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Page 3758, results 93926 - 93950

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Effects of the eruptions of Mount St. Helens on physical, chemical, and biological characteristics of surface water, ground water, and precipitation in the Western United States
Douglas B. Lee
1996, Water Supply Paper 2438
Over 120 publications that describe the 1980 eruption effects of Mount St. Helens on rivers, lakes, and the Columbia River estuary are reviewed. Water-quality changes ranged from minor, short-lived effects, to totally altered drainage basins and newly created lakes. Turbidity increased; concentrations of cations, anions, and dissolved organic carbon increased....
Movement of agricultural chemicals between surface water and ground water, lower Cedar River basin, Iowa
Paul J. Squillace, J.P. Caldwell, P.M. Schulmeyer, C.A. Harvey
1996, Water Supply Paper 2448
Movement of agricultural chemicals alachlor, atrazine, cyanazine, deethylatrazine, deisopropylatrazine, and metolachlor between surface water and ground water is documented by data collected from May 1989 through July 1991 at an unfarmed study site adjacent to the Cedar River in Iowa. During periods of runoff, these chemicals moved from the Cedar...
Variations in land use and nonpoint-source contamination on the Fort Berthold Indian Reservation, west-central North Dakota, 1990-93
Kathleen Macek-Rowland, Robert M. Lent
1996, Water-Resources Investigations Report 96-4007
The effects of land-use activities on the water quality of five streams on the Fort Berthold Indian Reservation were evaluated. The five basinsevaluated were East Fork Shell Creek, Deepwater Creek, Bear Den Creek, Moccasin Creek, and Squaw Creek. East Fork Shell Creek and DeepwaterCreek Basins are located east of Lake...
Direct temperature measurements of deposits, Mount St. Helens, Washington, 1980-1981
Norman G. Banks, Richard P. Hoblitt
1996, Professional Paper 1387
A program of temperature studies of the eruptive products of Mount St. Helens was established May 20, 1980, 2 days after the catastrophic eruption of May 18. Temperature-depth profiles were measured by thermocouple to determine the emplacement temperatures of deposits of the debris avalanche and blast of May 18 and...
Factors affecting tritium and 14carbon distributions in the unsaturated zone near the low-level radioactive-waste burial site south of Beatty, Nevada
Robert G. Striegl, David E. Prudic, J. S. Duval, R. W. Healy, E. R. Landa, D.W. Pollock, D.C. Thorstenson, R.P. Weeks
1996, Open-File Report 96-110
Interpretations of the distributions of tritiated water vapor (HTOV) and 14carbon dioxide gas (14CO2) concentrations in the unsaturated zone adjacent to the low-level radioactive-waste burial site south of Beatty, Nevada, suggest that observed concentrations of 14CO2 could be explained by either diffusive or advective transport of the radioactive gas from...
Bridge-scour instrumentation and data for nine sites in Oregon, 1991-94
Milo D. Crumrine, Karl K. Lee, Richard L. Kittelson
1996, Open-File Report 95-366
This report is a compilation of bridge-scour instrumentation information, bridge-scour data, and hydraulic data for nine sites studied in Oregon from October 1991 through September 1994. The Alsea Bay scour monitoring site was established to test new bridge-scour monitoring equipment, whereas the eight additional sites were established to monitor scour-hole...
Field test of two single-frequency GPS receivers
E.Y. Iwatsubo
1996, Open-File Report 96-43
The U.S. Geological Survey's Cascades Volcano Observatory (CVO) has been testing low-cost, low-power Global Positioning System (GPS) receivers for use in the monitoring of restless volcanoes. Field tests of two single-frequency (L1 only) receivers, the Ashtech SCA-12S and the Leica SR261 show that these units can measure positions precisely enough...
A nitrogen-rich septage-effluent plume in a glacial aquifer, Cape Cod, Massachusetts, February 1990 through December 1992
Leslie A. DeSimone, Paul M. Barlow, Brian L. Howes
1996, Water Supply Paper 2456
Physical, chemical, and microbial processes controlled transport of a nitrogen-rich ground-water plume through a glacial aquifer. Lithologic heterogeneity and vertical head gradients influenced plume movement and geometry. Nitrate was the predominant nitrogen form and oxygen was depleted in the ground-water plume. However, denitrification transformed only 2 percent of plume nitrogen...
Numerical simulation of a plume of brackish water in the Biscayne Aquifer originating from a flowing artesian well, Dade County, Florida
Michael L. Merritt
1996, Water Supply Paper 2464
A computer model that simulates a plume of brackish water in the Biscayne Aquifer has been developed. Simulations showed the remnant plume moving generally south-southeastward after 1985 and gradually dissipating. The plume of brackish water (originating from a well drilled in 1944) will be completely dispersed between 1994 and 2003....
Hydrology of the Wolf Branch sinkhole basin, Lake County, east-central Florida
D. M. Schiffer
1996, Open-File Report 96-143
A 4-year study of the hydrology of the Wolf Branch sinkhole basin in Lake County, Florida, was conducted from 1991-95 by the U.S. Geological Survey to provide information about the hydrologic characteristics of the drainage basin in the vicinity of Wolf Sink. Wolf Branch drains a 4.94 square mile area...
Stormwater-runoff data, Madison, Wisconsin, 1993-94
R.J. Waschbusch
1996, Open-File Report 95-733
Section 402(P) of the Water Quality Control Act of 1987 requires that municipalities with a population of 100,000 or more obtain permits to discharge stormwater runoff and to control its quality. Monitoring and sampling of stormwater runoff from seven drainage basins in Madison, Wis., was performed from April 1993 through...