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Page 3319, results 82951 - 82975

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Nutrient and suspended-sediment concentrations, trends, loads, and yields from the nontidal part of the Susquehanna, Potomac, Patuxent, and Choptank rivers, 1985-96
Linda C. Darrell, Brenda F. Majedi, Joy S. Lizarraga, Joel D. Blomquist
1999, Water-Resources Investigations Report 98-4177
The Chesapeake Bay River-Input Monitoring Program was established to characterize the water quality of four major rivers in Maryland, and to quantify the load and the long-term trends in concentrations of nutrients (nitrogen and phosphorus) and suspended sediment transported from the nontidal part of each river to the Chesapeake Bay....
Evaluation of water quality and bulk atmospheric deposition in the Guanella Pass area, Clear Creek and Park Counties, Colorado, water year 1995
Michael R. Stevens
1999, Water-Resources Investigations Report 98-4193
A study of water quality and bulk atmospheric deposition in the Guanella Pass area during water year 1995 (October 1994 to September 1995) has provided information to characterize conditions in the South Clear Creek and Geneva Creek Basins about 40 miles west of Denver, Colorado, prior to a possible roadreconstruction project. Analytical results of water samples collected from streams,...
Simulation of the effects of development of the ground-water flow system of Long Island, New York
Herbert T. Buxton, Douglas A. Smolensky
1999, Water-Resources Investigations Report 98-4069
Extensive development on Long Island since the late 19th century and projections of increased urbanization and ground-water use makes effective water-resource management essential for preservation of the island's hydrologic environment and maintenance of a reliable source of water supply. This report presents results of a ground-water flow simulation analysis of...
Hydrogeologic investigations of the Sierra Vista subwatershed of the Upper San Pedro Basin, Cochise County, southeast Arizona
Donald R. Pool, Alissa L. Coes
1999, Water-Resources Investigations Report 99-4197
The hydrogeologic system in the Sierra Vista subwatershed of the Upper San Pedro Basin in southeastern Arizona was investigated for the purpose of developing a better understanding of stream-aquifer interactions. The San Pedro River is an intermittent stream that supports a narrow corridor of riparian vegetation. Withdrawal of ground water...
Great Salt Lake, Utah
Doyle W. Stephens, Joe F. Gardner
1999, Water-Resources Investigations Report 1999-4189
This document is intended as a source of general information and facts about Great Salt Lake, Utah. This U.S. Geological Survey information sheet answers frequently asked questions about Great Salt Lake. Topics include: History, salinity, brine shrimp, brine flies, migratory birds, and recreation. Great Salt Lake, the shrunken remnant of...
The potential for saltwater intrusion in the Potomac aquifers of the York-James Peninsula, Virginia
Barry S. Smith
1999, Water-Resources Investigations Report 98-4187
The most productive aquifers of the Virginia Coastal Plain are in the Potomac Formation. Water supplies in the Potomac aquifers are impaired, however, by saltwater in some areas. A two-dimensional, densitydependent, solute-transport model was used to investigate saltwater movement in the Potomac aquifers and the potential for saltwater intrusion or...
Element concentrations in bed sediment of the Yellowstone River basin, Montana, North Dakota, and Wyoming — A retrospective analysis
D. A. Peterson, R. B. Zelt
1999, Water-Resources Investigations Report 99-4185
Chemical data for bed sediment were analyzed as part of the U.S. Geological Survey National Water-Quality Assessment Program investigation of the Yellowstone River Basin in parts of Montana, North Dakota, and Wyoming. The primary data set consisted of about 13,000 samples collected during 1974-79 for the National Uranium Resource Evaluation...
Influence of land use and open-water wetlands on water quality in the Lake Wallenpaupack basin, northeastern Pennsylvania
James I. Sams III, Rick L. Day, John M. Stiteler
1999, Water-Resources Investigations Report 98-4186
The recreational value of Lake Wallenpaupack, along with its proximity to the New York and New Jersey metropolitan areas, has resulted in residential development in parts of the watershed. Some of these developments encroach on existing ponds, lakes, and wetlands and result in the conversion of forest land to residential...
Simulation of freshwater-saltwater interfaces in the Brooklyn-Queens aquifer system, Long Island, New York
Angelo L. Kontis
1999, Water-Resources Investigations Report 98-4067
The seaward limit of the fresh ground-water system underlying Kings and Queens Counties on Long Island, N.Y., is at the freshwater-saltwater transition zone. This zone has been conceptualized in transient-state, three-dimensional models of the aquifer system as a sharp interface between freshwater and saltwater, and represented as a stationary, zero...
Characteristics of fractures in crystalline bedrock determined by surface and borehole geophysical surveys, eastern surplus superfund site, Meddybemps, Maine
Bruce P. Hansen, Janet Radway Stone, John W. Lane Jr.
1999, Water-Resources Investigations Report 99-4050
Surface and borehole geophysical methods were used to determine fracture orientation in crystalline bedrock at the Eastern Surplus Superfund Site in Meddybemps, Maine. Fracture-orientation information is needed to address concerns about the fate of contaminants in ground water at the site. Azimuthal square-array resistivity surveys were conducted at 3 locations...
Investigation of the distribution of organochlorine and polycyclic aromatic hydrocarbon compounds in the Lower Columbia River using semipermeable-membrane devices
Kathleen A. McCarthy, Robert W. Gale
1999, Water-Resources Investigations Report 99-4051
Organochlorine and polycyclic aromatic hydrocarbon compounds are of concern in the Columbia River Basin because of their adverse effects on fish and wildlife. Because these compounds can have important biological consequences at concentrations well below the detection limits associated with conventional water-sampling techniques, we used semipermeable membrane devices (SPMDs) to...