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Page 1501, results 37501 - 37525

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Not all publications have extents, not all extents are completely accurate
Pesticide data for selected Wyoming streams, 1976-78
David L. Butler
1987, Water-Resources Investigations Report 83-4127
In 1976, the U.S. Geological Survey, in cooperation with the Wyoming Department of Agriculture, started a monitoring program to determine pesticide concentrations in Wyoming streams. This program was incorporated into the water-quality data-collection system already in operation. Samples were collected at 20 sites for analysis of various insecticides, herbicides, polychlorinated...
Effect of grid size on digital simulation of ground-water flow in the southern High Plains of Texas and New Mexico
R. R. Luckey, D.M. Stephens
1987, Water-Resources Investigations Report 87-4085
Three models of the aquifer in the southern High Plains were compared to determine the effect of grid size on simulated water levels. The first model, calibrated prior to this study, had 10-mi grid spacing. The mean difference between the simulated and measured pre-development water levels in this model was...
Sediment discharge in Muddy Creek and the effect of sedimentation rate on the proposed Wolford Mountain reservoir near Kremmling, Colorado
B. C. Ruddy
1987, Water-Resources Investigations Report 87-4011
Stream-discharge data collected from May 1982 through October 1985 and sediment data collected from March 1985 through October 1985 at stream flow-gaging station 09041500 Muddy Creek at Kremmling, Colorado, were used to determine total-sediment discharge into the proposed Wolford Mountain Reservoir. The data were divided on a seasonal basis, and...
Nonpoint-source agricultural chemicals in ground water in Nebraska; preliminary results for six areas of the High Plains Aquifer
Hsiu-Hsiung Chen, A.D. Druliner
1987, Water-Resources Investigations Report 86-4338
The reconnaissance phase of a study to determine the occurrence of agricultural chemicals from nonpoint sources in groundwater in six areas, which represented the major provinces of the High Plains aquifer in Nebraska is described. In 1984, water from 82 wells in the 6 study areas was analyzed for nitrate,...
Review of literature on the finite-element solution of the equations of two-dimensional surface-water flow in the horizontal plane
Jonathan K. Lee, David C. Froehlich
1987, Circular 1009
Published literature on the application of the finite-element method to solving the equations of two-dimensional surface-water flow in the horizontal plane is reviewed in this report. The finite-element method is ideally suited to modeling two-dimensional flow over complex topography with spatially variable resistance. A two-dimensional finite-element surface-water flow model with...
Evaluation of selected surface-water-quality stations in Wyoming
S.J. Rucker, L. L. DeLong
1987, Water-Resources Investigations Report 82-4003
The U.S. Geological Survey, in cooperation with the Wyoming Department of Agriculture, has conducted a surface-water-quality program in Wyoming since 1965. The purpose has been to determine the chemical quality of the water in terms of the major dissolved constituents (salinity). Changing agricultural techniques and energy development have stimulated a...
Preliminary Metallogenic Map of North America: A listing of deposits by commodity
Michael P. Lee, Philip White Guild, Paul G. Schruben
1987, Circular 858-C
The 4,215 ore deposits shown on the Preliminary Metallogenic Map of North America and contained in the Metallogenic Map file have been sorted by their principal (first-listed) commodities and grouped into metallic and nonmetallic categories. Deposit listings for 56 individual metals and minerals have been assembled using the data base...
Reconnaissance of geohydrologic areas and 1981 low-flow conditions, Withlacoochee River basin, southwest Florida Water Management District
J. O. Kimrey, Warren Anderson
1987, Water-Resources Investigations Report 86-4203
The Withlacoochee River Basin of the Southwest Florida Water Management District is a management area of about 2030 sq mi in west-central Florida containing large reserves of potable water in the Upper Floridan aquifer. Results of reconnaissance test drilling indicate that the Upper Floridan aquifer may be treated as an...
Evapotranspiration and microclimate at a low-level radioactive-waste disposal site in northwestern Illinois
R. W. Healy, M.P. DeVries, A.M. Sturrock
1987, Open-File Report 86-301
From July 1982 through June 1984, a study was made of the microclimate and evapotranspiration at a low-level radioactive-waste disposal site near Sheffield, Bureau County, Illinois. Vegetation at the site consists of mixed pasture grasses, primarily brome (Bromus inermis) and red clover (Trifoleum pratense). Three methods were used to estimate...
HST3D; a computer code for simulation of heat and solute transport in three-dimensional ground-water flow systems
K.L. Kipp
1987, Water-Resources Investigations Report 86-4095
The Heat- and Soil-Transport Program (HST3D) simulates groundwater flow and associated heat and solute transport in three dimensions. The three governing equations are coupled through the interstitial pore velocity, the dependence of the fluid density on pressure, temperature, the solute-mass fraction , and the dependence of the fluid viscosity on...
Application of techniques to identify coal-mine and power-generation effects on surface-water quality, San Juan River basin, New Mexico and Colorado
C. L. Goetz, Cynthia G. Abeyta, E.V. Thomas
1987, Water-Resources Investigations Report 86-4076
Numerous analytical techniques were applied to determine water quality changes in the San Juan River basin upstream of Shiprock , New Mexico. Eight techniques were used to analyze hydrologic data such as: precipitation, water quality, and streamflow. The eight methods used are: (1) Piper diagram, (2) time-series plot, (3) frequency...
Hydrology of area 59, northern Great Plains and Rocky Mountain coal provinces, Colorado and Wyoming
Neville G. Gaggiani, Linda J. Britton, Donald R. Minges, F. A. Kilpatrick, Randolph S. Parker, James E. Kircher
1987, Open-File Report 85-153
Hydrologic information and analysis aid in decisions to lease federally owned coal and to prepare necessary Environmental Assessments and Impact Study reports. This need has become even more critical with the enactment of Public Law 95-87, the "Surface Mining Control and Reclamation Act of 1977." This act requires an appropriate...
Comparison of conceptually based and regression rainfall-runoff models, Denver Metropolitan area, Colorado, and potential applications in urban areas
J. B. Lindner-Lunsford, S. R. Ellis
1987, Water-Resources Investigations Report 87-4104
Multievent, conceptually based models and a single-event, multiple linear-regression model for estimating storm-runoff quantity and quality from urban areas were calibrated and verified for four small (57 to 167 acres) basins in the Denver metropolitan area, Colorado. The basins represented different land-use types - light commercial, single-family housing, and multi-family...
Surface water-quality characteristics in the upper North Fork Gunnison River basin, Colorado
J. M. Norris
1987, Water-Resources Investigations Report 86-4152
Analyses of water quality data collected during 1982 and 1983 in the upper North Fork Gunnison River basin indicate that dissolved-solids concentrations are relatively small, with a mean value near 97 milligrams per liter. Most major dissolved constituents also had small measured concentrations throughout the study area. Trace-element concentrations generally...
Analysis of sediment production from two small semiarid basins in Wyoming
J.G. Rankl
1987, Water-Resources Investigations Report 85-4314
Data were collected at two small, semiarid basins in Wyoming to determine the relation between rainfall, runoff, and sediment production. The basins were Dugout Creek tributary and Saint Marys Ditch tributary. Sufficient rainfall and runoff data were collected at Dugout Creek tributary to determine the source of sediment and the...
National and regional trends in water-well drilling in the United States, 1964-84
S. M. Hindall, Michael Eberle
1987, Open-File Report 87-247
Information on national and regional water well drilling activity is important for water resource planning and management and for water related equipment marketing. A study was conducted to analyze drilling trends on the basis of data for selected years from 1964 through 1984. The study focused primarily on the years...
Hydrogeology and ground-water quality of the northern part of the Town of Oyster Bay, Nassau County, New York, in 1980
Chabot Kilburn, R.K. Krulikas
1987, Water-Resources Investigations Report 85-4051
This report presents geohydrologic and water quality data from the northern part of the Town of Oyster Bay, in the north-shore area of Long Island. The groundwater reservoir underlying the area consists of clay, silt, sand, and gravel layers that form six geohydrologic units; from bottom to top: the Lloyd...
Simulation of unsteady flow in the Milwaukee Harbor Estuary at Milwaukee, Wisconsin
L. B. House
1987, Water-Resources Investigations Report 86-4050
This report describes the application and results of an unsteady-flow model for the Milwaukee Harbor Estuary. The model simulates unsteady and upstream flow occurring in the estuary as a result of Lake Michigan Seiche. The discharge computed by the model indicates that upstream flow occurs throughout the estuary during periods...
An assessment of the variability in performance of wet atmospheric deposition samplers
R.C. Graham, J.K. Robertson, John Obal
1987, Water-Resources Investigations Report 87-4125
The variability in performance of two brands of wet/dry atmospheric deposition samplers were compared for 1 year at a sincle site. A total of nine samplers were used. Samples were collected weekly and analyzed for pH, specific conductance, common chemical constituents, and sample volume. Additionally, data on the duration of...
Hydrology and water-quality at the Weldon Spring radioactive waste-disposal sites, St. Charles County, Missouri
M. J. Kleeschulte, L. F. Emmett
1987, Water-Resources Investigations Report 87-4169
Water samples from five monitoring wells adjacent to raffinate pits storing low-level radioactive waste contained concentrations of nitrate as nitrogen ranging from 53 to 990 milligrams per liter. Most samples also had maximum concentrations of calcium (900 milligrams per liter), sodium (340 milligrams per liter), sulfate (320 milligrams per liter),...