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Page 1248, results 31176 - 31200

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Studies of the San Francisco Bay, California, estuarine ecosystem regional monitoring program results, 1996
Jelriza I. Baylosis, Jody L. Edmunds, Brian E. Cole, James E. Cloern
1997, Open-File Report 97-598
As part of a regional monitoring program, water samples were collected in the San Francisco Bay estuary during 21 cruises from January through December 1996. Conductivity, temperature, light attenuation, turbidity, oxygen, and in-vivo chlorophyll fluorescence were measured longitudinally and vertically in the main channel of the estuary from south of...
Spring contributions to water quantity and nitrate loads in the Suwannee River during base flow in July 1995
J. R. Pittman, H. H. Hatzell, E. T. Oaksford
1997, Water-Resources Investigations Report 97-4152
The Suwannee River flows through an area of north-central Florida where ground water has elevated nitrate concentrations. A study was conducted to determine how springs and other ground-water inflow affect the quantity and quality of water in the Suwannee River. The study was done on a 33-mile (mi) reach of...
Nitrate in ground water and stream base flow in the lower Susquehanna River Basin, Pennsylvania and Maryland
Bruce D. Lindsey, Connie A. Loper, Robert A. Hainly
1997, Water-Resources Investigations Report 97-4146
High concentrations of nitrate in both ground and surface water have been identified as a significant water-quality issue in the Lower Susquehanna River Basin. This report uses data collected by the National Water Quality Assessment (NAWQA) Program in the basin and compares nitrate concentrations found in ground water and surface...
Effect of faulting on ground-water movement in the Death Valley Region, Nevada and California
Claudia C. Faunt
1997, Water-Resources Investigations Report 95-4132
This study characterizes the hydrogeologic system of the Death Valley region, an area covering approximately 100,000 square kilometers. The study also characterizes the effects of faults on ground-water movement in the Death Valley region by synthesizing crustal stress, fracture mechanics, and structural geologic data. The geologic conditions are typical of...
Stream habitat characteristics of fixed sites in the western Lake Michigan drainages, Wisconsin and Michigan, 1993-95
F. A. Fitzpatrick, E.M. Giddings
1997, Water-Resources Investigations Report 95-4211-B
Habitat characteristics of 11 fixed sites in the Western Lake Michigan Drainages were examined by the U.S. Geological Survey from 1993 through 1995 as part of the ecological assessment of the National Water-Quality Assessment Program. Evaluation of habitat consisted of more than 75 measurements at three spatial levels: drainage basin,...
Nitrate (NO2+NO3–N) in ground water of the Upper Snake River basin, Idaho and western Wyoming, 1991–95
Michael G. Rupert
1997, Water-Resources Investigations Report 97-4174
Factors related to contamination of ground water by dissolved nitrite plus nitrate as nitrogen (NO2+NO3-N) in parts of the upper Snake River Basin were evaluated at regional and local scales. Regional-scale relations between NO2+NO3-N concentrations and depth to first-encountered ground water, land use, precipitation, and soils were evaluated using a...
Fish communities of fixed sites in the Western Lake Michigan Drainages, Wisconsin and Michigan, 1993-95
D. J. Sullivan
1997, Water-Resources Investigations Report 95-4211-C
Fish communities were surveyed at 20 wadable stream sites during 1993-95 as part of the U.S. Geological Survey's (USGS) National Water- Quality Assessment (NAWQA) Program's assessment of the Western Lake Michigan Drainages. Part of the NAWQA design is to incorporate ecological data into an overall environmental assessment. Collection of fish-community...
Water-quality trends for streams and reservoirs in the Research Triangle area of North Carolina, 1983-95
C.J. Childress, Neeti Bathala
1997, Water-Resources Investigations Report 97-4061
Water-quality and streamflow monitoring data, collected from 1983 to 1995, were analyzed for 34 stream and reservoir sites in a seven- county region within the upper Neuse and upper Cape Fear River Basins. Early data (1983-88) were compiled from U.S. Geological Survey water- quality studies and from the ambient water-quality...
Recharge areas and quality of ground water for the Glen Canyon and valley-fill aquifers, Spanish Valley area, Grand and San Juan counties, Utah
Judy I. Steiger, David D. Susong
1997, Water-Resources Investigations Report 97-4206
The Spanish Valley area in southeastern Utah (fig. 1) is experiencing a rapid increase in development of residential and business property. In this report, the Spanish Valley area refers to the geographic area shown in figures 1, 3, and 4. This area includes Moab Valley, Spanish Valley, and the mesa...
Dynamic deformations and the M6.7, Northridge, California earthquake
Joan S. Gomberg
1997, Soil Dynamics and Earthquake Engineering (16) 471-494
A method of estimating the complete time-varying dynamic formation field from commonly available three-component single station seismic data has been developed and applied to study the relationship between dynamic deformation and ground failures and structural damage using observations from the 1994 Northridge, California earthquake. Estimates from throughout the epicentral region...
Coal fields and federal lands of the conterminous United States
Laura Biewick
1997, Open-File Report 97-461
The map depicts the relationship of coal and public lands in the conterminous U. S. Multiple GIS layers are being created for the purpose of deriving estimates of how much coal is owned and administered by the Federal government. Federal coal areas have a profound effect on land-management decisions. Regulatory...
Regional water table (1996) and water-level changes in the Mojave River, the Morongo, and the Fort Irwin ground-water basins, San Bernardino County, California
Gregory O. Mendez, Allen H. Christensen
1997, Water-Resources Investigations Report 97-4160
The Mojave River, the Morongo, and the Fort Irwin ground-water basins lie in the southwestern part of the Mojave Desert Region of southern California. These basins supply ground water to local water districts, military bases, and private wells. The rapid growth in population in these basins,...
Water Budget for the Island of Molokai, Hawaii
Patricia J. Shade
1997, Water-Resources Investigations Report 97-4155
Ground-water recharge is estimated from a monthly water budget calculated using long-term average rainfall and streamflow data, synthesized pan-evaporation data, and soil characteristics. The water-budget components are defined seasonally, through the use of monthly data, and spatially by geohydrologic areas, through the use of a geographic information system model. The...
Changes in bottom-surface elevations in three reservoirs on the lower Susquehanna River, Pennsylvania and Maryland, following the January 1996 flood — Implications for nutrient and sediment loads to Chesapeake Bay
Michael J. Langland, Robert A. Hainly
1997, Water-Resources Investigations Report 97-4138
The Susquehanna River drains about 27,510 square miles in New York, Pennsylvania, and Maryland, contributes nearly 50 percent of the freshwater discharge to the Chesapeake Bay, and contributes nearly 66 percent of the annual nitrogen load, 40 percent of the phosphorus load, and 25 percent of the suspended-sediment load from...
A Hydrogeologic Map of the Death Valley Region, Nevada and California, Developed Using GIS Techniques
Claudia C. Faunt, Frank A. D’Agnese, A. Keith Turner
1997, Water-Resources Investigations Report 95-4016
In support of Yucca Mountain site characterization studies, a hydrogeologic framework was developed, and a hydrogeologic map was constructed for the Death Valley region. The region, covering approximately 100,000 km 2 along the Nevada-California border near Las Vegas, is characterized by isolated mountain ranges juxtaposed against broad, alluvium-filled valleys. Geologic...
Distribution of dissolved pesticides and other water quality constituents in small streams, and their relation to land use, in the Willamette River Basin, Oregon, 1996
Chauncey W. Anderson, Tamara M. Wood, Jennifer L. Morace
1997, Water-Resources Investigations Report 97-4268
Water quality samples were collected at sites in 16 randomly selected agricultural and 4 urban subbasins as part of Phase III of the Willamette River Basin Water Quality Study in Oregon during 1996. Ninety-five samples were collected and analyzed for suspended sediment, conventional constituents (temperature, dissolved oxygen, pH, specific conductance,...