Precambrian ophiolites of Arabia; a summary of geologic settings, U-Pb geochronology, lead isotope characteristics, and implications for microplate accretion, Kingdom of Saudi Arabia
John S. Pallister, J. S. Stacey, L. B. Fischer, W. R. Premo
1988, Open-File Report 88-606
Disrupted ophiolites occur in linear belts as much as 900 km long between micro plates that collided during the late Proterozoic to form the Arabian Shield. The U-Pb zircon ages and lead-isotope data from these ophiolitic rocks help constrain the history of accretion of the Arabian Shield and thereby contribute...
Hydrogeology and predevelopment flow in the Texas Gulf Coast aquifer systems
Paul D. Ryder
1988, Water-Resources Investigations Report 87-4248
A multilayered ground-water flow system exists in the Coastal Plain sediments of Texas. The Tertiary and Quaternary clastic deposits have an area! extent of 128,000 square miles onshore and in the Gulf of Mexico. Two distinct aquifer systems are recognized for the sediments, which range in thickness from a few...
Geohydrology of the Furnace Creek basin and vicinity, Berks, Lancaster, and Lebanon counties, Pennsylvania
L.D. Cecil
1988, Water-Resources Investigations Report 87-4218
The Furnace Creek basin is an area of 8.95 square miles, about three- fourths of which is underlain by metamorphic rocks of low permeability. Reported yields for 14 wells in these rocks range from 1 to 60 gal/min (gallons per minute), with a median of 7.5 gal/min....
Geohydrology and numerical model analysis of ground-water flow in the Goose Lake Basin, Oregon and California
D. S. Morgan
1988, Water-Resources Investigations Report 87-4058
Geohydrology, water quality, and preliminary simulations of ground-water flow of the alluvial aquifer in the upper Black Squirrel Creek basin, El Paso County, Colorado
David R. Buckles, Kenneth R. Watts
1988, Water-Resources Investigations Report 88-4017
The upper Black Squirrel Creek basin in eastern El Paso County, Colorado, is underlain by an alluvial aquifer and four bedrock aquifers. The climate of the area is semiarid, and streamflow is irregular. The alluvial aquifer has supplied water to wells since the late 1800's when ranchers first pumped water...
Water resources of Borrego Valley and vicinity, San Diego County, California: Phase 2 - Development of a ground-water flow model
H. T. Mitten, G. C. Lines, Charles Berenbrock, T. J. Durbin
1988, Water-Resources Investigations Report 87-4199
Because of the imbalance between recharge and pumpage, groundwater levels declined as much as 100 ft in some areas of Borrego Valley, California during drinking 1945-80. As an aid to analyzing the effects of pumping on the groundwater system, a three-dimensional finite-element groundwater flow model was developed. The model was...
Hydrogeology and water-supply potential of the water-table aquifer on Dauphin Island, Alabama
R. E. Kidd
1988, Water-Resources Investigations Report 87-4283
The water table aquifer on Dauphin Island, Alabama, consists of a thin veneer of Holocene sand and an underlying Pleistocene unit locally known as the Gulfport Formation. The aquifer is from 28 to 35 ft thick with a thick marine clay at its base. Water in the aquifer generally is...
Review of mechanisms, methods, and theory for determining recharge to shallow aquifers in North Dakota
W.F. Horak
1988, Water-Resources Investigations Report 88-4122
Effective management of ground-water resources requires knowledge of all components of the water budget for the aquifer of interest. Efforts to simulate ground-water flow prior to development and the effects of proposed pumping in several of North Dakota's shallow glacial aquifers have been hindered by the lack of reliable estimates...
The Geology and Remarkable Thermal Activity of Norris Geyser Basin, Yellowstone National Park, Wyoming
Donald Edward White, Roderick A. Hutchinson, Terry E.C. Keith
1988, Professional Paper 1456
Norris Geyser Basin, normally shortened to Norris Basin, is adjacent to the north rim of the Yellowstone caldera at the common intersection of the caldera rim and the Norris-Mammoth Corridor, a zone of faults, volcanic vents, and thermal activity that strikes north from the caldera rim to Mammoth Hot Springs....
Simulated changes in ground-water flow caused by hypothetical pumping in east Carson Valley, Douglas County, Nevada
D. K. Maurer
1988, Open-File Report 87-765
An existing groundwater model of Carson Valley was used to simulate changes in groundwater flow on the east side of Carson Valley, Nevada, in response to hypothetical increases in groundwater pumpage. Pumpage scenarios that reflect State groundwater permits and pending applications were used in four different simulations to estimate the...
Effects of urbanization on storm-runoff volume and peak discharge of Valley Creek, eastern Chester County, Pennsylvania
R. A. Sloto
1988, Water-Resources Investigations Report 87-4196
Peak discharge and runoff volume were simulated for 21 storms in the Valley Creek basin using the U.S. Geological Survey Distributed Routing Rainfall-Runoff Model (DR3M). Storm peak discharges ranged from 301 to 900 cubic feet per second. Rainfall was measured at three recording rain gages in the basin. Observed and...
Effects of flood controls proposed for West Branch Brandywine Creek, Chester County, Pennsylvania
R. A. Sloto
1988, Water-Resources Investigations Report 86-4054
Twenty-four-hour rainfall, distributed over time according to the U.S. Soil Conservation Service type II rainfall distribution, was used as input to calibrated rainfall-runoff models of three subbasins in the West Branch Brandywine Creek watershed. The effects of four proposed flood controls were evaluated by using these rainfalls to simulate discharge...
Geometry of the Benioff zone and mode of subduction beneath southwestern Alaska and the Aleutian Islands
A. F. Espinosa, K.S. Rukstales
1988, IMAP 1945
Nitrogen transport in a shallow outwash aquifer at Olean, Cattaraugus County, New York
R. M. Yager, M. P. Bergeron
1988, Water-Resources Investigations Report 87-4043
Groundwater beneath an industrial park at Olean, New York, contained nitrogen compounds in concentrations that in 1983 ranged from 10 to 1,280 mg/L as nitrogen, mainly in the form of ammonium. Continuous pumping from an industrial well field creates a cone of depression that prevents the nitrogen compounds from migrating...
DLG2ISM, a Fortran program to read DLG-3 optional format digital data files into the VAX/VMS version of the interactive surface modeling software package
G.N. Green
1988, Open-File Report 88-258-A
Simulation of ground-water flow in aquifers along the Susquehanna River in Columbia County, Pennsylvania
J.H. Williams, G.E. Senko
1988, Water-Resources Investigations Report 85-4185
A numerical model of groundwater flow was developed for a 10.3 sq mi area along the Susquehanna River in Columbia County, east central Pennsylvania. Groundwater in the model area primarily is in secondary openings in the carbonate--and clastic-rock aquifers and primary openings in the glacial-outwash aquifer that discontinuously overlies bedrock....
Ground-water flow and solute transport at a municipal landfill site on Long Island, New York. Part 3, simulation of solute transport
E. J. Wexler
1988, Water-Resources Investigations Report 86-4207
A solute transport model representing a 2.3-sq mi area surrounding and downgradient from a municipal landfill site in the Town of Brookhaven, N.Y. was used to simulate migration of a conservative solute (chloride) in the upper glacial aquifer. Aquifer values used in the model were: hydraulic conductivity, 200 ft/day; effective...
Ground-water flow and solute transport at a municipal landfill site on Long Island, New York — Part 2: Simulation of ground-water flow
E. J. Wexler, P. E. Maus
1988, Water-Resources Investigations Report 86-4106
Data on the hydrogeology of a 26-sq-mi area surrounding the Brookhaven landfill site in central Suffolk County were collected as part of a hydrologic investigation of solute transport from the site. These data were used to develop a steady-state groundwater flow model of the upper glacial (water table) aquifer in...
Phytoplankton dynamics of the fresh, tidal Potomac River, Maryland, for the summers of 1979 to 1981
Ronald R.H. Cohen
1988, Water Supply Paper 2234-C
The distribution and abundance of phytoplankton in the fresh, tidal Potomac River, Md., was different during 1979-81 from that observed in the 1960's and 1970's. Concentrations of phytoplankton in the 1960's and 1970's reached maximum attainable levels that were limited only by self-shading. A sag in phytoplankton abundance, apparent during...
Simulation of five ground-water withdrawal projections for the Black Mesa area, Navajo and Hopi Indian Reservations, Arizona
J. G. Brown, J.H. Eychaner
1988, Water-Resources Investigations Report 88-4000
The N Aquifer is the main source of water in the 5,400 sq mi Black Mesa area in the Navajo and Hopi Indian Reservations in northeastern Arizona. Water in the aquifer is under confined conditions in the central 3,300 sq mi of the area. Maximum saturated thickness is about 1,050...
Preliminary evaluation of ground-water flow in Bear Creek Valley, the Oak Ridge Reservation, Tennessee
Z. C. Bailey
1988, Water-Resources Investigations Report 88-4010
Bear Creek Valley, Tennessee contains hazardous waste disposal sites where contaminants leach into ground and surface water. Groundwater flow and the potential migration of contaminants is poorly understood. The Valley is underlain by calcareous shale that contains limestone units. Ridges to the north and south are underlain by interbedded sandstones,...
Evaluation of the ground-water resources of the lower Susquehanna River basin, Pennsylvania and Maryland
James M. Gerhart, George J. Lazorchick
1988, Water Supply Paper 2284
Ground water in the 3,458-square-mile lower Susquehanna River basin occupies secondary openings in bedrock. The distribution of openings is a function of lithology, depth, and topography. Local flow systems account for most of the total ground-water flow. Average annual recharge for the lower basin is 1,857 million gallons per day,...
Simulation of flow in the Edwards Aquifer, San Antonio region, Texas, and refinement of storage and flow concepts
Robert W. Maclay, Larry F. Land
1988, Water Supply Paper 2336-A
The Edwards aquifer is a complexly faulted, carbonate aquifer lying within the Balcones fault zone of south-central Texas. The aquifer consists of thin- to massive-bedded limestone and dolomite, most of which is in the form of mudstones and wackestones. Well-developed secondary porosity has formed in association with former erosional surfaces...
Volatilization of benzene and eight alkyl-substituted benzene compounds from water
R. E. Rathbun, D. Y. Tai
1988, Water Supply Paper 2342
Predicting the fate of organic compounds in streams and rivers often requires knowledge of the volatilization characteristics of the compounds. The reference-substance concept, involving laboratory-determined ratios of the liquid-film coefficients for volatilization of the organic compounds to the liquid-film coefficient for oxygen absorption, is used to predict liquid-film coefficients for...
Simulation of the regional geohydrology of the Tesuque aquifer system near Santa Fe, New Mexico
D. P. McAda, Maryann Wasiolek
1988, Water-Resources Investigations Report 87-4056
Declining groundwater levels resulting from groundwater withdrawals in the Santa Fe, New Mexico, area have caused concern about the future availability of water in the Tesuque aquifer system. This report describes the geohydrology of the Tesuque aquifer system in the Santa Fe area and presents a three-dimensional regional groundwater flow...
