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A modular finite-element model (MODFE) for areal and axisymmetric ground-water-flow problems; Part 1, Model description and user's manual
Lynn J. Torak
1992, Open-File Report 90-194
A MODular, Finite-Element digital-computer program (MODFE) was developed to simulate steady or unsteady-state, two-dimensional or axisymmetric ground-water flow. Geometric- and hydrologic-aquifer characteristics in two spatial dimensions are represented by triangular finite elements and linear basis functions; one-dimensional finite...
Modifications of the U.S. Geological Survey modular, finite-difference, ground-water flow model to read and write geographic information system files
Leonard L. Orzol, Timothy S. McGrath
1992, Open-File Report 92-50
This report documents modifications to the U.S. Geological Survey modular, three-dimensional, finite-difference, ground-water flow model, commonly called MODFLOW, so that it can read and write files used by a geographic information system (GIS). The modified model program is called MODFLOWARC. Simulation programs such as MODFLOW generally require large amounts of...
Accounting System for Water Use by Vegetation in the Lower Colorado River Valley
Sandra J. Owen-Joyce
1992, Open-File Report 92-83
The Colorado River is the principal source of water in the valley of the Colorado River between Hoover Dam and the international boundary with Mexico (fig. 1). Agricultural, domestic, municipal, industrial, hydroelectric-power genera-tion, and recreation are the primary uses of river water in the valley. Most of the consumptive use...
Hydrologic data for the Big Spring basin, Clayton County, Iowa, water year 1990
Stephen J. Kalkhoff, R.L. Kuzniar, D. Kolpin, C.A. Harvey
1992, Open-File Report 92-67
Hydrologic data were collected in the Big Spring basin located in Clayton County, Iowa, during the 1990 water year. The data were collected by the U.S. Geological Survey in cooperation with the Iowa Department of Natural Resources, Geological Survey Bureau, to provide information on variation and movement of agricultural chemicals...
Hydrologic research at the Princeton, Minnesota management systems evaluation area
G. N. Delin, M.K. Landon, J. L. Anderson, R.H. Dowdy
1992, Open-File Report 92-107
The Management Systems Evaluation Area (MSEA) program is part of a multi-scale, inter-agency initiative to evaluate the effects of agricultural management systems on water quality. The program resulted from the integration of the U.S. Department of Agriculture (USDA) Research Plan for Water Quality and the U.S Geological Survey (USGS) Mid-Continent...
Ground-water level data for North Carolina, 1988-90
A.G. Strickland, R. W. Coble, L.A. Edwards, B.F. Pope
1992, Open-File Report 92-57
Continuous and periodic water-level measurements were made in 59 key wells throughout North Carolina. Additional measurements were made in 112 supplementary wells completed in Coastal Plain aquifers of the State. Changes in groundwater storage are shown in 3-year and 10-year hydrographs of selected wells in the State. The water table...