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Page 1621, results 40501 - 40525

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Use of fathometers and electrical-conductivity probes to monitor riverbed scour at bridge piers
Donald C. Hayes, F.E. Drummond
1995, Water-Resources Investigations Report 94-4164
Two methods, a fathometer system and an electrical- conductivity probe system, were developed to monitor scour at bridge piers. The scour-monitoring systems consisted of a sensor (fathometer or electrical- conductivity probe), power supply, data logger, relay, and system program. The fathometer system was installed and tested at a bridge over...
Regional assessment of NLEAP NO3-N leaching indices
B.K. Wylie, M.J. Shaffer, M.D. Hall
1995, Journal of the American Water Resources Association (31) 399-408
Nonpoint source ground water contamination by nitrate nitrogen (NO3-N) leached from agricultural lands can be substantial and increase health risks to humans and animals. Accurate and rapid methods are needed to identify and map localities that have a high potential for contamination of shallow aquifers with NO3-N leached from agriculture....
Ground Water Atlas of the United States: Segment 10, Illinois, Indiana, Kentucky, Ohio, Tennessee
Orville B. Lloyd, William L. Lyke
1995, Hydrologic Atlas 730-K
This report provides a summary of ground-water conditions and problems in Illinois, Indiana, Kentucky, Ohio, and Tennessee, which compose Segment 10 of the Ground Water Atlas of the United States, an area of about 217,000 square miles. The definition, distribution, thickness, water-yielding, and water-quality characteristics of the principal aquifers in...
The biogeochemistry of wetlands in the San Luis Valley, Colorado: The effects of acid drainage from natural and mine sources
Larry P. Gough, Laurie S. Balistrieri, F.E. Lichte, T.M. Yanosky, Ronald C. Severson, A.S. Archuleta
1995, Report
The Summitville Mine, located near the old mining town of Summitville in Rio Grande County, Colorado, operated between July 1986 and December 1992 as a large-tonnage open-pit heap-leach gold mine. During its 6 years of existence the trace metal levels in drainage water from the mine site were elevated over...
Responses of bluegills and black crappies to dissolved oxygen, temperature, and current in backwater lakes of the upper Mississippi River during winter
B.C. Knights, Barry L. Johnson, M.B. Sandheinrich
1995, North American Journal of Fisheries Management (15) 390-399
We conducted a radiotelemetry study to examine the effects of dissolved oxygen (DO), water temperature, and current velocity on winter habitat selection by bluegills Lepomis macrochirus and black crappies Pomoxis nigromaculatus in the Finger Lakes backwater complex, Pool 5, on the upper Mississippi River. When DO was above 2 mg/L, both species selected areas...
Floods in southeast Texas, October 1994
Fred Liscum, Jeffery W. East
1995, Fact Sheet 073-94
Rainfall in southeast Texas, which ranged in amounts from about 8 to more than 28 inches during October 15–19, 1994, caused severe flooding in parts of a 38-county area. A combination of meteorological events—residual atmospheric moisture over southern Texas associated with Hurricane Rosa from the Pacific Coast of Mexico and...
Criteria for evaluating state instream-flow programs: Deciding what works
Berton Lee Lamb
1995, Journal of Water Resources Planning and Management (121) 270-274
Most states have adopted some form of instream-flow–protection program. These programs are of three types: instream-flow water rights; reservations of water for instream purposes; and conditions on consumptive water rights. No matter which type of protection program is adapted, the same question remains: How can we tell if it works?...
Chemical and isotopic methods for quantifying ground-water recharge in a regional, semiarid environment
Warren W. Wood, Ward E. Sanford
1995, Groundwater (33) 458-468
The High Plains aquifer underlying the semiarid Southern High Plains of Texas and New Mexico, USA was used to illustrate solute and isotopic methods for evaluating recharge fluxes, runoff, and spatial and temporal distribution of recharge. The chloride mass-balance method can provide, under certain conditions, a time-integrated technique for evaluation...
Echo-sounding method aids earthquake hazard studies
Water Resources Division, U.S. Geological Survey
1995, Fact Sheet 132-95
Dramatic examples of catastrophic damage from an earthquake occurred in 1989, when the M 7.1 Lorna Prieta rocked the San Francisco Bay area, and in 1994, when the M 6.6 Northridge earthquake jolted southern California. The surprising amount and distribution of damage to private property and infrastructure emphasizes the importance...
Combining the Neuman and Boulton models for flow to a well in an unconfined aquifer
Allen F. Moench
1995, Groundwater (33) 378-384
A Laplace transform solution is presented for flow to a well in a homogeneous, water-table aquifer with noninstanta-neous drainage of water from the zone above the water table. The Boulton convolution integral is combined with Darcy's law and used as an upper boundary condition to replace the condition used by...
Flood volumes in the upper Mississippi River basin, April 1 through September 30, 1993
Rodney E. Southard
1995, Circular 1120-H
Previous maximum flows on many streams and rivers were exceeded during the flood of 1993 in the upper Mississippi River Basin. Not only were peak discharges exceeded at many streamflow-gaging stations, but flood volumes were significantly higher than previous maximums. Rainfall amounts that were greater than 50 inches were recorded...
Improving electrofishing catch consistency by standardizing power
Randy W. Burkhardt, Steve Gutreuter
1995, North American Journal of Fisheries Management (15) 375-381
The electrical output of electrofishing equipment is commonly standardized by using either constant voltage or constant amperage, However, simplified circuit and wave theories of electricity suggest that standardization of power (wattage) available for transfer from water to fish may be critical for effective standardization of electrofishing. Electrofishing with standardized power...
Design of the National Water-Quality Assessment Program; occurrence and distribution of water-quality conditions
Robert J. Gilliom, William M. Alley, Martin E. Gurtz
1995, Circular 1112
The National Water-Quality Assessment Program assesses the status of and trends in the quality of the Nation's ground- and surface-water resources. The occurrence and distribution assessment component characterizes broad-scale water-quality conditions in relation to major contaminant sources and background conditions in each study area. The surface-water design focuses on streams....