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Documentation of computer program (FHB1) for assignment of transient specified-flow and specified-head boundaries in applications of the modular finite-diference ground-water flow model (MODFLOW)
Stanley A. Leake, Michael R. Lilly
1997, Open-File Report 97-571
A computer program called the Flow and Head Boundary Package (FHB1) was developed for the U.S. Geological Survey three-dimensional finite-difference modular ground-water flow model, commonly referred to as MODFLOW. FHB1 allows MODFLOW users to specify flow or head boundary conditions that vary at times other than starting and ending times...
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
Robert F. Breault, Sandra L. Harris
1997, Water-Resources Investigations Report 97-4169
Streambed-sediment samples were collected in 1992-94 at selected sites in the Connecticut, Housatonic, and Thames River Basins to determine the geographical distribution of trace elements and organic compounds and their potential for adverse biological effects on aquatic organisms. Chromium, copper, lead, mercury, nickel, zinc, chlordane, DDT, PAHs, and PCBs were...
Ground-water and surface-water elevations in the Fairbanks International Airport area, Alaska, 1990-96, and selected geohydrologic report references
David V. Claar, Michael R. Lilly
1997, Open-File Report 97-597
Ground-water and surface-water elevation data were collected at 61 sites from 1990 to 1996 by the U.S. Geological Survey in cooperation with the Alaska Department of Transportation and Public Facilities, Fairbanks International Airport. Water-surface elevations were measured in 41 ground-water observation wells and at 20 surface-water sites to help characterize...
Concentrations of selected trace elements and other constituents in the Rio Grande and in fish tissue in the vicinity of Albuquerque, New Mexico
Ralph Wilcox
1997, Open-File Report 97-667
The State of New Mexico and the Pueblo of Isleta have established surface-water standards for trace elements to control discharges of these contaminants. Before these standards can be meaningfully applied, however, ambient concentrations and loads of trace elements, principally arsenic, need to be determined in the Rio Grande and inflow...
Recharge areas and quality of ground water for the Glen Canyon and valley-fill aquifers, Spanish Valley area, Grand and San Juan counties, Utah
Judy I. Steiger, David D. Susong
1997, Water-Resources Investigations Report 97-4206
The Spanish Valley area in southeastern Utah (fig. 1) is experiencing a rapid increase in development of residential and business property. In this report, the Spanish Valley area refers to the geographic area shown in figures 1, 3, and 4. This area includes Moab Valley, Spanish Valley, and the mesa...
Spatial variability of volatile organic compounds in streams on Long Island, New York, and in New Jersey
Anne K. O’Brien, Robert G. Reiser, Helle Gylling
1997, Fact Sheet 194-97
Volatile organic compounds (VOCs) are found in almost all natural and synthetic materials and are commonly used in fuels, fuel additives, solvents, perfumes, flavor additives, and deodorants. Potential health hazards and environmental degradation resulting from the widespread use of VOCs has prompted increasing concern among scientists, industry, and the general...
Nitrate in ground water and stream base flow in the lower Susquehanna River Basin, Pennsylvania and Maryland
Bruce D. Lindsey, Connie A. Loper, Robert A. Hainly
1997, Water-Resources Investigations Report 97-4146
High concentrations of nitrate in both ground and surface water have been identified as a significant water-quality issue in the Lower Susquehanna River Basin. This report uses data collected by the National Water Quality Assessment (NAWQA) Program in the basin and compares nitrate concentrations found in ground water and surface...
Volcano and earthquake hazards in the Crater Lake region, Oregon
Charles R. Bacon, Larry G. Mastin, Kevin M. Scott, Manuel Nathenson
1997, Open-File Report 97-487
Crater Lake lies in a basin, or caldera, formed by collapse of the Cascade volcano known as Mount Mazama during a violent, climactic eruption about 7,700 years ago. This event dramatically changed the character of the volcano so that many potential types of future events have no precedent there. This...