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Page 1427, results 35651 - 35675

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Hydrology and potential effects of mining in the Quitchupah and Pines coal-lease tracts, central Utah
Susan A. Thiros, G. E. Cordy
1991, Water-Resources Investigations Report 90-4084
Bydrologic data were collected for the proposed Quitchupah and Pines coal-lease tracts in Sevier and Bnery Counties, Utah, in order to describe the hydrology and potential effects of mining on the hydrologic system. The Quitchupah and Pines coal-lease tracts are near the Southern Utah Fuel Company coal mine in an...
Documentation of a computer program to simulate aquifer-system compaction using the modular finite-difference ground-water flow model
S. A. Leake, David E. Prudic
1991, Techniques of Water-Resources Investigations 06-A2
Removal of ground water by pumping from aquifers may result in compaction of compressible fine-grained beds that are within or adjacent to the aquifers. Compaction of the sediments and resulting land subsidence may be permanent if the head declines result in vertical stresses beyond the previous maximum stress. The process...
Factors affecting the recognition of faults exposed in exploratory trenches
Manuel G. Bonilla, James J. Lienkaemper
1991, Bulletin 1947
Trenching-a widely used method for evaluating fault activity-has limitations that can mislead investigators. Some segments of fault strands in trench walls may not be visible, and this nonvisibility can lead to incorrect interpretations of time of most recent displacement and recurrence intervals on a fault. We examined the logs of...
Geochemistry of ground water in alluvial basins of Arizona and adjacent parts of Nevada, New Mexico, and California
Frederick N. Robertson
1991, Professional Paper 1406-C
Chemical and isotope analyses of ground water from 28 basins in the Basin and Range physiographic province of Arizona and parts of adjacent States were used to evaluate ground-water quality, determine processes that control ground-water chemistry, provide independent insight into the hydrologic flow system, and develop information transfer. The area...
Selected water-quality characteristics in the upper Mississippi River basin, Royalton to Hastings, Minnesota
M.R. Have
1991, Water-Resources Investigations Report 88-4053
The upper Mississippi River basin from Royalton to Hastings, Minnesota, includes seven subbasins in east-central Minnesota that cover an area of 8,500 square miles. Results of a study, using data from the Minnesota Pollution Control Agency, Metropolitan Waste Control Commission, and the U.S. Geological Survey, indicate that selected water-quality characteristics...
Hydrologic provinces of Michigan
S. J. Rheaume
1991, Water-Resources Investigations Report 91-4120
This report presents the results of a study by the U.S. Geological Survey, in cooperation with the Michigan Department of Natural Resources, Geological Survey Division, to describe the statewide hydrologic variations in Michigan's water resources. Twelve hydrologic provinces, which are based on similarities in aquifer lithology, yield, recharge, and ground-water-...
Surface water quality assessment of the Upper Illinois River basin in Illinois, Indiana, and Wisconsin: Geochemical data for fine-fraction streambed sediment from high- and low-order streams, 1987
John A. Colman, R. F. Sanzolone
1991, Open-File Report 90-571
Geochemical data are presented from a synoptic survey of 46 elements in fine-fraction streambed sediments of the Upper Illinois River Basin during the fall of 1987. The survey was a component study of the Illinois pilot project of the U.S. Geological Survey's National Water-Quality Assessment program. Most of the sampling...
Geochemical relations and distribution of selected trace elements in ground water of the northern part of the western San Joaquin Valley, California
Neil M. Dubrovsky, John M. Neil, Mary C. Welker, Kristin D. Evenson
1991, Water Supply Paper 2380
Water samples were collected from 44 wells in the northern part of the western San Joaquin Valley, California, between March and July 1985 to assess the geochemical relations and distribution of major ions and selected trace-element concentrations in ground water of the area. The ground-waterflow system consists of a semiconfined...
A C language implementation of the SRO (Murdock) detector/analyzer
James N. Murdock, Scott E. Halbert
1991, Open-File Report 87-158
A signal detector and analyzer algorithm was described by Murdock and Hutt in 1983. The algorithm emulates the performance of a human interpreter of seismograms. It estimates the signal onset, the direction of onset (positive or negative), the quality of these determinations, the period and amplitude of the signal, and...
The computer program estimate trend (ESTREND), a system for the detection of trends in water-quality data
Terry L. Schertz, Richard B. Alexander, Dane J. Ohe
1991, Water-Resources Investigations Report 91-4040
Computerized statistical and graphical procedures were developed for use in U.S. Geological Survey (USGS) investigations of trend in stream water-quality data. These procedures, identified as EStimate TREND (ESTREND), are described in this paper to assist USGS investigators involved in multiple-station studies of water-quality trends. Additional discussion focuses on certain statistical...