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Earth Explorer
Water Resources Division, U.S. Geological Survey
2000, Fact Sheet 083-00
The U.S. Geological Survey's (USGS) Earth Explorer Web site provides access to millions of land-related products, including the following: Satellite images from Landsat, advanced very high resolution radiometer (AVHRR), and Corona data sets. Aerial photographs from the National Aerial Photography Program, NASA, and USGS data sets.  Digital cartographic data from...
The history of stream gaging in Ohio
Kimberly Shaffer
2000, Fact Sheet 050-00
IntroductionStreams are a natural resource that can influence economic growth and the development of communities. They supply water for many uses, provide habitat for aquatic plants and animals, and sup-port recreational activities such as boat-ing and fishing. The amount of water (flow) in a stream — either too little or...
Water flow in the high plains aquifer in Northwestern Oklahoma
Richard R. Luckey, Noel I. Osborn, Mark F. Becker, William J. Andrews
2000, Fact Sheet 081-00
The High Plains is a major agricultural area, supported primarily by water from the High Plains aquifer, which is used to irrigate wheat and corn and to raise cattle and swine. The U.S. Geological Survey (USGS) and the Oklahoma Water Resources Board (OWRB) began a study of the High Plains...
Mercury contamination from historic gold mining in California
Charles N. Alpers, Michael P. Hunerlach
2000, Fact Sheet 061-00
Mercury contamination from historic gold mines represents a potential risk to human health and the environment. This fact sheet provides background information on the use of mercury in historic gold mining and processing operations in California, and describes a new USGS project that addresses the potential risks associated with mercury...
A compartmentalized solute transport model for redox zones in contaminated aquifers: 2. Field‐scale simulations
Robert H. Abrams , Keith Loague
2000, Water Resources Research (36) 2015-2029
This paper, the second of two parts [see Abrams and Loague, this issue], reports the field‐scale application of COMPTRAN (compartmentalized solute transport model) for simulating the development of redox zones. COMPTRAN is fully developed and described in the companion paper. Redox zones, which are often delineated by the relative concentrations of...
Borehole-radar methods: Tools for characterization of fractured rock
Kamini Singha, Kari Kimball, John W. Lane Jr.
2000, Fact Sheet 054-00
Locating and characterizing bedrock fractures and lithologic changes is an important component of studies of ground water supply and contamination in fractured-rock aquifers. Borehole-radar reflection methods provide information on the location, orientation, and lateral extent of fracture zones that intersect the borehole, and can identify fractures in the rock surrounding...
Trout Lake, Wisconsin: A water, energy, and biogeochemical budgets program site
John F. Walker, Thomas D. Bullen
2000, Fact Sheet 161-99
The Trout Lake Watershed is in the Northern Highlands Lake District in north-central Wisconsin. The study area includes four subbasins with five lakes and two bog lakes. The objectives of the Trout Lake WEBB project are to (1) describe processes controlling water and solute fluxes in the Trout Lake watershed,...
Height changes in the epicentral region preceding the January 17, 1994 Northridge earthquake
Robert O. Castle, Robert F. Packard, Laura B. Dinitz
2000, Open-File Report 2000-2
Analysis of the results of repeated levelings through the epicentral region of the Mw 6.7, 1994 Northridge earthquake has disclosed the occurrence of differential uplift in this area that preceded the earthquake. Although the distribution of the relevant vertical-control data is somewhat sparse, in both space and time, those data...
A compartmentalized solute transport model for redox zones in contaminated aquifers: 1. Theory and development
Robert H. Abrams , Keith Loague
2000, Water Resources Research (36) 2001-2013
This paper, the first of two parts [see Abrams and Loague, this issue], takes the compartmentalized approach for the geochemical evolution of redox zones presented by Abrams et al. [1998] and embeds it within a solute transport framework. In this paper the compartmentalized approach is generalized to facilitate the description of its...
The Sun and climate
Water Resources Division, U.S. Geological Survey
2000, Fact Sheet 095-00
Many geologic records of climatic and environmental change based on various proxy variables exhibit distinct cyclicities that have been attributed to extraterrestrial forcing. The best known of these are the changes in Earth’s orbital geometry called Milankovitch Cycles, with periodicities of tens to hundreds of thousands of years. However, many...
Panola Mountain, Georgia: A Water, Energy, and Biogeochemical Budgets Program Site
Norman E. Peters, Richard P. Hooper, Thomas G. Huntington, Brent T. Aulenback
2000, Fact Sheet 162-99
The Panola Mountain Research Watershed (PMRW) is a 41-hectare forested watershed in the southern Piedmont physiographic province near Atlanta, Georgia. The watershed contains a naturally regenerated second-growth forest on abandoned agricultural land, typical of the Piedmont. Research at PMRW has focused on how streamflow is generated, and in particular, on how water and solutes move...
Overview of the Texas Source Water Assessment Project
Randy L. Ulery
2000, Fact Sheet 101-00
The 1996 Amendments to the Safe Drinking Water Act require, for the first time, that each state prepare a source water assessment for all PWS. Previously, Federal regulations focused on sampling and enforcement with emphasis on the quality of delivered water. These Amendments emphasize the importance of protecting the source...
Invisible CO2 gas killing trees at Mammoth Mountain, California
Michael L. Sorey, Christopher D. Farrar, Terrance M. Gerlach, Kenneth A. McGee, William C. Evans, Elizabeth M. Colvard, David P. Hill, Roy A. Bailey, John D. Rogie, James W. Hendley II, Peter H. Stauffer
2000, Fact Sheet 172-96
Since 1980, scientists have monitored geologic unrest in Long Valley Caldera and at adjacent Mammoth Mountain, California. After a persistent swarm of earthquakes beneath Mammoth Mountain in 1989, geologists discovered that large volumes of carbon dioxide (CO2 ) gas were seeping from beneath this volcano. This gas is killing trees...