...
Streamflow Statistics for the Narraguagus River at Cherryfield, Maine
Robert W. Dudley, Joseph P. Nielsen
2000, Open-File Report 2000-95
Streamflow data have been collected for the Narraguagus River from 1948 to the present (2000) at the U.S. Geological Survey (USGS) streamgaging station at Cherryfield, Maine. This report describes a study done by the USGS to determine streamflow statistics using the streamflow record at the Narraguagus River station for use...
Abrupt physical and chemical changes during 1992-1999, Anderson Springs, SE Geyser Geothermal Field, California
Cathy J. Janik, Fraser Goff, Stephen R. Walter, Michael L. Sorey, Dale Counce, Elizabeth M. Colvard
2000, Open-File Report 2000-37
The Anderson Springs area is located about 90 miles (145 kilometers) north of San Francisco, California, in the southwestern part of Lake County. The area was first developed in the late 1800s as a health resort, which was active until the 1930s. Patrons drank a variety of cool to hot...