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Evaluation of surface geophysical methods for collection of hydrogeologic data in the Nebraska Sand Hills region
M. J. Ellis, R.A. Hiergesell
1985, Water-Resources Investigations Report 85-4195
The practicality of using surface geophysical methods for obtaining geohydrologic data in the Nebraska Sand Hills region was studied during the summer of 1984. Seismic refraction and electrical-resistivity equipment were used, because an evaluation of geohydrologic data indicated that results of surveys made with this equipment probably would yield the...
Sources of water and nitrogen to the Widefield Aquifer, southwestern El Paso County, Colorado
Patrick Edelmann, Doug Cain
1985, Water-Resources Investigations Report 85-4162
The Widefield aquifer near Colorado Springs, Colorado, is recharged primarily by Fountain Creek and, to a lesser extent, by infiltration and percolation of water from the land surface and from groundwater inflow. During the past 20 to 30 years, concentrations of nitrate (as nitrogen) in the Widefield aquifer have increased...
Phytoplankton Abundance and Generic Composition Data for the Potomac River and Estuary, Maryland
R.R.H. Cohen, S.O. Pollock, V.E. Stoelzel, K.E. Boulukos
1985, Open-File Report 84-859
Phytoplankton of the Potomac River and Estuary were counted and identified to the generic level. Double-blind precision tests for an individual counter yielded a standard deviation that was * 10 percent of the mean. Differences between three counters exceeded * 10 percent, and a curve could be fit to calibration...
Potentiometric surface of the upper Floridan Aquifer, west-central Florida, May 1985
G. L. Barr
1985, Open-File Report 85-482
A May 1985 potentiometric surface map of the Upper Floridan aquifer in west-central Florida depicts the annual low water-level period. Most areas of west-central Florida were experiencing drought conditions and water levels were at or approaching near-record low levels. Water levels in most wells measured in May 1985 were lower...
Federal-State Cooperative Program in Kansas, seminar proceedings, July 1985
T.L. Huntzinger
1985, Open-File Report 85-641
During the past few years, water-resource management in Kansas has undergone reorientation with the creation of the Kansas Water Authority and the Kansas Water office. New thrusts toward long-term goals based on the Kansas State Water plan demand strong communication and coordination between all water-related agencies within the State. The...
A two-constituent solute-transport model for ground water having variable density
W. E. Sanford, Leonard F. Konikow
1985, Water-Resources Investigations Report 85-4279
A numerical model has been developed to simulate solute transport and dispersion of either one or two constituents in groundwater where there is two-dimensional, density-dependent flow. The model is a modified version of the one documented by Konikow and Bredehoeft (1978), which uses finite-difference methods and the method of characteristics...
Water-resources activities of the U.S. Geological Survey in Nebraska, 1984
J.E. McKinney
1985, Open-File Report 85-181
The State of Nebraska has a greater abundance of water than most of the surrounding States. The major water issues in the State concern the management of these water resources in regard to their availability areally across the State and temporally over the changing seasons and cycles of weather. Management...