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Page 3191, results 79751 - 79775

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Assessment of the effect of road construction and other modifications on surface-water flow at St. Vincent National Wildlife Refuge, Franklin County, Florida
J. Hal Davis, Michael F. Mokray
2000, Water-Resources Investigations Report 2000-4007
St. Vincent National Wildlife Refuge is managed by the U.S. Fish and Wildlife Service (USFWS). The refuge was acquired in 1968 from a private land owner and occupies all of St. Vincent Island, a barrier island located off the southern coast of the Florida Panhandle near Apalachicola (fig. 1). The...
Techniques for estimating magnitude and frequency of peak flows for Pennsylvania streams
Marla H. Stuckey, Lloyd A. Reed
2000, Water-Resources Investigations Report 2000-4189
Regression equations for estimating the magnitude and frequency of floods on ungaged streams in Pennsylvania with drainage areas less that 2,000 square miles were developed on the basis of peak-flow data collected at 313 streamflow-gaging stations. All streamflow-gaging stations used in the development of the equations had 10 or more...
Methods for estimating low-flow statistics for Massachusetts streams
Kernell G. Ries III, Paul J. Friesz
2000, Water-Resources Investigations Report 2000-4135
Methods and computer software are described in this report for determining flow duration, low-flow frequency statistics, and August median flows. These low-flow statistics can be estimated for unregulated streams in Massachusetts using different methods depending on whether the location of interest is at a streamgaging station, a low-flow partial-record station,...
Estimation and comparison of potential runoff-contributing areas in Kansas using topographic, soil, and land-use information
Kyle E. Juracek
2000, Water-Resources Investigations Report 2000-4177
Digital topographic, soil, and land-use information was used to estimate potential runoff-contributing areas in Kansas. The results were used to compare 91 selected subbasins representing slope, soil, land-use, and runoff variability across the State. Potential runoff-contributing areas were estimated collectively for the processes of infiltration-excess and saturation-excess overland flow using...
Concentrations of selected trace elements in fish tissue and streambed sediment in the Clark Fork-Pend Oreille and Spokane River basins, Washington, Idaho, and Montana, 1998
Terry R. Maret, K. D. Skinner
2000, Water-Resources Investigations Report 2000-4159
Fish tissue and bed sediment samples were collected from 16 stream sites in the Northern Rockies Intermontane Basins study area in 1998 as part of the U.S. Geological Survey National Water-Quality Assessment Program. Bed sediment samples were analyzed for 45 trace elements, and fish livers and sportfish fillets were analyzed...
Quality-assurance results for routine water analyses in U.S. Geological Survey laboratories, water year 1998
Amy S. Ludtke, Mark T. Woodworth, Philip S. Marsh
2000, Water-Resources Investigations Report 2000-4176
The U.S. Geological Survey operates a quality-assurance program based on the analyses of reference samples for two laboratories: the National Water Quality Laboratory and the Quality of Water Service Unit. Reference samples that contain selected inorganic, nutrient, and low-level constituents are prepared and submitted to the laboratory as disguised routine...
Physical characteristics of stream subbasins in the Long Prairie River basin, central Minnesota
Christopher A. Sanocki, Brian C. Fischer
2000, Open-File Report 2000-232
Data that describe the physical characteristics of stream subbasins upstream from selected sites on streams in the Long Prairie River Basin, located in central Minnesota, are presented in this report. The physical characteristics are the drainage area of the subbasin, the percentage area of the subbasin covered only by lakes,...
Method of analysis and quality-assurance practices for determination of pesticides in water by solid-phase extraction and capillary-column gas chromatography/mass spectrometry at the U.S. Geological Survey California District Organic Chemistry Laboratory, 1996-99
Kathryn L. Crepeau, Lucian M. Baker, Kathryn Kuivila
2000, Open-File Report 2000-229
A method of analysis and quality-assurance practices were developed to study the fate and transport of pesticides in the San Francisco Bay-Estuary by the U.S. Geological Survey. Water samples were filtered to remove suspended-particulate matter and pumped through C-8 solid-phase extraction cartridges to extract the pesticides. The cartridges were dried...
Hydrogeology of the regional aquifer near Flagstaff, Arizona, 1994-97
Donald J. Bills, Margot Truini, Marilyn E. Flynn, Herbert A. Pierce, Rufus D. Catchings, Michael J. Rymer
2000, Water-Resources Investigations Report 2000-4122
Sandstones, siltstones, and limestones that are Pennsylvanian to Permian in age underlie the southern part of the Colorado Plateau near Flagstaff, Arizona, and contain a complex regional aquifer that has become increasingly important as a source of water for domestic, municipal, and recreational uses. Ground-water flow in the regional aquifer is poorly understood...
Preliminary effects of streambank fencing of pasture land on the quality of surface water in a small watershed in Lancaster County, Pennsylvania
Daniel G. Galeone
2000, Water-Resources Investigations Report 2000-4205
The use of fencing to exclude pastured animals from streams has been recognized as an agricultural best-management practice. Streambank fencing was installed in a small basin within the Mill Creek Watershed of Lancaster County, Pa., during summer 1997 to evaluate the effectiveness of fencing on surface-water quality. A preliminary review...
Seismic-hazard maps for Hawaii
Fred W. Klein, A.D. Frankel, C.S. Mueller, R. L. Wesson, P. G. Okubo
2000, IMAP 2724
Probabilistic seismic hazard maps were prepared for Hawaii portraying peak horizontal ground acceleration and horizontal spectral response acceleration for 0.2, 0.3, and 1.0 second periods with probabilities of exceedance of 10% in 50 years and 2% in 50 years. This particular data set...
Delineation of groundwater recharge areas, western Cape Cod, Massachusetts
John P. Masterson, Donald A. Walter
2000, Water-Resources Investigations Report 2000-4000
The unconfined sand-and-gravel aquifer in western Cape Cod, Massachusetts, which is the sole source of water supply for the communities in the area, is recharged primarily from precipitation. The rate of recharge from precipitation is estimated to be about 26 inches per year (in/yr), or about 60 percent of the...
Use of a ground-penetrating radar system to detect pre- and post-flood scour at selected bridge sites in New Hampshire, 1996-98
Joseph R. Olimpio
2000, Water-Resources Investigations Report 2000-4035
Ground-penetrating radar was used to measure the depth and extent of existing and infilled scour holes and previous scour surfaces at seven bridges in New Hampshire from April 1996 to November 1998. Ground-penetrating-radar survey techniques initially were used by the U.S. Geological Survey to study streambed scour at 30 bridges....
Site Selection for a Deep Monitor Well, Kualapuu, Molokai, Hawaii
Delwyn S. Oki
2000, Water-Resources Investigations Report 99-4291
Management of the ground-water resources near Kualapuu on the island of Molokai, Hawaii, is hindered by the uncertainty in the vertical salinity structure in the aquifer. In the State of Hawaii, vertical profiles of ground-water salinity are commonly obtained from deep monitor wells, and these profiles are used to estimate...
Methodology for applying monitored natural attenuation to petroleum hydrocarbon-contaminated ground-water systems with examples from South Carolina
Frank H. Chapelle, John F. Robertson, James Landmeyer, Paul M. Bradley
2000, Water-Resources Investigations Report 2000-4161
Natural attenuation processes such as dispersion, advection, and biogradation serve to decrease concentrations of disssolved contaminants as they are transported in all ground-water systems.  However, the efficiency of these natural attenuation processes and the degree to which they help attain remediation goals, varies considerably from site to site.  This report...