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Digital Model of the Bates Creek Alluvial Aquifer Near Casper, Wyoming
From abstract: "A digital model was used to simulate ground-water flow within the Bates Creek alluvial aquifer, southwest of Casper, Wyoming. Hydrologic data was collected during 1977 and 1978 were used to develop the flow model under steady-state and transient. Three scenarios for operating the stream-aquifer system were evaluated with the digital model." It contains maps, graphs, and tables.
Date:
1983
Creator:
Glover, Kent C.
System:
The UNT Digital Library
A Digital Model of the Floridian Aquifer, North of Tampa, Florida
From purpose and scope: The purpose of this report is to describe the development and calibration of a regional digital model of the Floridian aquifer in the Tampa Bay area. This model can be used to provide regional analyses of the effects of present and proposed pumping from the Floridian aquifer.
Date:
October 1977
Creator:
Robertson, Alton F. & Mallory, Michael J.
System:
The UNT Digital Library
Digital Model Simulation of the Glacial-Outwash Aquifer at Dayton, Ohio
From introduction: The specific purpose of the digital model study was to develop a better understanding of the aquifer system and to show how it responds to various pumping stresses. The scope of the study was to develop a single-transmissive-layer model that could be used to evaluate the effects proposed ground-water development schemes would have on water levels.
Date:
September 1975
Creator:
Fidler, Richard E.
System:
The UNT Digital Library
Digital-Model Simulation of the Glacial-Outwash Aquifer, Otter Creek-Dry Creek Basin, Courtland County, New York
This report uses a digital model to predict the projected increase in ground-water use caused by a population influx for September 1976 in Cortland, New York. It contains maps, tables, and other figures.
Date:
1978
Creator:
Cosner, Oliver J. & Harsh, John F.
System:
The UNT Digital Library
Digital Model to Predict Effects of Pumping from the Arikaree Aquifer in the Dwyer Area, Southeastern Wyoming
Abstract: ^ digital computer model was used to model an unconfined sandstone aquifer (Arikaree aquifer) in about 340 square miles (880 square kilometers) in southeastern Wyoming. The model was calibrated by comparing observed and calculated changes in the potentiometric surface and leakage from the aquifer along streams during water year 1974. The comparison was fairly good for changes in the potentiometric surface and was good for leakage. The calibrated model was used to predict changes in the potentiometric surface and leakage through water year 1979, assuming no new ground-water development after 1974 and normal recharge to the aquifer. Water-level declines of as much as 14 feet (4.3 meters) were predicted, but much of the area would be relatively unaffected. The total predicted decrease in leakage between water years 1974 and 1979 was about 500 acre-feet (0.6 cubic hectometer) per year; the greatest decrease was predicted along streams closest to areas of pumpage.
Date:
February 1976
Creator:
Lines, Gregory C.
System:
The UNT Digital Library
Digital Models of a Glacial Outwash Aquifer in the Pearl-Sallie Lakes Area, West-Central Minnesota
From purpose and scope: The purpose of this investigation is to 1) study the hydrologic system in a glaciated terrain typified by numerous lakes, with particular focus on the effects of lake-ground-water interchange, 2) simulate the natural system by using two digital modeling methods--areal (map view) and vertical section, and 3) evaluate the utility of the models and determine the kinds and amount of basic data needed to obtain reasonable simulations.
Date:
November 1975
Creator:
Larson, Steven P.; McBride, Mark S. & Wolf, Ronald J.
System:
The UNT Digital Library
Digital-Simulation and Projection of Head Changes in the Potomac-Raritan-Magothy Aquifer System, Coastal Plain, New Jersey
From abstract: A digital model was used to simulate the response of the Potomac-Raritan-Magothy aquifer system to pumping stresses during the 18-year period, 1956-73. The model was used to compute projected potentiometric heads and trends to the year 2000. Three sets of conditions were simulated: (1) no increase in ground-water extractions, (2) continued growth in ground-water extractions at the rate of 3 percent annually, and (3) continued growth in ground-water extractions at the rate of 3 percent annually, in conjunction with the activation of a freshwater head barrier in the fresh-salty water transition zone.
Date:
June 1980
Creator:
Luzier, James E.
System:
The UNT Digital Library
Digital-Transport Model Study of the Potential Effects of Coal-Resource Development on the Ground-Water System in the Yampa River Basin, Moffat and Routt Counties, Colorado
From abstract: Large increases in coal mining currently (1979) taking place in the Yampa River basin are expected to continue during the 1980's and may adversely impact both the ground-water and surface-water quality in the basin. One potential source of adverse impact is the dissolution of soluble minerals contained in the overburden material disturbed during the mining. This potential impact was investigated using digital ground-water transport-modeling techniques.
Date:
1982
Creator:
Warner, James W. & Dale, Robert H.
System:
The UNT Digital Library
Distribution and Movement of Zinc and Other Heavy Metals in South San Francisco Bay, California
From introduction: The primary objective of this study was to determine the net transport of zinc into the study area from urbanized perimeter, out of the study area across the northern boundary of the study area, and across the sediment-water interface within the study area, all within a limited time period. A secondary objective was to assemble as much data on other trace metals--their concentrations and chemical states in water, suspended solids, sediments and interstitial fluids--as possible within the time and funding constraints of the study in order to describe the existing trace metal conditions in the south bay. Thus the bulk of effort was directed toward evaluating the distribution and movements of zinc, but the data collected on the distribution and movements of zinc, but the data collected on the distribution of other metals is important and is reported here.
Date:
February 1976
Creator:
Bradford, Wesley L.
System:
The UNT Digital Library
Distribution and Trend of Nitrate, Chloride, and Total Solids in Water in the Magothy Aquifer in Southeast Nassau County, New York, from the 1950's Through 1973
Abstract: Concentrations of nitrate, chloride, and total sol ids in water in the Magothy aquifer, southeast Nassau County, N.Y., show a steadily increasing trend from the early 1950's to 1973. Vertical distribution of nitrate, chloride, and total-solids concentrations as shown in sections of the study area indicate downward movement of these constituents. Maximum concentrations are in a zone underlying the areas of Westbury, Hicksvil.le, and Plainview. Nitrate (as nitrogen) concentration increased from 4-5 milligrams per liter to 7 milligrams per liter in the area of Westbury and from 3 to 10 milligrams per liter in Plainview during the period 1950-73. During this same period, a 10 milligram-per-liter line of equal-chloride concentration on a cross section in the Westbury area moved downward a distance of less than 50 feet (15 meters), and in the area of Hicksville nearly 150 feet (45 meters). Total-solids concentration doubled in the area of Plainview, where maximum downward movement of pollutants was observed.
Date:
August 1976
Creator:
Ku, Henry F. H. & Sulam, Dennis J.
System:
The UNT Digital Library
Distribution of Chloride Concentrations in the Principal Aquifers of the New Jersey Coastal Plain, 1977-81
From abstract: The U.S. Geological Survey maintains a saltwater monitoring network in New Jersey to document and evaluate the movement of saline water into freshwater aquifers that serve as sources of water supply. This report delineates areas in the Coastal Plain where existing or potential saltwater intrusion exists.
Date:
1983
Creator:
Schaefer, F. L.
System:
The UNT Digital Library
Distribution of Nitrate in Ground Water Redlands, California
Report and geographical survey. This report examines the distribution of nitrates in the Redland area's ground water and concludes that this distribution depends primarily upon depth below the water table and areal location. Includes several maps and figures.
Date:
March 1977
Creator:
Eccles, Lawrence A. & Bradford, Wesley L.
System:
The UNT Digital Library
Distribution of Nitrate in the Unsaturated Zone, Highland-East Highlands Area, San Bernardino County, California
From abstract: "This study was made to describe the distribution of inorganic nitrogen and other chemical constituents and nitrogen-using bacteria in the unsaturated zone, to relate nitrogen occurrences, in a general way, to present and historical land use, and to attempt to predict nitrogen concentrations in ground water after recharge" within the Highland-East Highlands area of San Bernardino County, California. It includes maps, graphs, and tables.
Date:
September 1980
Creator:
Klein, J. M. & Bradford, W. L.
System:
The UNT Digital Library
Distribution of Selected Chemical Constituents in Water from the Floridian Aquifer, Southwest Florida Water Management District
From introduction: The study is part of a continuing cooperative program with the Southwest Florida Water Management District to define and describe characteristics of the aquifer. Aquifer characteristics determined from the study will provide data necessary for regulatory agencies to more efficiently manage water supply and development. The study area includes 10 counties and parts of 6 other counties within the District.
Date:
1983
Creator:
Corral, Miguel A., Jr.
System:
The UNT Digital Library
Downstream Effects of Reservoir Releases to the Potomac River from Luke, Maryland, to Washington D.C.
From purpose and scope: This report describes a method of estimating downstream responses of reservoir releases from the Bloomington and Savage Reservoirs in the upper Potomac River basin.
Date:
1982
Creator:
Trombley, Thomas J.
System:
The UNT Digital Library
Drainage Basins in Duval County, Florida
"Duval County in northeastern Florida and adjacent to the Atlantic Ocean contains approximately 840 square miles of which approximately 80 square miles are covered by water. The county is drained by three major rivers, the St. Johns, Nassau, and St. Marys. In addition, the coastal areas are drained by numerous small streams that empty into the Intracoastal Waterway or the Atlantic Ocean."
Date:
1983
Creator:
Stone, Roy B. & Largen, Joseph B.
System:
The UNT Digital Library
Drinking-Water Quality and Variations in Water Levels in the Fractured Crystalline-Rock Aquifer, West-Central, Jefferson County, Colorado
From abstract: From parts of the area, water for domestic use obtained from the fractured crystalline-rock aquifer contained excessive concentration of dissolved fluoride, dissolved nitrite plus nitrate, dissolved solids, dissolved iron, dissolved manganese, dissolved zinc, coliform bacteria, gross alpha radiation, and gross beta radiation. Based on water-quality analyses from 26 wells located in small urbanized areas, water from 21 of the wells contained excessive concentrations of one of more constituents.
Date:
September 1979
Creator:
Hall, Dennis C. & Johnson, Carl J.
System:
The UNT Digital Library
Effect of Surface Coal Mining on the Hydrology of Crooked and Turkey Creek Basins, Jefferson County, Alabama
From introduction: The objective of this project is to measure the impact coal mining has on the hydrologic system and to develop the capability for predicting the effect of future mining on water resources. To achieve this necessities isolating the problems and measuring the parameters involved before, during, and after mining.
Date:
August 1979
Creator:
Puente, Celso
System:
The UNT Digital Library
The Effect of the Faka Union Canal System on Water Levels in the Fakahatchee Strand, Collier County, Florida
From purpose and scope: The purpose of the investigation was to make a preliminary evaluation of the effects of the Faka Union Canal system on water levels in the Fakahatchee Strand. The evaluation includes more of a data collected specifically for the report as well as other data.
Date:
September 1977
Creator:
Swayze, L. J. & McPherson, B. F.
System:
The UNT Digital Library
Effect of the Proposed Cooper River Rediversion on Sedimentation in Charleston Harbor, South Carolina
From abstract: The purpose of this investigation was to use existing information to determine the probable effectiveness of the proposed rediversion in reducing rates of sedimentation and maintenance dredging in the (Charleston) harbor.
Date:
1983
Creator:
Patterson, Glenn G.
System:
The UNT Digital Library
Effect of Urbanization on the Water Resources of Warminster Township, Bucks County, Pennsylvania
Purpose: This investigation by the U.S. Geological Survey, in cooperation with the Warminster Municipal Authority, has three purposes: (1) to determine how urbanization has affected ground water and low streamflow in Warminster Township and parts of the surrounding municipalities; (2) to describe the hydrologic system; and (3) to assess the availability of ground water.
Date:
January 1983
Creator:
Sloto, Ronald A. & Davis, Drew K.
System:
The UNT Digital Library
Effect on Sediment Yield and Water Quality of a Nonrehabilitated Surface Coal Mine in North-Central Wyoming
From introduction: The purpose of this study was to determine the magnitude of some effects of an abandoned surface coal mine on the hydrologic environment. Specific objectives were (1) to define areas of erosion and deposition; (2) to determine if the sediment yield from an undisturbed drainage basin was less than that from a drainage basin partly disturbed by mining activity; and (3) to determine if there were differences in chemical composition of hillslope materials, sediment, and pond water in the two basins.
Date:
March 1979
Creator:
Ringen, Bruce H.; Shown, Lynn M.; Hadley, Richard F. & Hinkley, Todd K.
System:
The UNT Digital Library
Effects of a Cattle Feedlot on Ground-Water Quality in the South Platte River Valley Near Greeley, Colorado
This report presents changes in water quality in an alluvial aquifer near Greeley, Colorado. It contains maps, graphs, and tables.
Date:
1981
Creator:
Borman, R. G.
System:
The UNT Digital Library
Effects of a Floodwater-Retarding Structure on the Hydrology and Ecology of Trout Creek in Southwestern Wisconsin
Abstract: The primary effect of a floodwater-retarding structure (FRS) on the flow of Trout Creek, Wisconsin, is attenuation of flood peaks. Reduction of flood peaks ranged from 58 to 91 percent during the study period, 1975 to 1979. An inverse relationship exists between sediment concentration and outflow from the FRS during floods. Most sediment stored in the flood pool during floods is released from the reservoir during subsequent reduced discharge. Sediment-trapping efficiency of the FRS was 7 percent during the 4-year study. The bankfull capacity of the channel was reduced from 154 cubic feet per second upstream from the FRS to 65 cubic feet per second downstream. Mean bankfull depth downstream from the FRS has adjusted to a value 45 percent less than upstream from the structure due to the sedimentation of materials transported from the FRS during reduced flows. The FRS was not found to have any significant adverse effect on the arthropod fauna or trout reproduction in Trout Creek from 1975 to 1979. During 1960-1979, winter floods seem to have had the greatest adverse effect on the survival of brown trout eggs and sac fry.
Date:
August 1982
Creator:
Wentz, Dennis A. & Graczyk, David J.
System:
The UNT Digital Library