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Page 1925, results 48101 - 48125

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Description and comparison of selected models for hydrologic analysis of ground-water flow, St. Joseph River basin, Indiana
J. G. Peters
1987, Water-Resources Investigations Report 86-4199
The Indiana Department of Natural Resources (IDNR) is developing water-management policies designed to assess the effects of irrigation and other water uses on water supply in the basin. In support of this effort, the USGS, in cooperation with IDNR, began a study to evaluate appropriate methods for analyzing the effects...
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,...
Statistical analysis of surface-water-quality data in and near the coal-mining region of southwestern Indiana, 1957-80
Jeffrey D. Martin, Charles G. Crawford
1987, Water Supply Paper 2291
The Surface Mining Control and Reclamation Act of 1977 requires that applications for coal-mining permits contain information about the water quality of streams at and near a proposed mine. To meet this need for information, streamflow, specific conductance, pH, and concentrations of total alkalinity, sulfate, dissolved solids, suspended solids, total...
Measuring and computing natural ground-water recharge at sites in south-central Kansas
M.A. Sophocleous, C. A. Perry
1987, Water-Resources Investigations Report 87-4097
To measure the natural groundwater recharge process, two sites in south-central Kansas were instrumented with sensors and data microloggers. The atmospheric-boundary layer and the unsaturated and saturated soil zones were monitored as a single regime. Direct observations also were used to evaluate the measurements. Atmospheric sensors included an anemometer, a...
Water resources data for Mississippi, water year 1986
E.J. Tharpe, M.L. Plunkett, F. Morris, W. T. Oakley
1987, Water Data Report MS-86-1
Water resources data for the 1986 water year for Mississippi consist of records of stage, discharge, and water quality of streams; stage, and water quality of lakes and reservoirs; and water levels and water quality of ground-water wells. This report contains records of water discharge at 71 gaging stations; stage...
Selected papers in the hydrologic sciences, 1986
Seymour Subitzky
1987, Water Supply Paper 2310
Water-quality data from long-term (24 years), fixed- station monitoring at the Cape Fear River at Lock 1 near Kelly, N.C., and various measures of basin development are correlated. Subbasin population, number of acres of cropland in the subbasin, number of people employed in manufacturing, and tons of fertilizer applied in...
A review of circulation and mixing studies of San Francisco Bay, California
Lawrence H. Smith
1987, Circular 1015
A description of the major characteristics and remaining unknowns of circulation and mixing in San Francisco Bay has been constructed from a review of published studies. From a broad perspective San Francisco Bay is an ocean-river mixing zone with a seaward flow equal to the sum of the river inflows...
The effects of vertical motion on the performance of current meters
K.G. Thibodeaux, J. C. Futrell II
1987, Water-Resources Investigations Report 87-4147
A series of tests to determine the correction coefficients for Price type AA and Price type OAA current meters, when subjected to vertical motion in a towing tank, have been conducted. During these tests, the meters were subjected to vertical travel that ranged from 1.0 to 4.0 ft and vertical...
Effects of land use on ground-water quality in central Florida — Preliminary results: U.S. Geological Survey Toxic Waste — Ground-water Contamination Program
A. T. Rutledge
1987, Water-Resources Investigations Report 86-4163
Groundwater is the principal source of drinking water in central Florida. The most important hydrogeologic unit is the Floridan aquifer system, consisting of fractured limestone and dolomite limestone. Activities of man in areas of recharge to the Floridian aquifer system that may be affecting groundwater quality include: (1) the use...
Potentiometric surface of the upper Floridan aquifer in the St. Johns River Water Management District and vicinity, Florida, September 1987
L. A. Bradner
1987, Open-File Report 87-688
This map shows the potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity for September 1987. The Upper Floridan aquifer is the principal source of potable water in the area. Water level measurements were made on approximately 1,000 wells and on several...
Potentiometric surface of the upper Floridan aquifer in the St. Johns River Water Management District and vicinity, Florida, September 1986
R. M. Spechler
1987, Open-File Report 87-36
This map shows the potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity for September 1986. The Upper Floridan aquifer is the principal source of potable water in the area. Water level measurements were made on approximately 1,000 wells and on several...