Digital model of ground-water flow in the Piceance Basin, Rio Blanco and Garfield Counties, Colorado
John B. Weeks
1978, Water-Resources Investigations Report 78-46
The digital model used to simulate ground-water flow in the aquifer system in the basin drained by Piceance and Yellow Creeks in northwestern Colorado is described in detail. The model is quasi three-dimensional in that it simulates ground-water flow in a multiaquifer system by assuming horizontal flow in the aquifers...
Methods of estimating recharge to the Floridan aquifer in northeast Florida
G. G. Phelps
1978, Water-Resources Investigations Report 77-109
Recharge to the principal artesian aquifer in a six-county area in northeast Florida was calculated using closed contour methods , water budgets, and formulas for computing leakage through confining beds. Each estimate was tested in a computer model of groundwater flow to see which estimate was best. Calculations of flow...
A conceptual ecological model for Chesapeake Bay
Katherine A. Green
1978, FWS/OBS 78/69
Geology of the uranium prospect at Camp Smith, New York, with a new model for the formation of uranium deposits in metamorphosed submarine volcanogenic rocks
Richard I. Grauch
1978, Open-File Report 78-949
Uraninite of Precambrian age occurs locally in and around a massive sulfide deposit at Camp Smith, Westchester and Putnam Counties, New York. The host rocks are believed to be part of a sequence of marine sediments and submarine volcanogenic rocks that were metamorphosed to leucogneisses, amphibolites, and amphoholite gneisses in...
The Coffee Sand and Ripley aquifers in Mississippi
E. H. Boswell
1978, Water-Resources Investigations Report 78-114
The Coffee Sand and Ripley aquifers, of Cretaceous age, are in the Selma Group in northern Mississippi. The aquifers contain freshwater in an area of about 4,400 square miles in northern Mississippi. Water produced from the aquifers by public water systems and numerous industries in 1975 averaged about 4 Mgal/d....
Computer model of two-dimensional solute transport and dispersion in ground water
Leonard F. Konikow, J.D. Bredehoeft
1978, Techniques of Water-Resources Investigations 07-C2
This report presents a model that simulates solute transport in flowing ground water. The model is both general and flexible in that it can be applied to a wide range of problem types. It is applicable to one- or two-dimensional problems involving steady-state or transient flow. The model computes changes...
Ages of flow units in the far eastern lunar maria based on crater density
Joseph M. Boyce
1978, Open-File Report 78-879
The distribution of major geologic units of uniform relative age exposed in the far eastern maria (i.e., Mare Marginis, Mare Smythii, and Mare Crisium) and Mare Humorum was compiled in map form on the basis of a crater density mapping technique. Correlation of crater densities and radiometric ages of Apollo...
Application of digital profile modeling techniques to ground-water solute transport at Barstow, California
Stanley G. Robson
1978, Water Supply Paper 2050
This study investigated the use of a two-dimensional profile-oriented water-quality model for the simulation of head and water-quality changes through the saturated thickness of an aquifer. The profile model is able to simulate confined or unconfined aquifers with nonhomogeneous anisotropic hydraulic conductivity, nonhomogeneous specific storage and porosity, and nonuniform saturated...
Regional and local networks of horizontal control, Cerro Prieto geothermal area, Mexico
Bruce L. Massey
1978, Open-File Report 78-929
The Cerro Prieto geothermal area in the Mexicali Valley 30 km southeast of Mexicali, Baja California, is probably deforming due to (1) the extraction of large volumes of steam and hot water, and (2) active tectonism. Two networks of precise horizontal control were established in Mexicali Valley by the U.S....
A guide to mathematical models used in steam electric power plant environmental impact assessment
Sanford G. Bloom, Barney W. Cornaby, William E. Martin
1978, FWS/OBS 78/01
Use and interpretation of strong-motion records from highway bridges
J.D. Raggett, Christopher Rojahn
1978, Open-File Report 78-707
This report describes how strong-motion records obtained from the earthquake-induced motions of highway bridges may be analyzed for use in the evaluation of bridge designs and bridge design procedures.This report is divided into five principal sections. The first section describes strong-motion instrumentation and strong-motion records. In the second section, a...
An empirical transport model for evaluating entrainment of aquatic organisms by power plants
John Boreman, C. Phillip Goodyear, Sigurd W. Christensen
1978, FWS/OBS 78/90
Chemical, physical, biochemical, and bacteriological characteristics at selected stream sites in Puerto Rico, 1976-77
Ferdinand Quinones-Marquez, Pedro Vasquez, Rafael Pena Cortes
1978, Open-File Report 78-445
In 1969, the Caribbean District of the U.S. Geological Survey, in cooperation with the Commonwealth of Puerto Rico, initiated the operation of a network to monitor some parameters indicative of water-quality changes at selected stream sites. The initial network consisted of 18 stations, which were expanded to 20 in 1971,...
Channel migration of the White River in the eastern Uinta Basin, Utah and Colorado
Antonio Jurado, Fred K. Fields
1978, IMAP 1087
The White River is the largest stream in the southeastern part of the Uinta Basin in Utah and Colorado. This map shows the changes that have occurred in the location of the main channel of the river from 1936 to 1974. The map indicated that certain reaches of the river...
Calibration of a mathematical model of the Antelope Valley ground-water basin, California
Timothy J. Durbin
1978, Water Supply Paper 2046
Technique for estimating magnitude and frequency of floods in Delaware
R.H. Simmons, D.H. Carpenter
1978, Water-Resources Investigations Report 78-93
A flood-estimating method is presented which applies to drainage basins in Delaware without urban development and covers selected recurrence intervals from 2 to 100 years. The method was developed by multiple-regression techniques. The State is divided into two regions and sets of equations for calculating peak discharges based on physical...
Numerical modeling of liquid geothermal systems
M.L. Sorey
1978, Professional Paper 1044-D
No abstract available....
A theoretical basis for exploration for native copper in northern Wisconsin
Walter S. White
1978, Circular 769
Exploration for native copper in the Keweenawan lavas of northern Wisconsin has been concentrated in areas of relatively shallow overburden that have sparse to numerous outcrops. Lack of success of this exploration suggests that if large deposits, comparable to those of northern Michigan, are present, they are more likely to...
Unsteady solute-transport simulation in streamflow using a finite-difference model
Larry F. Land
1978, Water-Resources Investigations Report 78-18
This report documents a rather simple, general purpose, one-dimensional, one-parameter, mass-transport model for field use. The model assumes a well-mixed conservative solute that may be coming from an unsteady source and is moving in unsteady streamflow. The quantity of solute being transported is in the units of concentration. Results are...
FRISK: computer program for seismic risk analysis using faults as earthquake sources
Robin K. McGuire
1978, Open-File Report 78-1007
This computer program makes probabilistic seismic hazard calculations at sites affected by earthquakes occurring on faults which are defined by the user as a series of line segments. The length of rupture of the fault as a function of earthquake magnitude is accounted for, and ground motion estimates at the...
Analysis of runoff from small drainage basins in Wyoming
Gordon S. Craig, James G. Rankl
1978, Water Supply Paper 2056
A flood-hydrograph study has defined the magnitude and frequency of flood volumes and flood peaks that can be expected from drainage basins smaller than 11 square miles in the plains and valley areas of Wyoming. Rainfall and runoff data, collected for 9 years on a seasonal basis (April through September),...
Water chemistry of the Redwood Creek and Mill Creek basins, Redwood National Park, Humboldt and Del Norte Counties, California
Wesley L. Bradford, Rick T. Iwatsubo
1978, Water-Resources Investigations Report 78-115
A 2-year study was made in the Redwood Creek and Mill Creek drainage basins of Redwood National Park to determine existing chemical water-quality conditions and to identify the effects of logging on water quality in the main stems and tributaries of the two basins. Overall, the chemical water quality of...
Model evaluation of the hydrogeology of the Cypress Creek well field in west-central Florida
Paul D. Ryder
1978, Water-Resources Investigations Report 78-79
The Cypress Creek well field is being developed to help supply a rapidly growing population in west-central Florida. The ground-water system in the Cypress Creek well-field area consists of a surficial sand aquifer, a semiconfining clay layer ranging from 2 to 25 feet in thickness, and a sequence of carbonate...
Computer modeling of ground-water availability in the Pootatuck River Valley, Newtown, Connecticut
F.P. Haeni, Elinor H. Handman
1978, Water-Resources Investigations Report 78-77
A hydrologic analysis of the stratified drift in Newtown, Conn., based on available data, test drilling, seismic refraction profiling, and the stream-aquifer connection was performed using a digital computer model. Simulated pumping indicates that a total of 4.0 million gallons of water per day (Mgal/d) can be withdrawn from the...
Hot, deep origin of petroleum: shelf and shallow basin evidence and application
Leigh C. Price
1978, Open-File Report 78-1021
Oil and gas pools in shallow basins or on the shallow, stable shelves of deeper sedimentary basins may not be exceptions to the model of a hot deep origin of petroleum. The oil in shallow basins is directly associated with faulting extending out of the deepest parts of the basin....
