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Publications for publication type Report and publication subtype USGS Numbered Series

Pesticides in surface water of the Mid-Atlantic region, 1997, Water-Resources Investigations Report 97-4280
Characterization of springflow in the north coast limestone of Puerto Rico using physical, chemical, and stable isotopic methods, 1997, Water-Resources Investigations Report 97-4122
Nitrate and selected pesticides in ground water of the Mid-Atlantic region, 1997, Water-Resources Investigations Report 97-4139
Water quality and chemical evolution of ground water in the Long Pine Creek area, Brown and Rock counties, Nebraska, 1993-94, 1997, Water-Resources Investigations Report 96-4095
Ground-water age dating and other tools used to assess land-use effects on water quality, 1997, Water-Resources Investigations Report 97-4150
Sedimentation history of Lago Loiza, Puerto Rico, 1953-94, 1997, Water-Resources Investigations Report 97-4108
Agricultural land-use classification using landsat imagery data, and estimates of irrigation water use in Gooding, Jerome, Lincoln, and Minidoka counties, 1992 water year, Upper Snake River basin, Idaho and western Wyoming, 1997, Water-Resources Investigations Report 97-4115
Water-quality assessment of the Trinity River Basin, Texas — Nutrients and pesticides in the watersheds of Richland and Chambers Creeks, 1993-95, 1997, Water-Resources Investigations Report 97-4132
Potentiometric surface and specific conductance of the Sparta and Memphis aquifers in eastern Arkansas, 1995, 1997, Water-Resources Investigations Report 97-4119
Characterization of fill deposits in the Calumet region of northwestern Indiana and northeastern Illinois, 1997, Water-Resources Investigations Report 96-4126
Characteristics of fish assemblages and related environmental variables for streams of the upper Snake River basin, Idaho and western Wyoming, 1993-95, 1997, Water-Resources Investigations Report 97-4087
Hydrology of the shallow aquifer and uppermost semiconfined aquifer near El Paso, Texas, 1997, Water-Resources Investigations Report 97-4263
Organochlorine compounds in fish tissue and bed sediment in the upper Snake River basin, Idaho and western Wyoming, 1992-94, 1997, Water-Resources Investigations Report 97-4080
Seismic investigation of the buried horst between the Jornada del Muerto and Mesilla ground-water basins near Las Cruces, Dona Ana County, New Mexico, 1997, Water-Resources Investigations Report 97-4147
Guide to the revised heat and solute transport simulator; HST3D, Version 2, 1997, Water-Resources Investigations Report 97-4157
Relation of ground-water flowpaths and travel time to the distribution of radium and nitrate in current and former agricultural areas of the Kirkwood-Cohansey aquifer system, New Jersey coastal plain, 1997, Water-Resources Investigations Report 96-4165 B
The ground-water system and ground-water quality in western Snohomish County, Washington, 1997, Water-Resources Investigations Report 96-4312
Techniques for estimating peak flow on small streams in Minnesota, 1997, Water-Resources Investigations Report 97-4249
Results of quality-control sampling of water, bed sediment, and tissue in the Western Lake Michigan Drainages study unit of the National Water-Quality Assessment Program, 1997, Water-Resources Investigations Report 97-4148
Urbanization and recharge in the vicinity of East Meadow Brook, Nassau County, New York: Part 2 — Effect of urban runoff on the hydrology of the headwaters of East Meadow Brook, 1989-90, 1997, Water-Resources Investigations Report 97-4063
Model-estimated ground-water recharge and hydrograph of ground-water discharge to a stream, 1997, Water-Resources Investigations Report 97-4253
Mesocosm experiments to assess factors affecting phosphorus retention and release in an extended Wisconsin wetland, 1997, Water-Resources Investigations Report 97-4272
Environmental setting and implications for water quality in the Western Lake Michigan Drainages, 1997, Water-Resources Investigations Report 97-4196
Geochemistry and microbiology of iron-related well-screen encrustation and aquifer biofouling in Suffolk County, Long Island, New York, 1997, Water-Resources Investigations Report 97-4032
Geology and hydrogeology of Cretaceous and Tertiary strata, and confinement in the vicinity of the U.S. Department of Energy Savannah River Site, South Carolina and Georgia, 1997, Water-Resources Investigations Report 97-4245
Hydrology and water quality of the Beaver Dam Wash area, Washington County, Utah, Lincoln County, Nevada, and Mohave County, Arizona, 1997, Water-Resources Investigations Report 97-4193
Estimation and analysis of nutrient and suspended-sediment loads at selected sites in the Potomac River Basin, 1993-95, 1997, Water-Resources Investigations Report 97-4154
Field screening of water quality, bottom sediment, and biota associated with irrigation drainage in the Yuma Valley, Arizona, 1995, 1997, Water-Resources Investigations Report 97-4236
Integrity of production wells and confining unit at the Naval Weapons Industrial Reserve Plant, Dallas, Texas, 1995, 1997, Water-Resources Investigations Report 97-4047
PHREEQCI: A graphical user interface for the geochemical computer program PHREEQC, 1997, Water-Resources Investigations Report 97-4222
Hydrogeologic framework and simulation of ground-water flow and travel time in the shallow aquifer system in the area of Naval Support Activity Memphis, Millington, Tennessee, 1997, Water-Resources Investigations Report 97-4228
Flood of October 1996 in southern Maine, 1997, Water-Resources Investigations Report 97-4189
Evaluation of nitrate sources using nitrogen-isotope techniques in shallow ground water within selected lake basins in the Central Lakes District, Polk and Highlands Counties, Florida, 1997, Water-Resources Investigations Report 97-4207
External quality-assurance results for the National Atmospheric Deposition Program/National Trends Network during 1994, 1997, Water-Resources Investigations Report 97-4201
Interim results of quality-control sampling of surface water for the Upper Colorado River National Water-Quality Assessment Study Unit, water years 1995-96, 1997, Water-Resources Investigations Report 97-4227
Chemical evolution and estimated flow velocity of water in the Trinity Aquifer, south-central Texas, 1997, Water-Resources Investigations Report 97-4078
Geohydrology and simulations of ground-water flow at Verona well field, Battle Creek, Michigan, 1988, 1997, Water-Resources Investigations Report 97-4068
Water resources of Bannock Creek basin, southeastern Idaho, 1997, Water-Resources Investigations Report 97-4231
Water-quality assessment of the Rio Grande Valley, Colorado, New Mexico, and Texas: Summary and analysis of water-quality data for the basic-fixed-site network, 1993-95, 1997, Water-Resources Investigations Report 97-4212
Water-quality assessment of the Lower Susquehanna River Basin, Pennsylvania and Maryland: sources, characteristics, analysis and limitations of nutrient and suspended-sediment data, 1975-90, 1997, Water-Resources Investigations Report 97-4209
Simulation of the effect of traffic barricades on backwater along U.S. Highway 54 at Jefferson City, Missouri-1993 flood on the Missouri River, 1997, Water-Resources Investigations Report 97-4213
Evaluation of the U.S. Geological Survey Ground-Water Data-Collection Program in Hawaii, 1992, 1997, Water-Resources Investigations Report 97-4232
Water quality in the E.A. Patterson Lake basin, North Dakota, June 1995 through May 1996, 1997, Water-Resources Investigations Report 97-4215
Trends in nutrient concentration and load for streams in the Mississippi River Basin, 1974-94, 1997, Water-Resources Investigations Report 97-4223
Hydrogeology and water quality of the Shell Valley Aquifer, Rolette County, North Dakota, 1997, Water-Resources Investigations Report 97-4291
Water Budget for the Iao Area, Island of Maui, Hawaii, 1997, Water-Resources Investigations Report 97-4244
Sources of contamination in an urban basin in Marquette, Michigan and an analysis of concentrations, loads, and data quality, 1997, Water-Resources Investigations Report 97-4242
Techniques for estimating peak-streamflow frequency for unregulated streams and streams regulated by small floodwater retarding structures in Oklahoma, 1997, Water-Resources Investigations Report 97-4202
Estimation of peak-discharge frequency of urban streams in Jefferson County, Kentucky, 1997, Water-Resources Investigations Report 97-4219
Analysis of bottom sediment to estimate nonpoint-source phosphorus loads for 1981-96 in Hillsdale Lake, northeast Kansas, 1997, Water-Resources Investigations Report 97-4235
Relation of distribution of radium, nitrate, and pesticides to agricultural land use and depth, Kirkwood-Cohansey aquifer system, New Jersey coastal plain, 1990-91, 1997, Water-Resources Investigations Report 96-4165 A
Detection of underground voids in Ohio by use of geophysical methods, 1997, Water-Resources Investigations Report 97-4221
Estimated water withdrawals and use in Vermont, 1995, 1997, Water-Resources Investigations Report 97-4178
Estimated water withdrawals and use in New Hampshire, 1995, 1997, Water-Resources Investigations Report 97-4177
Nutrients, suspended sediment, and pesticides in streams in the Red River of the North basin, Minnesota, North Dakota, and South Dakota, 1993-95, 1997, Water-Resources Investigations Report 97-4053
Evaluation of bridge-scour data at selected sites in Ohio, 1997, Water-Resources Investigations Report 97-4182
Effects of the 1993 flood on water levels and water quality in the Sheyenne Delta Aquifer, southeastern North Dakota, 1993-94, 1997, Water-Resources Investigations Report 97-4163
Contamination of ground water at the Tucson International Airport Area, Superfund Site, Tucson, Arizona — Overview of hydrogeologic considerations, conditions as of 1995, and cleanup efforts, 1997, Water-Resources Investigations Report 97-4200
Natural attenuation of chlorinated volatile organic compounds in a freshwater tidal wetland, Aberdeen Proving Ground, Maryland, 1997, Water-Resources Investigations Report 97-4171
Hydrogeology and water quality of a surficial aquifer underlying an urban area, Manchester, Connecticut, 1997, Water-Resources Investigations Report 97-4195
Geohydrology and Numerical Simulation of the Ground-Water Flow System of Molokai, Hawaii, 1997, Water-Resources Investigations Report 97-4176
Trace elements and synthetic organic compounds in biota and streambed sediment of the Western Lake Michigan Drainages, 1992-1995, 1997, Water-Resources Investigations Report 97-4192
Ground-water geochemistry of Kwajalein Island, Republic of the Marshall Islands, 1991, 1997, Water-Resources Investigations Report 97-4184
Hydrogeologic evaluation and numerical simulation of the Death Valley regional ground-water flow system, Nevada and California, 1997, Water-Resources Investigations Report 96-4300
Hydrogeologic interpretations of natural-gamma logs for 31 shallow wells in the Memphis, Tennessee, area, 1997, Water-Resources Investigations Report 97-4181
Subsurface flow and water yield from watersheds tributary to Eagle Valley hydrographic area, west-central Nevada, 1997, Water-Resources Investigations Report 97-4191
August median streamflows in Massachusetts, 1997, Water-Resources Investigations Report 97-4190
Water-quality assessment of part of the upper Mississippi River Basin, Minnesota and Wisconsin — Nitrogen and phosphorus in streams, streambed sediment, and ground water, 1971-94, 1997, Water-Resources Investigations Report 97-4107
Water-level changes in the High Plains Aquifer - predevelopment to 1995, 1997, Water-Resources Investigations Report 97-4081
Statistical analysis of nitrate in ground water, West Salt River Valley, Arizona, 1997, Water-Resources Investigations Report 97-4185
Stratigraphy of the unsaturated zone and the Snake River Plain Aquifer at and near the Idaho National Engineering Laboratory, Idaho, 1997, Water-Resources Investigations Report 97-4183
Water-quality assessment of part of the upper Mississippi River Basin, Minnesota and Wisconsin — Pesticides in streams, streambed sediment, and ground water, 1974-94, 1997, Water-Resources Investigations Report 97-4141
Glacier ice-volume modeling and glacier volumes on Redoubt Volcano, Alaska, 1997, Water-Resources Investigations Report 97-4187
Evaluation of the design of a regional ground-water quality monitoring network, Broward County, Florida, 1997, Water-Resources Investigations Report 97-4175
Nitrate in ground water and stream base flow in the lower Susquehanna River Basin, Pennsylvania and Maryland, 1997, Water-Resources Investigations Report 97-4146
Snow and ice volume on Mount Spurr Volcano, Alaska, 1981, 1997, Water-Resources Investigations Report 97-4142
Geodetic network to evaluate historical elevation changes and to monitor land subsidence in lower Coachella Valley, California, 1996, 1997, Water-Resources Investigations Report 97-4237
Stream habitat characteristics of fixed sites in the western Lake Michigan drainages, Wisconsin and Michigan, 1993-95, 1997, Water-Resources Investigations Report 95-4211 B
Water-quality trends for streams and reservoirs in the Research Triangle area of North Carolina, 1983-95, 1997, Water-Resources Investigations Report 97-4061
Fish communities of fixed sites in the Western Lake Michigan Drainages, Wisconsin and Michigan, 1993-95, 1997, Water-Resources Investigations Report 95-4211 C
Chemical quality of water in consolidated rock and the basin-fill aquifer, west side of the Oquirrh Mountains, Tooele County, Utah, 1997, Water-Resources Investigations Report 97-4247
Nitrate (NO2+NO3–N) in ground water of the Upper Snake River basin, Idaho and western Wyoming, 1991–95, 1997, Water-Resources Investigations Report 97-4174
Spring contributions to water quantity and nitrate loads in the Suwannee River during base flow in July 1995, 1997, Water-Resources Investigations Report 97-4152
Recharge areas and quality of ground water for the Glen Canyon and valley-fill aquifers, Spanish Valley area, Grand and San Juan counties, Utah, 1997, Water-Resources Investigations Report 97-4206
Nutrients in the surface waters of the Georgia-Florida Coastal plain study unit, 1993-95, 1997, Water-Resources Investigations Report 96-4197
Effect of faulting on ground-water movement in the Death Valley Region, Nevada and California, 1997, Water-Resources Investigations Report 95-4132
Ground-water levels in the Upper Three Runs and Gordon aquifers in the General Separations Area, Savannah River site, South Carolina, 1996, 1997, Water-Resources Investigations Report 97-4217
A comparison of drainage basin nutrient inputs with instream nutrient loads for seven rivers in Georgia and Florida, 1986-90, 1997, Water-Resources Investigations Report 97-4006
Geographical distribution and potential for adverse biological effects of selected trace elements and organic compounds in streambed sediment in the Connecticut, Housatonic, and Thames River basins, 1992-94, 1997, Water-Resources Investigations Report 97-4169
Occurrence of dissolved solids, nutrients, atrazine, and fecal coliform bacteria during low flow in the Cheney Reservoir watershed, south-central Kansas, 1996, 1997, Water-Resources Investigations Report 97-4153
Water Budget for the Island of Molokai, Hawaii, 1997, Water-Resources Investigations Report 97-4155
Air-injection testing in vertical boreholes in welded and nonwelded tuff, Yucca Mountain, Nevada, 1997, Water-Resources Investigations Report 96-4262
Flood of March 1997 in southern Ohio, 1997, Water-Resources Investigations Report 97-4149
Distribution of dissolved pesticides and other water quality constituents in small streams, and their relation to land use, in the Willamette River Basin, Oregon, 1996, 1997, Water-Resources Investigations Report 97-4268
Delineation of areas contributing recharge to municipal wells in three selected confined-glacial aquifers in Erie County, New York, 1997, Water-Resources Investigations Report 96-4229
Hydrogeology and ground-water quality at Naval Support Activity Memphis, Millington, Tennessee, 1997, Water-Resources Investigations Report 97-4158
A Hydrogeologic Map of the Death Valley Region, Nevada and California, Developed Using GIS Techniques, 1997, Water-Resources Investigations Report 95-4016
Evaluation of drawdown and sources of water in the Mississippi River alluvium caused by hypothetical pumping, Muscatine, Iowa, 1997, Water-Resources Investigations Report 97-4162
Changes in bottom-surface elevations in three reservoirs on the lower Susquehanna River, Pennsylvania and Maryland, following the January 1996 flood — Implications for nutrient and sediment loads to Chesapeake Bay, 1997, Water-Resources Investigations Report 97-4138
Urbanization and recharge in the vicinity of East Meadow Brook, Nassau County, New York: Part 4 — Water quality in the headwaters area, 1988-93, 1997, Water-Resources Investigations Report 96-4289
Hydrogeology and water chemistry of Montezuma Well in Montezuma Castle National Monument and surrounding area, Arizona, 1997, Water-Resources Investigations Report 97-4156
Hydrology, sedimentology, and biology of Ellison Park wetland at the mouth of Irondequoit Creek near Rochester, New York, 1997, Water-Resources Investigations Report 96-4269
Eutrophication potential of Payette Lake, Idaho, 1997, Water-Resources Investigations Report 97-4145
Simulation of temperature, nutrients, biochemical oxygen demand, and dissolved oxygen in the Cooper and Wando rivers near Charleston, South Carolina, 1992-95, 1997, Water-Resources Investigations Report 97-4151
Effects and distribution of iron-related well-screen encrustation and aquifer biofouling in Suffolk County, Long Island, New York, 1997, Water-Resources Investigations Report 96-4217
Geohydrology and water quality of stratified-drift aquifers in the Upper Connecticut and Androscoggin River basins, northern New Hampshire, 1997, Water-Resources Investigations Report 96-4318
Water, ice, and meteorological measurements at South Cascade Glacier, Washington, 1996 balance year, 1997, Water-Resources Investigations Report 97-4143
Regional water table (1996) and water-level changes in the Mojave River, the Morongo, and the Fort Irwin ground-water basins, San Bernardino County, California, 1997, Water-Resources Investigations Report 97-4160
Urbanization and recharge in the vicinity of East Meadow Brook, Nassau County, New York: Part 3 — Ground-water levels and flow conditions, 1988-93, 1997, Water-Resources Investigations Report 96-4265
Potentiometric surfaces of the Potomac-Raritan-Magothy aquifer system near National Park, New Jersey, 1996, 1997, Water-Resources Investigations Report 97-4112
Scour, sedimentation, and sediment characteristics at six levee-break sites in Missouri from the 1993 Missouri River Flood, 1997, Water-Resources Investigations Report 97-4110
Comparison of the 2-, 25-, and 100-year recurrence interval floods computed from observed data with the 1995 urban flood-frequency estimating equations for Georgia, 1997, Water-Resources Investigations Report 97-4118
Hydrogeologic evaluation of the Upper Floridan aquifer in the southwestern Albany area, Georgia, 1997, Water-Resources Investigations Report 97-4129
Digital simulation of ground-water flow in the Warwick Aquifer, Fort Totten Indian Reservation, North Dakota, 1997, Water-Resources Investigations Report 97-4114
Measurement of ground-water storage change and specific yield using the temporal-gravity method near Rillito Creek, Tucson, Arizona, 1997, Water-Resources Investigations Report 97-4125
Water resources of the Browning-Starr school area, Blackfeet Indian Reservation, northwestern Montana, 1997, Water-Resources Investigations Report 97-4134
Application of the Bridge Stream Tube Model for Alluvial River Simulations (BRI-STARS) at bridge 101-17-5096A, State Road 101; over the St. Joseph River at Saint Joe, Indiana, 1997, Water-Resources Investigations Report 97-4137
Herbicide concentrations in and loads transported by the Conestoga River and Pequea Creek, Lancaster County, Pennsylvania, 1992-95, 1997, Water-Resources Investigations Report 97-4124
Rhodhiss Lake, North Carolina: Analysis of ambient conditions and simulation of hydrodynamics, constituent transport, and water-quality characteristics, 1993-94, 1997, Water-Resources Investigations Report 97-4131
Hydrogeologic framework and geochemistry of the Edwards aquifer saline-water zone, south-central Texas, 1997, Water-Resources Investigations Report 97-4133
Ground-water resources in the vicinity of Cortland, Trumbull County, Ohio, 1997, Water-Resources Investigations Report 97-4130
Metals, pesticides, and semivolatile organic compounds in sediment in Valley Forge National Historical Park, Montgomery County, Pennsylvania, 1997, Water-Resources Investigations Report 97-4120
Loads and yields of nutrients and suspended sediment in the Susquehanna River basin, 1985-89, 1997, Water-Resources Investigations Report 96-4099
Occurrence of nitrate, pesticides, and volatile organic compounds in the Kirkwood-Cohansey aquifer system, southern New Jersey, 1997, Water-Resources Investigations Report 97-4241
Comparison of 1972 and 1996 water levels in the Goleta central ground-water subbasin, Santa Barbara County, California, 1997, Water-Resources Investigations Report 97-4109
Changes in ground-water levels and ground-water budgets, from predevelopment to 1986, in parts of the Pasco Basin, Washington, 1997, Water-Resources Investigations Report 96-4086
Effects of boatwakes on streambank erosion Kenai River, Alaska, 1997, Water-Resources Investigations Report 97-4105
Water levels in, extent of freshwater in, and water withdrawal from eight major confined aquifers, New Jersey Coastal Plain, 1993, 1997, Water-Resources Investigations Report 96-4206
Quality of shallow ground water in alluvial aquifers of the Willamette Basin, Oregon, 1993-95, 1997, Water-Resources Investigations Report 97-4082 B
Analysis of water-level data in the Yucca Mountain area, Nevada, 1985-95, 1997, Water-Resources Investigations Report 96-4256
Application of acoustical methods for estimating water flow and constituent loads in Perdido Bay, Florida, 1997, Water-Resources Investigations Report 97-4101
Distribution of fish, benthic invertebrate, and algal communities in relation to physical and chemical conditions, Yakima River basin, Washington, 1990, 1997, Water-Resources Investigations Report 96-4280
Full equations utilities (FEQUTL) model for the approximation of hydraulic characteristics of open channels and control structures during unsteady flow, 1997, Water-Resources Investigations Report 97-4037
Determination of the 100-year flood plain on Pen Branch, Steel Creek, and their selected tributaries, Savannah River Site, South Carolina, 1996, 1997, Water-Resources Investigations Report 97-4090
Preliminary conceptual models of the occurrence, fate, and transport of chlorinated solvents in karst regions of Tennessee, 1997, Water-Resources Investigations Report 97-4097
Determination of barometric efficiency and effective porosity, boreholes UE-25 c#1, UE-25 c#2, and UE-25 c#3, Yucca Mountain, Nye County, Nevada, 1997, Water-Resources Investigations Report 97-4098
Water-quality assessment of the Puget Sound basin, Washington: Environmental setting and its implications for water quality and aquatic biota, 1997, Water-Resources Investigations Report 97-4013
Statistical analysis and areal trends of background concentrations of metals in soils of Clark County, Washington, 1997, Water-Resources Investigations Report 96-4252
Water resources of Indiana County, Pennsylvania, 1997, Water-Resources Investigations Report 95-4164
A preliminary study of runoff of selected contaminants from rural Maine highways, 1997, Water-Resources Investigations Report 97-4041
Hydrologic and water-quality conditions at Newberry Volcano, Deschutes County, Oregon, 1991-95, 1997, Water-Resources Investigations Report 97-4088
Water-quality assessment of the Rio Grande Valley, Colorado, New Mexico, and Texas -- Shallow ground-water quality and land use in the Albuquerque area, central New Mexico, 1993, 1997, Water-Resources Investigations Report 97-4067
Summary of information on aquatic biota and their habitats in the Willamette Basin, Oregon, through 1995, 1997, Water-Resources Investigations Report 97-4023
Preliminary delineation of natural geochemical reactions, Snake River Plain aquifer system, Idaho National Engineering Laboratory and vicinity, Idaho, 1997, Water-Resources Investigations Report 97-4093
Hydrologic conditions and distribution of selected radiochemical and chemical constituents in water, Snake River Plain Aquifer, Idaho National Engineering Laboratory, Idaho, 1992 through 1995, 1997, Water-Resources Investigations Report 97-4086
Comparative study of ground-water quality, 1976 and 1996, and initial gain-and-loss assessment of Boulder Creek, Boulder County, Colorado, 1997, Water-Resources Investigations Report 97-4091
Identification of potential water-bearing zones by the use of borehole geophysics in the vicinity of Keystone Sanitation Superfund Site, Adams County, Pennsylvania, and Carroll County, Maryland, 1997, Water-Resources Investigations Report 97-4104
Ground-water hydrology and water quality of Irwin Basin at Fort Irwin National Training Center, California, 1997, Water-Resources Investigations Report 97-4092
Bathymetric surveys of Morse and Geist Reservoirs in central Indiana made with acoustic Doppler current profiler and global positioning system technology, 1996, 1997, Water-Resources Investigations Report 97-4099
Generalized skew coefficients for flood-frequency analysis in Minnesota, 1997, Water-Resources Investigations Report 97-4089
Sediment oxygen demand in the Tualatin River basin, Oregon, 1992-96, 1997, Water-Resources Investigations Report 97-4103
Hydrology and water chemistry of the Benton Lake basin with emphasis on the fate of dissolved solids at Benton Lake National Wildlife Refuge, west-central Montana, 1997, Water-Resources Investigations Report 97-4100
Bibliography of Regional Aquifer-System Analysis Program of the US Geological Survey, 1978-96, 1997, Water-Resources Investigations Report 97-4074
Hydrogeology, water quality, and simulation of ground-water-development alternatives in the Usquepaug-Queen ground-water reservoir, southern Rhode Island, 1997, Water-Resources Investigations Report 97-4126
Hydrogeology and ground-water quality of confined aquifers in buried valleys in Rock County, Minnesota and Minnehaha County, South Dakota, 1997, Water-Resources Investigations Report 97-4029
Water-table conditions and stream-aquifer interaction in the Hunt-Annaquatucket-Pettaquamscutt Aquifer, central Rhode Island, October 7-9, 1996, 1997, Water-Resources Investigations Report 97-4167
Characterization of stormwater runoff in Sioux Falls, South Dakota, 1995-96, 1997, Water-Resources Investigations Report 97-4070
Surface-water-quality assessment of the upper Illinois River Basin in Illinois, Indiana, and Wisconsin– Results of investigations through April 1992, 1997, Water-Resources Investigations Report 96-4223
Relation of hydrogeologic characteristics to distribution of radioactivity in ground water, Newark Basin, New Jersey, 1997, Water-Resources Investigations Report 95-4136
Simulation of water-surface elevations for a hypothetical 100-year peak flow in Birch Creek at the Idaho National Engineering and Environmental Laboratory, Idaho, 1997, Water-Resources Investigations Report 97-4083
Nitrate and pesticides in surficial aquifers and trophic state and phosphorus sources for selected lakes, eastern Otter Tail County, west-central Minnesota, 1993-96, 1997, Water-Resources Investigations Report 97-4085
Low-flow characteristics and profiles for the Deep River in the Cape Fear River basin, North Carolina, 1997, Water-Resources Investigations Report 97-4128
An optimized network for phosphorus load monitoring for Lake Okeechobee, Florida, 1997, Water-Resources Investigations Report 97-4011
Modifications to a one-dimensional model of unsteady flow in the Colorado River through the Grand Canyon, Arizona, 1997, Water-Resources Investigations Report 97-4046
Nitrogen and phosphorus loading from drained wetlands adjacent to Upper Klamath and Agency lakes, Oregon, 1997, Water-Resources Investigations Report 97-4059
Estimates of recharge from runoff at the Hanford Site, Washington, 1997, Water-Resources Investigations Report 97-4038
Water-quality assessment of the Las Vegas Valley area and the Carson and Truckee River basins, Nevada and California: Nutrients, pesticides, and suspended sediment, October 1969-April 1990, 1997, Water-Resources Investigations Report 97-4106
Hydraulic properties and ground-water flow in the St Peter-Prairie du Chien-Jordan aquifer, Rochester area, southeastern Minnesota, 1997, Water-Resources Investigations Report 97-4015
Simulation of ground-water flow in the unconfined aquifer system of the Toms River, Metedeconk River, and Kettle Creek basins, New Jersey, 1997, Water-Resources Investigations Report 97-4066
Tritium, deuterium, and oxygen-18 in water collected from unsaturated sediments near a low-level radioactive-waste burial site south of Beatty, Nevada, 1997, Water-Resources Investigations Report 97-4062
Estimates of bridge scour at two sites on the Virgin River, southeastern Nevada, using a sediment-transport model and historical geomorphic data, 1997, Water-Resources Investigations Report 97-4073
Effects of urbanization on water quality in the Kansas River, Shunganunga Creek Basin, and Soldier Creek, Topeka, Kansas, October 1993 through September 1995, 1997, Water-Resources Investigations Report 97-4045
Surface-water quality changes after 5 years of nutrient management in the Little Conestoga Creek headwaters, Pennsylvania, 1989-91, 1997, Water-Resources Investigations Report 97-4048
Evaluation of quality assurance/quality control data collected by the US Geological Survey for water-quality activities at the Idaho National Engineering Laboratory, Idaho, 1994 through 1995, 1997, Water-Resources Investigations Report 97-4058
Hydrogeology of Lake Tahoe Basin, California and Nevada, and results of a ground-water quality monitoring network, water years 1990-92, 1997, Water-Resources Investigations Report 97-4072
Hydrology of the unconfined aquifer system, Salem River Area: Salem River and Raccoon, Oldmans, Alloway, and Stow Creek Basins, New Jersey, 1993-94, 1997, Water-Resources Investigations Report 96-4195
Nitrogen and pesticide concentrations in an agricultural basin in north-central Connecticut, 1997, Water-Resources Investigations Report 97-4076
Light attenuation in a shallow, turbid reservoir, Lake Houston, Texas, 1997, Water-Resources Investigations Report 97-4064
Bibliography of selected references on the hydrogeologic and chemical properties of the Galena-Platteville bedrock unit in Illinois and Wisconsin, 1877-1997, 1997, Water-Resources Investigations Report 97-4054 A
Assessment of nutrients, suspended sediment, and pesticides in surface water of the upper Snake River basin, Idaho and western Wyoming, water years 1991-95, 1997, Water-Resources Investigations Report 97-4020
Evaluation of ground-water flow and solute transport in the Lompoc area, Santa Barbara County, California, 1997, Water-Resources Investigations Report 97-4056
Determining discharge-coefficient ratings for coastal structures in Dade County, Florida, 1997, Water-Resources Investigations Report 97-4079
Relations of Tualatin River water temperatures to natural and human-caused factors, 1997, Water-Resources Investigations Report 97-4071
Water-quality assessment of the Potomac River Basin: Analysis of available pesticide data, 1972-1990, 1997, Water-Resources Investigations Report 97-4051
Simulation of ground-water flow and application to the design of a contaminant removal system, Loring Air Force Base, Maine, 1997, Water-Resources Investigations Report 97-4055
Hydrologic and water-quality conditions in the Horse Creek basin, west-central Florida, October 1992-February 1995, 1997, Water-Resources Investigations Report 97-4077
Water-quality assessment of the Kanawha-New River basin, West Virginia, Virginia, and North Carolina: Review of water-quality literature through 1996, 1997, Water-Resources Investigations Report 97-4075
Occurrence and Distribution of Organochlorine Compounds in Biological Tissue and Bed Sediment From Streams in the Trinity River Basin, Texas, 1992-93, 1997, Water-Resources Investigations Report 97-4057
Hydrologic disturbance and response of aquatic biota in Big Darby Creek basin, Ohio, 1997, Water-Resources Investigations Report 96-4315
Hydrology and ground-water budgets of the Dayton Valley hydrographic area, west-central Nevada, 1997, Water-Resources Investigations Report 97-4123
Analysis of ground-water flowpaths near water-supply wells, Picatinny Arsenal, New Jersey, 1997, Water-Resources Investigations Report 96-4228
Reconnaissance of surface-water quality in the North Platte Natural Resources District, western Nebraska, 1993, 1997, Water-Resources Investigations Report 96-4316
Ground-water development and the effects on ground-water levels and water quality in the town of Atherton, San Mateo County, California, 1997, Water-Resources Investigations Report 97-4033
Hydrogeologic framework, analysis of ground-water flow, and relations to regional flow in the fall zone near Richmond, Virginia, 1997, Water-Resources Investigations Report 97-4021
Evaluation of radionuclide, inorganic constituent, and organic compound data from selected wells and springs from the southern boundary of the Idaho National Engineering Laboratory to the Hagerman Area, Idaho, 1989 through 1992, 1997, Water-Resources Investigations Report 97-4007
Evaluation of streamflow traveltime and streamflow gains and losses along the lower Purgatoire River, southeastern Colorado, 1984-92, 1997, Water-Resources Investigations Report 96-4291
Full Equations (FEQ) model for the solution of the full, dynamic equations of motion for one-dimensional unsteady flow in open channels and through control structures, 1997, Water-Resources Investigations Report 96-4240
Water-quality assessment of the Ozark Plateaus study unit, Arkansas, Kansas, Missouri, and Oklahoma: Organic compounds in surface water, bed sediment, and biological tissue, 1992-95, 1997, Water-Resources Investigations Report 97-4031
Occurrence of phosphorus, other nutrients, and triazine herbicides in water from the Hillsdale Lake basin, Northeast Kansas, May 1994 through May 1995, 1997, Water-Resources Investigations Report 97-4019
Hydrogeologic investigation of the Malvern TCE Superfund Site, Chester County, Pennsylvania, 1997, Water-Resources Investigations Report 96-4286
Method for rapid estimation of scour at highway bridges based on limited site data, 1997, Water-Resources Investigations Report 96-4310
The computer program FourPt (Version 95.01), a model for simulating one-dimensional, unsteady, open-channel flow, 1997, Water-Resources Investigations Report 97-4016
Geologic ages and accumulation rates of basalt-flow groups and sedimentary interbeds in selected wells at the Idaho National Engineering Laboratory, Idaho, 1997, Water-Resources Investigations Report 97-4010
Analysis of aquifer tests conducted in boreholes USW WT-10, UE-25 WT#12, and USW SD-7, 1995-96, Yucca Mountain, Nevada, 1997, Water-Resources Investigations Report 96-4293
Determination of the 100-year flood plain on Fourmile Branch at the Savannah River Site, South Carolina, 1996, 1997, Water-Resources Investigations Report 96-4271
Geohydrology and water quality of Marine Corps Logistics Base, Nebo and Yermo annexes, near Barstow, California, 1997, Water-Resources Investigations Report 96-4301
Geologic and hydraulic characteristics of selected shaly geologic units in Oklahoma, 1997, Water-Resources Investigations Report 96-4303
Evaluation of aquifer storage recovery in the Santee Limestone/Black Mingo Aquifer near Charleston, South Carolina, 1993-95, 1997, Water-Resources Investigations Report 96-4283
Effects of land use and geohydrology on the quality of shallow ground water in two agricultural areas in the western Lake Michigan drainages, Wisconsin, 1997, Water-Resources Investigations Report 96-4292
Recharge from precipitation in three small glacial-till-mantled catchments in the Puget Sound Lowland, Washington, 1997, Water-Resources Investigations Report 96-4219
Analysis of minimum 7-day discharges and estimation of minimum 7-day, 2-year discharges for streamflow-gaging stations in the Brazos River basin, Texas, 1997, Water-Resources Investigations Report 97-4117
Ground-water sampling methods and quality-control data for the Red River of the North basin, Minnesota, North Dakota, and South Dakota, 1993-95, 1997, Water-Resources Investigations Report 96-4317
Strontium distribution coefficients of surficial sediment samples from the Idaho National Engineering Laboratory, Idaho, 1997, Water-Resources Investigations Report 97-4044
Water-quality assessment of south-central Texas: Occurrence and distribution of volatile organic compounds in surface water and ground water, 1983-94, and implications for future monitoring, 1997, Water-Resources Investigations Report 97-4028
Determination of traveltimes in the lower San Joaquin River basin, California, from dye-tracer studies during 1994-1995, 1997, Water-Resources Investigations Report 97-4018
Results of the application of seismic-reflection and electromagnetic techniques for near-surface hydrogeologic and environmental investigations at Fort Bragg, North Carolina, 1997, Water-Resources Investigations Report 97-4042
Field screening of water, soil, bottom sediment, and biota associated with irrigation drainage in the Dolores Project and the Mancos River Basin, southwestern Colorado, 1994, 1997, Water-Resources Investigations Report 97-4008
Relation of nitrogen and phosphorus in ground water to land use in four subunits of the Potomac River basin, 1997, Water-Resources Investigations Report 96-4268
Shallow ground-water quality beneath cropland in the Red River of the North Basin, Minnesota and North Dakota, 1993-95, 1997, Water-Resources Investigations Report 97-4001
Water balance and quantification of total phosphorus and total nitrogen loads entering and leaving the Lago de Cidra, Central Puerto Rico, 1997, Water-Resources Investigations Report 96-4222
Geochemical analyses of ground-water ages, recharge rates, and hydraulic conductivity of the N aquifer, Black Mesa area, Arizona, 1997, Water-Resources Investigations Report 96-4190
Hydrogeology of, and quality and recharge ages of ground water in Prince William County, Virginia, 1990-91, 1997, Water-Resources Investigations Report 97-4009
Simulation of subsurface storage and recovery of effluent using multiple wells, St Petersburg, Florida, 1997, Water-Resources Investigations Report 97-4024
Concentrations, loads, and yields of potentially toxic constituents in irrigation-drain systems, Newlands Project area, Carson Desert, Nevada, November 1994-October 1995, 1997, Water-Resources Investigations Report 97-4034
Water withdrawal and use in Maryland, 1992-93, 1997, Water-Resources Investigations Report 96-4314
Review of selected features of the natural system model, and suggestions for applications in South Florida, 1997, Water-Resources Investigations Report 97-4039
Changes in cross-section geometry and channel volume in two reaches of the Kankakee River in Illinois, 1959-94, 1997, Water-Resources Investigations Report 96-4261
Transport and transformations of chlorinated-solvent contamination in a saprolite and fractured rock aquifer near a former wastewater-treatment plant, Greenville, South Carolina, 1997, Water-Resources Investigations Report 97-4003
Effects of highway deicing chemicals on shallow unconsolidated aquifers in Ohio, interim report, 1988-93, 1997, Water-Resources Investigations Report 97-4027
Use of isotopic data to evaluate recharge and geologic controls on the movement of ground water in Las Posas Valley, Ventura County, California, 1997, Water-Resources Investigations Report 97-4035
Water-quality assessment of the Rio Grande Valley, Colorado, New Mexico and Texas: Fish communities at selected sites, 1993-95, 1997, Water-Resources Investigations Report 97-4017
Water-quality assessment of the Rio Grande Valley, Colorado, New Mexico and Texas: Organic compounds and trace elements in bed sediment and fish tissue, 1992-93, 1997, Water-Resources Investigations Report 97-4002
Study of nonpoint source nutrient loading in the Patuxent River basin, Maryland, 1997, Water-Resources Investigations Report 96-4273
Geohydrology and water chemistry in the Rialto-Colton Basin, San Bernardino County, California, 1997, Water-Resources Investigations Report 97-4012
Guidelines and standard procedures for studies of ground-water quality; selection and installation of wells, and supporting documentation, 1997, Water-Resources Investigations Report 96-4233
Evaluation of selected wells in Pennsylvania's observation-well program as of 1993, 1997, Water-Resources Investigations Report 96-4319
The geothermal hydrology of southern Grass Valley, Pershing County, Nevada, 1997, Water-Resources Investigations Report 96-4139
Mass balance, meteorological, ice motion, surface altitude, and runoff data at Gulkana Glacier, Alaska, 1993 balance year, 1997, Water-Resources Investigations Report 96-4299
Evapotranspiration for three sparse-canopy sites in the Black Rock Valley, Yakima County, Washington, March 1992 to October 1995, 1997, Water-Resources Investigations Report 96-4207
Vulnerability of ground water to atrazine leaching in Kent County, Michigan, 1997, Water-Resources Investigations Report 96-4198
Ground-water resources of three areas on the Spokane and Kalispel Indian Reservations, northeastern Washington, 1997, Water-Resources Investigations Report 94-4235
Stream-temperature characteristics in Georgia, 1997, Water-Resources Investigations Report 96-4203
Nutrients, benthic algae, and stream quality during low streamflow in the Palouse River basin, Washington and Idaho, 1997, Water-Resources Investigations Report 96-4078
Estimation of nutrient and suspended-sediment loads in the Patuxent River basin, Maryland, water years 1986-90, 1997, Water-Resources Investigations Report 96-4175
Development of a data base of community water-supply wells in New Jersey and a method of evaluate their sensitivity to contamination, 1997, Water-Resources Investigations Report 96-4132
Fish communities of benchmark streams in agricultural areas of eastern Wisconsin, 1997, Water-Resources Investigations Report 96-4038 D
Precipitation-runoff and streamflow-routing models for the Willamette River basin, Oregon, 1997, Water-Resources Investigations Report 95-4284
Evaluation of agricultural best-management practices in the Conestoga River headwaters, Pennsylvania: Effects of nutrient management on quality of surface runoff and ground water at a small carbonate-rock site near Ephrata, Pennsylvania, 1984-90, 1997, Water-Resources Investigations Report 95-4143
Changes in flow in the Beaver-North Canadian River basin upstream from Canton Lake, western Oklahoma, 1997, Water-Resources Investigations Report 96-4304
A method for evaluating water-level response to hydrologic stresses in karstic wetlands in central Florida, using a simple water-balance model, 1997, Water-Resources Investigations Report 96-4216
Numerical simulation of ground-water flow paths and discharge locations at Puget Sound Naval Shipyard, Bremerton, Washington, 1997, Water-Resources Investigations Report 96-4147
Quantity and quality of runoff from selected guttered and unguttered roadways in northeastern Ramsey County, Minnesota, 1997, Water-Resources Investigations Report 96-4284
Evaluation of agricultural best-management practices in the Conestoga River headwaters, Pennsylvania: Effects of pipe-outlet terracing on quantity and quality of surface runoff and ground water in a small carbonate-rock basin near Churchtown, Pennsylvania, 1983-89, 1997, Water-Resources Investigations Report 94-4206
Recharge and discharge areas and quality of groundwater in Tooele Valley, Tooele County, Utah, 1997, Water-Resources Investigations Report 97-4005
Chlorofluorocarbon and tritium age determination of ground-water recharge in the Ryan Flat subbasin, Trans-Pecos Texas, 1997, Water-Resources Investigations Report 96-4245
Estimated ground-water discharge by evapotranspiration, Ash Meadows area, Nye County, Nevada, 1994, 1997, Water-Resources Investigations Report 97-4025
Field screening of water quality, bottom sediment, and biota associated with the Emery and Scofield project areas, Central Utah, 1994, 1997, Water-Resources Investigations Report 96-4298
Nutrients and pesticides in ground water of the Ozark Plateaus in Arkansas, Kansas, Missouri, and Oklahoma, 1997, Water-Resources Investigations Report 96-4313
Metal speciation in the Upper Arkansas River, Colorado, 1990-93, 1997, Water-Resources Investigations Report 96-4282
Geohydrology and water quality of stratified drift aquifers in the Upper Merrimack River Basin, south-central New Hampshire, 1997, Water-Resources Investigations Report 95-4123
Ground-water flow and ground- and surface-water interaction at the Weldon Spring quarry, St. Charles County, Missouri, 1997, Water-Resources Investigations Report 96-4279
Water-quality assessment of the Rio Grande Valley, Colorado, New Mexico and Texas: Ground-water quality in the Rio Grande flood plain, Cochiti Lake, New Mexico, to El Paso, Texas, 1995, 1997, Water-Resources Investigations Report 96-4249
Remediation of petroleum hydrocarbon-contaminated ground water in the vicinity of a jet-fuel tank farm, Hanahan, South Carolina, 1997, Water-Resources Investigations Report 96-4251
Ground-water resources of Catron County, New Mexico, 1997, Water-Resources Investigations Report 96-4258
The relation between hydrogeology and water quality of the Lower Floridan Aquifer in Duval County, Florida, and implications for monitoring movement of saline water, 1997, Water-Resources Investigations Report 96-4242
Geologic framework of the Edwards Aquifer and upper confining unit, and hydrogeologic characteristics of the Edwards Aquifer, south-central Uvalde County, Texas, 1997, Water-Resources Investigations Report 97-4094
Assessment of the water resources of the Grand Ronde area, Oregon, 1997, Water-Resources Investigations Report 97-4040
Hydrologic conditions and hazards in the Kennicott River Basin, Wrangell-St. Elias National Park and Preserve, Alaska, 1997, Water-Resources Investigations Report 96-4296
Ambient quality of ground water in the vicinity of Naval Submarine Base Bangor, Kitsap County, Washington, 1995, 1997, Water-Resources Investigations Report 96-4309
Geohydrology and water quality of stratified-drift aquifers in the Winnipesaukee River Basin, central New Hampshire, 1997, Water-Resources Investigations Report 94-4150
Delineation and extent of saltwater intrusion in the Biscayne aquifer, eastern Dade County, Florida, 1995, 1997, Water-Resources Investigations Report 96-4285
Regional equations for estimation of peak-streamflow frequency for natural basins in Texas, 1997, Water-Resources Investigations Report 96-4307
Hydrogeology and simulated effects of urban development on water resources of Spanish Springs Valley, Washoe County, west-central Nevada, 1997, Water-Resources Investigations Report 96-4297
Hydrogeology and potential for ground-water development, carbonate-rock aquifers, southern Nevada and southeastern California, 1997, Water-Resources Investigations Report 95-4168
Potentiometric surface and hydrologic conditions of the upper aquifer in the Manatí-Vega Baja area, north central Puerto Rico, March 1995, 1997, Water-Resources Investigations Report 96-4184
Time of travel of solutes in the Sabine River basin, Texas, August-November 1996, 1997, Water-Resources Investigations Report 97-4065
Delineation of ground-water basins and recharge areas for municipal water-supply springs in a karst aquifer system in the Elizabethtown area, northern Kentucky, 1997, Water-Resources Investigations Report 96-4254
Geohydrology and simulation of ground-water flow for the Ohio River alluvial aquifer near Owensboro, northwestern Kentucky, 1997, Water-Resources Investigations Report 96-4274
Everyone lives downstream: Water-quality issues related to urban development of the upper Chattahoochee River watershed, 1997, Water-Resources Investigations Report 96-4302
Ground-water resources of northern Big Smoky Valley, Lander and Nye counties, central Nevada, 1997, Water-Resources Investigations Report 96-4311
Saline-water contamination in Quaternary deposits and the Poplar River, East Poplar Oil Field, northeastern Montana, 1997, Water-Resources Investigations Report 97-4000
Effects of pumping municipal wells at Manhattan, Kansas, on streamflow in the Big Blue and Kansas Rivers, Northeast Kansas, 1992-94, 1997, Water-Resources Investigations Report 96-4290
Geology, hydrology, and ground-water quality at the Byron Superfund site near Byron, Illinois, 1997, Water-Resources Investigations Report 95-4240
Regional analysis of annual precipitation maxima in Montana, 1997, Water-Resources Investigations Report 97-4004
Hydrogeology and water quality of the West Valley Creek Basin, Chester County, Pennsylvania, 1997, Water-Resources Investigations Report 94-4137
Evaluation of agricultural best-management practices in the Conestoga River headwaters, Pennsylvania: Hydrology of a small carbonate site near Ephrata, Pennsylvania, prior to implementation of nutrient management, 1997, Water-Resources Investigations Report 93-4173
Geohydrology of the shallow aquifer system, Naval Weapons Station Yorktown, Yorktown, Virginia, 1997, Water-Resources Investigations Report 97-4188
Results of borehole geophysical logging and aquifer-isolation tests conducted in the John Wagner and Sons, Inc. former production well, Ivyland, Pennsylvania, 1997, Water-Resources Investigations Report 97-4095
Physical and chemical characteristics of Terrace Reservoir, Conejos County, Colorado, May 1994 through May 1995, 1997, Water-Resources Investigations Report 96-4150
Rock-stratigraphic nomenclature, lithology, and subcrop area of the Galena-Platteville bedrock unit in Illinois and Wisconsin, 1997, Water-Resources Investigations Report 97-4054 B
Hydrological and biogeochemical research in the Shingobee River headwaters area, north-central Minnesota, 1997, Water-Resources Investigations Report 96-4215
Geologic framework, hydrogeology, and ground-water quality of the Potomac Group aquifer system, northwestern Charles County, Maryland, 1997, Water-Resources Investigations Report 91-4059
Ground-water resources of alluvial valleys in northeastern Puerto Rico—Rio Espiritu Santo to Rio Demajagua area, 1997, Water-Resources Investigations Report 96-4201
Flood of October 6-7, 1985, Puerto Rico, 1997, Water-Resources Investigations Report 95-4166
Enhancements to the Branched Lagrangian Transport Modeling System, 1997, Water-Resources Investigations Report 97-4050
Retention of sediments and nutrients in Jackson Creek wetland near Delavan Lake, Wisconsin, 1993-95, 1997, Water-Resources Investigations Report 97-4014
Sediment deposition in Lake Clarke, Lake Aldred, and Conowingo Reservoir, Pennsylvania and Maryland, 1910-93, 1997, Water-Resources Investigations Report 96-4048
Thickness of the Mississippi River Valley alluvial aquifer in eastern Arkansas, 1997, Water-Resources Investigations Report 97-4049
BIOMOC, a multispecies solute-transport model with biodegradation, 1997, Water-Resources Investigations Report 97-4022
Potential effects of large floods on the transport of atrazine into the alluvial aquifer adjacent to the lower Platte River, Nebraska, 1997, Water-Resources Investigations Report 96-4272
Stratigraphy, sedimentology, and volume of sediments behind a dam relic on the Muskegon River, Big Rapids, Michigan, 1997, Water-Resources Investigations Report 97-4069
The one-dimensional compression method for extraction of pore water from unsaturated tuff and effects on pore-water chemistry, 1997, Water-Resources Investigations Report 96-4281