Geohydrology and water quality of confined-drift aquifers in the Brooten-Belgrade area, west-central Minnesota
G. N. Delin
1990, Water-Resources Investigations Report 88-4124
Confined-drift aquifers in six aquifer zones identified in a 1,300-square-mile area of west-central Minnesota near Brooten and Belgrade range in thickness from 5 to 110 feet. Transmissivities generally range from 500 to 10,000 feet squared per day, and theoretical well yields generally range from 100 to 900 gallons per minute. Regional...
The Alaska Mineral Resource Assessment Program: Background information to accompany folio of geologic and resource maps of the Ugashik, Bristol Bay, and western part of Karluk quadrangles, Alaska
Robert L. Detterman, J. E. Case, S. E. Church, J. G. Frisken, Frederic H. Wilson, M. E. Yount
1990, Circular 1046
The Ugashik, Bristol Bay, and western part of Karluk quadrangles (1:250,000) are a part of the Alaska Peninsula in southwestern Alaska. This circular, in conjunction with a companion folio of MF-series maps, two I-series geologic maps, and three bulletins, represents the results of integrated field and laboratory studies on the...
PRECONDITIONED CONJUGATE-GRADIENT 2 (PCG2), a computer program for solving ground-water flow equations
Mary C. Hill
1990, Water-Resources Investigations Report 90-4048
This report documents PCG2 : a numerical code to be used with the U.S. Geological Survey modular three-dimensional, finite-difference, ground-water flow model . PCG2 uses the preconditioned conjugate-gradient method to solve the equations produced by the model for hydraulic head. Linear or nonlinear flow conditions may be simulated. PCG2 includes...
A conceptual weather-type classification procedure for the Philadelphia, Pennsylvania, area
Gregory J. McCabe
1990, Water-Resources Investigations Report 89-4183
A simple method of weather-type classification, based on a conceptual model of pressure systems that pass through the Philadelphia, Pennsylvania, area, has been developed. The only inputs required for the procedure are daily mean wind direction and cloud cover, which are used to index the relative position of pressure systems...
Ground-water flow and solute movement to drain laterals, western San Joaquin Valley, California; II, Quantitative hydrologic assessment
J.L. Fio, S. J. Deverel
1990, Open-File Report 90-137
Ground-water-flow modeling was used to estimate ground-water-flow paths and traveltimes to quantitatively assess the hydrologic processes affecting ground water and solute movement to drain laterals. Modeling results were used to calculate the depth distribution of ground water flowing into drain laterals at 1.8 meters (drain lateral 1) and 2.7 meters...
Appraisal of the water resources of the Skunk Creek Aquifer in Minnehaha County, South Dakota
G.L. Ohland
1990, Water-Resources Investigations Report 87-4156
The Skunk Creek aquifer, a major glacial outwash deposit in the Skunk Creek drainage basin, consists of a 30-sq-mi shallow stream connected sand and gravel aquifer in southeastern South Dakota. The aquifer thickness ranges from 1 to 74 ft. Average annual fluctuation of the water table is 2.5 ft. The...
Calibration and sensitivity analysis of a ground-water flow model of the coastal lowlands aquifer system in parts of Louisiana, Mississippi, Alabama, and Florida
Angel Martin Jr., C. D. Whiteman Jr.
1990, Water-Resources Investigations Report 89-4189
Conceptualization and analysis of ground-water flow system in the Coastal Plain of Virginia and adjacent parts of Maryland and North Carolina
John F. Harsh, Randell J. Laczniak
1990, Professional Paper 1404-F
The ground-water flow system in the Coastal Plain of Virginia and adjacent parts of Maryland and North Carolina consists of a water table aquifer and an underlying sequence of confined aquifers and intervening confining units composed of unconsolidated sand and clay. A digital flow model was developed to enhance knowledge...
Calibration of a texture-based model of a ground-water flow system, western San Joaquin Valley, California
S.P. Phillips, K.R. Belitz
1990, Open-File Report 90-573
The occurrence of selenium in agricultural drain water from the western San Joaquin Valley, California, has focused concern on the semiconfined ground-water flow system, which is underlain by the Corcoran Clay Member of the Tulare Formation. A two-step procedure is used to calibrate a preliminary model of the system for...
Ground-water levels in water year 1987 and estimated ground-water pumpage in water years 1986-87, Carson Valley, Douglas County, Nevada
D.L. Berger
1990, Open-File Report 89-70
Groundwater levels were measured at 58 wells during water year 1987 and a summary of estimated pumpage is given for water years 1986 and 1987 in Carson Valley, Douglas County, Nevada. The data were collected to provide a record of groundwater changes over the long-term and pumpage estimates that can...
How to construct seven paper models that describe faulting of the earth
Tau Rho Alpha, John C. Lahr
1990, Open-File Report 90-257-A
Mineral Resources of the Black Mountains North and Burns Spring Wilderness Study Areas, Mohave County, Arizona
James E. Conrad, Randall H. Hill, Robert C. Jachens, John T. Neubert
1990, Bulletin 1737-C
At the request of the U.S. Bureau of Land Management, approximately 19,300 acres of the Black Mountains North Wilderness Study Area (AZ-020-009) and 23,310 acres of the Burns Spring Wilderness Study Area (AZ-02D-010) were evaluated for mineral resources and mineral resource potential. In this report, the area studied is referred...
Environmental changes in the Tule Lake basin, Siskiyou and Modoc Counties, California, from 3 to 2 million years before present
David P. Adam, J. Platt Bradbury, Hugh J. Rieck, Andrei M. Sarna-Wojcicki
1990, Bulletin 1933
Pollen and diatom analyses of a core from the town of Tulelake, Siskiyou County, California, for the period between 3 and 2 Ma reveal a paleoclimatic and paleolimnologic sequence recording a long, warm time interval that lasted from about 2.9 to 2.6 Ma and had a short, cooler interval within...
Evaluation of selenium mobility in soil using sorption experiments and a numerical model, western San Joaquin Valley, California
John L. Fio, Roger Fujii, S. J. Deverel
1990, Open-File Report 90-135
Sorption experiments and a numerical model were used to assess the effects of irrigation and drainage on the depth distribution of selenite and selenate in soils from the western San Joaquin Valley, California. The sorption studies show that selenate (15 to 12,400 micrograms per liter of selenium) is not adsorbed...
Techniques for estimation of storm-runoff loads, volumes, and selected constituent concentrations in urban watersheds in the United States
Nancy E. Driver, Gary D. Tasker
1990, Water Supply Paper 2363
Urban planners and managers need information on the quantity of precipitation and the quality and quantity of run off in their cities and towns if they are to adequately plan for the effects of storm runoff from urban areas. As a result of this need, four sets of linear regression...
PROBDIST : probability distributions for modeling and simulation in the absence of data, Part A - Documentation
Robert A. Crovelli, Richard H. Balay
1990, Open-File Report 90-446-A
The computer model SHARP, a quasi-three-dimensional finite-difference model to simulate freshwater and saltwater flow in layered coastal aquifer systems
H.I. Essaid
1990, Water-Resources Investigations Report 90-4130
Geohydrology and numerical model analysis of ground-water flow in the Pullman-Moscow area, Washington and Idaho
W. E. Lum II, James L. Smoot, Dale R. Ralston
1990, Water-Resources Investigations Report 89-4103
The geohydrology of the Pullman, Washington-Moscow, Idaho area was investigated by mapping geohydrologic units, determining the distribution of hydraulic head in each unit, and determining some of the components of the water budget. This information was used to construct a three- dimensional groundwater-flow model that incorporates three layers--a surficial loess...
Mineral Resources of the Mount Nutt Wilderness Study Area, Mohave County, Arizona
Floyd Gray, Robert C. Jachens, Robert J. Miller, Robert L. Turner, Eric K. Livo, Daniel H. Knepper, John Mariano, Carl L. Almquist
1990, Bulletin 1737-D
The Mount Nutt Wilderness Study Area (AZ-020-024) is located in the Black Mountains about 15 mi west of Kingman, Arizona. At the request of the U.S. Bureau of Land Management, approximately 27,210 acres of the wilderness study area was evaluated for mineral resources (known) and mineral resource potential (undiscovered). In...
Regional evaluation of hydrologic factors and effects of pumping, St Peter-Jordan aquifer, Iowa
M. R. Burkart, Robert Buchmiller
1990, Water-Resources Investigations Report 90-4009
The St. Peter-Jordan aquifer includes the Cambrian Jordan Sandstone and the overlying Ordovician Prairie du Chien Group and St. Peter Sandstone. The aquifer is present throughout Iowa and is confined beneath other aquifers in much of the State. Information on the aquifer available from drillers and contractors, provided estimates of...
Application of digital elevation models to delineate drainage areas and compute hydrologic characteristics for sites in the James River basin, North Dakota
G.J. Wiche, S.K. Jenson, J. V. Baglio Jr., Julia O. Domingue
1990, Open-File Report 90-593
No abstract available....
Mineral resources of the Chamisa, Empedrado, and La Lena wilderness Study Areas, Sandoval and McKinley Counties, New Mexico
P.J. Modreski, G.A. Nowlan, W. F. Hanna, R.A. Schreiner
1990, Bulletin 1733-E
Preliminary geologic map of the Wadi As Sirhan Quadrangle, sheet 30C, Kingdom of Saudi Arabia
C. R. Meissner Jr., M.B. Griffin, G.P. Riddler, Marcel Van Eck, N.C. Aspinall, A.M. Farasani, S.M. Dini
1990, Open-File Report 90-263
The Wadi as Sirhan quadrangle lies in the northwestern pan of Saudi Arabia on the border with Jordan. It is located in the west-central part of the Sirhan-Turayf basin and is underlain by Silurian to Miocene-Pliocene sedimentary rocks that are partly covered by volcanic flows. The map area also contains...
Mineral resources of the Elkhorn Wilderness Study Area, Broadwater and Jefferson Counties, Montana
William R. Greenwood, Steve Ludington, William R. Miller, William F. Hanna, Karen J. Wenrich, Vivian J. Suits, John B. McHugh
1990, Bulletin 1805
The Elkhorn Wilderness Study Area in west-central Montana has a moderate to high potential for resources of porphyry-type copper and molybdenum in the western part of the area, and a moderate to high potential for resources of gold, silver, lead, and zinc in replacement and vein deposits in the eastern...
Geothermal resources of the western arm of the Black Rock Desert, northwestern Nevada: Part II, aqueous geochemistry and hydrology
A. H. Welch, A. M. Preissler
1990, Water-Resources Investigations Report 87-4062
The western arm of the Black Rock Desert, Nevada, includes several distinct hydrothermal systems, some of which exceed 150 C and may exceed 200 C at depth, determined on the basis of chemical geothermometry. The cation composition of the thermal water appears to be controlled by aluminosilicate minerals that are...
