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Page 4066, results 101626 - 101650

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Reconnaissance investigation of water quality, bottom sediment, and biota associated with irrigation drainage in the San Juan River area, San Juan County, northwestern New Mexico, 1990-91
P. J. Blanchard, Richard R. Roy, T.F. O’Brien
1993, Water-Resources Investigations Report 93-4065
Selenium concentrations larger than established standards and criteria were present in Gallegos Canyon and Ojo Amarillo Canyon drainages on the Navajo Indian Irrigation Project, a pond on the West Hammond Irrigation Project, and a drain on the Hogback Irrigation Project, New Mexico. Ground-water return flow from irrigated areas contributes substantially...
Estimating net drawdown resulting from episodic withdrawals at six well fields in the coastal plain physiographic province of Virginia
M. J. Focazio, G. K. Speiran
1993, Water-Resources Investigations Report 93-4159
The groundwater-flow system of the Virginia Coastal Plain consists of areally extensive and interconnected aquifers. Large, regionally coalescing cones of depression that are caused by large withdrawals of water are found in these aquifers. Local groundwater systems are affected by regional pumping, because of the interactions within the system of...
Methods for collecting algal samples as part of the National Water-Quality Assessment Program
Stephen D. Porter, Thomas F. Cuffney, Martin E. Gurtz, Michael R. Meador
1993, Open-File Report 93-409
Benthic algae (periphyton) and phytoplankton communities are characterized in the U.S. Geological Survey's National Water-Quality Assessment Program as part of an integrated physical, chemical, and biological assessment of the Nation's water quality. This multidisciplinary approach provides multiple lines of evidence for evaluating water-quality status and trends, and for refining an...
Water Resources Data, Florida, Water Year 1992. Volume 2B. South Florida Ground Water
W.J. Haire, A.C. Lietz
1993, Water Data Report FL-92-2B
This volume of the annual hydrologic data report of Florida is one of a series of annual reports that document hydrologic data gathered from the U.S. Geological Survey's surface- and ground-water data-collection networks in each State, Puerto Rico, and the Trust Territories. These records of streamflow, ground-water levels, and quality...
A response to "Milankovitch theory viewed from Devils Hole" by J. Imbrie, A.C. Mix and D.G. Martinson
I.J. Winograd, J.M. Landwehr
1993, Open-File Report 93-357
The detailed and well-dated 500,000-yr record of oxygen-18 variations found in vein calcite core DH-11 taken from Devils Hole in Nevada provides several challenges to the Milankovitch theory for the occurrence of Quaternary glaciations. A recent discussion paper (Imbrie and others, 1993) has dismissed the relevance of this well-dated core...
Surface-water-quality assessment of the Yakima River basin in Washington: Analysis of major and minor elements in fine-grained streambed sediment, 1987
G. J. Fuhrer, S. W. McKenzie, J. F. Rinella, R. F. Sanzolone, K. A. Skach
1993, Open-File Report 93-30
Fine-grained streambed sediment from the Yakima River Basin was sampled from 448 locations and analyzed for 45 elements. Anomalous major- and minor-element concentrations were based on baseline values established from element concentrations in streambed sediment in the basin. The largest number of anomalies occurred for antimony, arsenic, cerium, copper,...
Water-quality assessment of the Delmarva Peninsula, Delaware, Maryland, and Virginia--Effects of agricultural activities on, and distribution of, nitrate and other inorganic constituents in the surficial aquifer
P. A. Hamilton, J. M. Denver, P. J. Phillips, R. J. Shedlock
1993, Open-File Report 93-40
Agricultural applications of inorganic fertilizers and manure have changed the natural chemical com- position of water in the surficial aquifer through- out the Delmarva Peninsula. Nitrate, derived from nitrification of ammonia in inorganic fertilizers and manure, is the dominant anion in agricultural areas. Concentrations of nitrate in 185 water samples...
Quality assurance plan for the collection and processing of sediment data by the U.S. Geological Survey, Water Resources Division
J. M. Knott, G.D. Glysson, B.A. Malo, L.J. Schroeder
1993, Open-File Report 92-499
The U.S. Geological Survey sediment data quality assurance plan identifies and explains required quality assurance and suggested quality control practices. The approach is to subdivide the process for obtaining sediment data into 3 parts: (1) field, (2) office, and (3) laboratory operations. The report also summarizes recommended goals for each...
Water resources data, Nevada, water year 1992
D.L. Hess, K.A. Mello, R.J. Sexton, R.L. Young
1993, Water Data Report NV-92-1
This report for Nevada is one of a series of annual reports that document hydrologic data gathered from the U.S. Geological Survey's surface-water and ground-water data-collection networks in each State, Puerto Rico, and the Trust Territories. These records of streams, canals, drains and springs, lakes and reservoirs, and observation wells...