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Approximate changes in water levels in wells completed in the Chicot and Evangeline aquifers, 1977-92 and 1991-92, and measured compaction, 1973-91, in the Houston-Galveston region, Texas
Mark C. Kasmarek, Dana L. Barbie, Al Campodonico
1992, Open-File Report 92-66
This report is one in a series of reports that depict water-level changes since 1977 and compaction of subsurface material since 1973.  The report was prepared in cooperation with the Harris-Galveston Coastal Subsidence District and the City of Houston, and presents maps showing the approximate changes in water-levels in wells...
Map showing mineral resource assessment for vein and replacement deposits of gold, silver, copper, lead, zinc, manganese, and tungsten in the Butte 1° x 2° quadrangle, Montana
J. E. Elliott, C. A. Wallace, G. K. Lee, J.C. Antweiler, D. J. Lidke, L. C. Rowan, W. F. Hanna, C. M. Trautwein, John L. Dwyer, S. H. Moll
1992, IMAP 2050-D
The purpose of this report is to assess the potential for undiscovered vein and replacement deposits of gold, silver, copper, lead, zinc, manganese, and tungsten in the Butte 1° x 2° quadrangle. This quadrangle, in west-central Montana, is one of the most mineralized and productive regions in the United States....
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...
Disappearing coastal wetlands
James B. Johnston, Donald W. Field, Anthony J. Reyer
1992, Conference Paper, Stemming the tide of coastal fish habitat loss: Proceedings of a symposium on conservation of coastal fish habitat
No abstract available....
Modelling the bathymetry of the Antarctic continental shelf
Uri S. ten Brink, William P. Rogers, R. M. Kirkham
1992, Conference Paper, Recent progress in Antarctic Earth Science
Continental shelves are typically covered by relatively shallow waters (<200 m) which deepen gradually from the coast to the shelf edge. The continental shelf around Antarctica is deeper than normal (400-700m) and is characterized in many areas by a nearshore trough (up to 1 km deep) that gradually shallows toward...
Management of habitat for breeding and migrating shorebirds in the Midwest
Jan Eldridge
1992, Fish and Wildlife Leaflet 13.2.14
Shorebirds have always relied on the extensive network of natural wetlands from Texas to North Dakota. This network has now been fractured by wetland drainage and agriculture to the point where suitable wetlands are absent in much of the Midwest. Habitat loss and the resulting risk of population decline highlight...
Recovery of benthic-invertebrate communities in the White River near Indianapolis, Indiana, USA, following implementation of advanced treatment of municipal wastewater
Charles G. Crawford, David J. Wangsness
1992, Archiv fur Hydrobiologie (126) 67-84
The City of Indianapolis, Indiana, USA, completed construction of advanced-wastewater-treatment systems to enlarge and upgrade existing secondary-treatment processes at the City’s two municipal wastewater-treatment plants in 1983. These plants discharge their effluent to the White River. A study was begun in 1981 to evaluate the effects of municipal wastewater on...
Semi-implicit finite difference methods for three-dimensional shallow water flow
Vincenzo Casulli, Ralph T. Cheng
1992, International Journal for Numerical Methods in Fluids (15) 629-648
A semi-implicit finite difference method for the numerical solution of three-dimensional shallow water flows is presented and discussed. The governing equations are the primitive three-dimensional turbulent mean flow equations where the pressure distribution in the vertical has been assumed to be hydrostatic. In the method of solution a minimal degree...
The Great Ice Age
Louis L. Ray
1992, Report
The Great Ice Age, a recent chapter in the Earth's history, was a period of recurring widespread glaciations. During the Pleistocene Epoch of the geologic time scale, which began about a million or more years ago, mountain glaciers formed on all continents, the icecaps of Antarctica and Greenland were more...
Ecology of playa lakes
David A. Haukos, Loren M. Smith
1992, Fish and Wildlife Leaflet 13.3.7
Between 25,000 and 30,000 playa lakes are in the playa lakes region of the southern high plains (Fig. 1). Most playas are in west Texas (about 20,000), and fewer, in New Mexico, Oklahoma, Kansas, and Colorado. The playa lakes region is one of the most intensively cultivated areas of North...