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Page 3602, results 90026 - 90050

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Guidelines and standard procedures for studies of ground-water quality; selection and installation of wells, and supporting documentation
W.W. Lapham, F.D. Wilde, M.T. Koterba
1997, Water-Resources Investigations Report 96-4233
This is the first of a two-part report to document guidelines and standard procedures of the U.S. Geological Survey for the acquisition of data in ground-water-quality studies. This report provides guidelines and procedures for the selection and installation of wells for water-quality studies/*, and the required or recommended supporting documentation...
Method for rapid estimation of scour at highway bridges based on limited site data
S.R. Holnbeck, Charles Parrett
1997, Water-Resources Investigations Report 96-4310
Limited site data were used to develop a method for rapid estimation of scour at highway bridges. The estimates can be obtained in a matter of hours rather than several days as required by more-detailed methods. Such a method is important because scour assessments are needed to identify scour-critical...
Geophysical interpretations of the Libby thrust belt, northwestern Montana, with a section on deep folds and faults interpreted from seismic data and a section on interpretation of magnetotelluric soundings
M. Dean Kleinkopf, Jack Edward Harrison, W. D. Stanley
1997, Professional Paper 1546
Interpretations of gravity and aeromagnetic anomaly data, supplemented by results from two seismic reflection profiles and five magnetotelluric soundings, were used to study buried structure and lithology of the Libby thrust belt of northwestern Montana. The gravity anomaly data show a marked correlation with major structures. The Purcell anticlinorium and...
Study of nonpoint source nutrient loading in the Patuxent River basin, Maryland
S. D. Preston
1997, Water-Resources Investigations Report 96-4273
Study of nonpoint-source (NPS) nutrient loading in Maryland has focused on the Patuxent watershed because of its importance and representativeness of conditions in the State. Evaluation of NPS nutrient loading has been comprehensive and has included long-term monitoring, detailed watershed modeling, and synoptic sampling studies....
Evaluation of selected wells in Pennsylvania's observation-well program as of 1993
R.W. Conger
1997, Water-Resources Investigations Report 96-4319
In 1993, the U.S. Geological Survey operated 62 observation wells in 60 of Pennsylvania's 67 counties in cooperation with the Pennsylvania Department of Environmental Resources. These wells attempt to monitor an aerial extent of 45,000 square miles and penetrate 39 geologic formations or water-bearing units of 14 physiographic provinces. Some...
Episodic acidification and changes in fish diversity in Pennsylvania headwater streams
R.M. Heard, W.E. Sharpe, R.F. Carline, William G. Kimmel
1997, Transactions of the American Fisheries Society (126) 977-984
Current water chemistry and fish communities in 70 Pennsylvania streams were compared with historical records to determine whether fish species richness had declined and, if so, the possible role of acidification. First‐, second‐, and third‐order streams were selected, and stream sites sampled during the 1961–1971 survey were...
Reconnaissance of surface-water quality in the North Platte Natural Resources District, western Nebraska, 1993
G. V. Steele, J. C. Cannia
1997, Water-Resources Investigations Report 96-4316
In 1993, the U.S. Geological Survey and the North Platte Natural Resources District began a 3-year study to determine the geohydrology and water quality of the North Platte River alluvial aquifer near Oshkosh, Garden County, Nebraska. The objectives of the study were to determine the geohydrologic properties of the North...
Water withdrawal and use in Maryland, 1992-93
J. C. Wheeler
1997, Water-Resources Investigations Report 96-4314
During 1992, about 1,430 million gallons per day (Mgal/d) of freshwater was withdrawn from surface-water and ground-water sources in Maryland. Total freshwater withdrawals increased during 1993 to about 1,480 Mgal/d. Saline surface- water withdrawals for cooling condensers increased from about 5,350 Mgal/d during 1992 to...
Factors influencing stream fish recovery following a large-scale disturbance
W.E. Ensign, K.N. Leftwich, P. L. Angermeier, C.A. Dolloff
1997, Transactions of the American Fisheries Society (126) 895-907
We examined fish distribution and abundance in erosional habitat units in South Fork Roanoke River, Virginia, following a fish kill by using a reachwide sampling approach for 3 species and a representative‐reach sampling approach for 10 species. Qualitative (presence–absence) and quantitative (relative abundance) estimates of distribution and...
Geochemical analyses of ground-water ages, recharge rates, and hydraulic conductivity of the N aquifer, Black Mesa area, Arizona
Thomas J. Lopes, John P. Hoffmann
1997, Water-Resources Investigations Report 96-4190
The Navajo Nation and Hopi Tribe of the Black Mesa area, Arizona, depend on ground water from the N aquifer to meet most tribal and industrial needs. Increasing use of this aquifer is creating concerns about possible adverse effects of increased ground-water withdrawals on the water resources of the region....