Skip to main content
U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Results

185258 results.

Alternate formats: RIS file of the first 3000 search results  |  Download all results as CSV | TSV | Excel  |  RSS feed based on this search  |  JSON version of this page of results

Page 3720, results 92976 - 93000

Show results on a map

Publication Extents

Not all publications have extents, not all extents are completely accurate
Simulated three-dimensional ground-water flow in the Lockport Group, a fractured-dolomite aquifer near Niagara Falls, New York
Richard M. Yager
1996, Water Supply Paper 2487
A three-dimensional model was developed through a parameter-estimation method based on nonlinear regression to simulate ground-water flow in the Lockport Group, a fractured dolomite aquifer near Niagara Falls, N.Y. Horizontal fracture zones within the Lockport Group were represented by model layers, and connections between the zones were represented by vertical...
Ground-water resources of the lower Apalachicola-Chattahoochee-Flint River basin in parts of Alabama, Florida, and Georgia — Subarea 4 of the Apalachicola-Chattahoochee-Flint and Alabama-Coosa-Tallapoosa River basins
Lynn J. Torak, Robin John McDowell
1996, Open-File Report 95-321
The study area is underlain by Coastal Plain sediments of pre-Cretaceous to Quaternary age consisting of alternating units of sand, clay, sandstone, dolomite, and limestone that gradually thicken and dip gently to the southeast. The Upper Floridan aquifer is composed of an off lapping sequence of clastic and carbonate sediments...
Aquatic biology of the San Joaquin-Tulare basins, California; analysis of available data through 1992
Larry R. Brown
1996, Water Supply Paper 2471
Available data through 1992 on aquatic biota in the San Joaquin-Tulare Basins study unit of the National Water-Quality Assessment Program were analyzed to provide a conceptual framework to guide study design. The analysis included information on the biology of fish, aquatic macroinvertebrates, aquatic algae, and concentrations of trace elements and...
Data base for a national mineral-resource assessment of undiscovered deposits of gold, silver, copper, lead, and zinc in the conterminous United States
S. D. Ludington, D. P. Cox, R.B. McCammon
1996, Open-File Report 96-96
For this assessment, the conterminous United States was divided into 12 regions Adirondack Mountains, Central and Southern Rocky Mountains, Colorado Plateau, East Central, Great Basin, Great Plains, Lake Superior, Northern Appalachians, Northern Rocky Mountains, Pacific Coast, Southern Appalachians, and Southern Basin and Range. The assessment, which was conducted by regional...
Summary of floods in the United States during 1990 and 1991
Paul Robert Jordan, L. J. Combs
1996, Water Supply Paper 2474
This volume contains 50 articles describing severe, widespread, or unusual flooding in 28 of the 50 States during 1990 and 1991. Each flood is described to an extent commensurate with its significance and the availability of data on the hydrology and the damages. Each article includes one or more maps...
Procedures for adjusting regional regression models of urban-runoff quality using local data
Anne B. Hoos, Joy S. Lizarraga
1996, Water Supply Paper 2428
Statistical operations termed model-adjustment procedures can be used to incorporate local data into existing regression modes to improve the predication of urban-runoff quality. Each procedure is a form of regression analysis in which the local data base is used as a calibration data set; the resulting adjusted regression models can...
Descriptions of anisotropy and heterogeneity and their effect on ground-water flow and areas of contribution to public supply wells in a karst carbonate aquifer system
Lari A. Knochenmus, James L. Robinson
1996, Water Supply Paper 2475
MODFLOW and MODPATH numerical models were used to generate areas of contribution to public supply wells for simulated hypothetical anisotropy and heterogeneous carbonate aquifer systems. The simulations incorporated, to varying degrees, the anisotropy and heterogeneity observed in a karst carbonate aquifer system. These include: isotropic and homogeneous single-layer system, doubly-porous...
Effects of land use on water quality of the Fountain Creek alluvial aquifer, east-central Colorado
Daniel T. Chafin
1996, Water Supply Paper 2381-D
Water-quality data were collected from the Fountain Creek alluvial aquifer in 1988 and 1989 as part of the Toxic-Waste Ground-Water Contamination Program. These data indicate that dissolved solids, most major ions, fluoride, ammonium, boron, lithium, selenium, and strontium were more concentrated in the agricultural land-use area than in the upgradient...