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Effects of recharge on the transport of agricultural chemicals at the Princeton, Minn. Management Systems Evaluation Area (MSEA), 1991-92
G. N. Delin, M.K. Landon
1993, Open-File Report 93-79
Rates of water movement through the unsaturated zone greatly affect the amount and concentrations of agricultural chemicals that may reach the water table. For example, recharge can flush to the water table chemicals that have accumulated In the unsaturated zone during dry periods. A better understanding of how topography influences...
Effects of focused recharge on the transport of agricultural chemicals at the Princeton, Minnesota Management Systems Evaluation Area, 1991-92
G. N. Delin, M.K. Landon
1993, Open-File Report 93-42
Rates of water movement through the unsaturated zone greatly affect the amount and concentrations of agricultural chemicals that may reach the water table. For example, recharge can flush chemicals to the water table which have accumulated in the unsaturated zone during dry periods. A better understanding of how topography influences...
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of low-level silver by graphite furnace atomic absorption spectrophotometry
D.L. Damrau
1993, Open-File Report 93-416
Increased awareness of the quality of water in the United States has led to the development of a method for determining low levels (0.2-5.0 microg/L) of silver in water samples. Use of graphite furnace atomic absorption spectrophotometry provides a sensitive, precise, and accurate method for determining low-level silver in samples...
Methods for collecting benthic invertebrate samples as part of the National Water-Quality Assessment Program
Thomas F. Cuffney, Martin E. Gurtz, Michael R. Meador
1993, Open-File Report 93-406
Benthic invertebrate communities are evaluated as part of the ecological survey component of the U.S. Geological Survey's National Water-Quality Assessment Program. These biological data are collected along with physical and chemical data to assess water-quality conditions and to develop an understanding of the factors that affect water-quality conditions locally, regionally,...
Ground-water concerns for the Eastern Shore, Virginia
D.L. Richardson
1993, Open-File Report 93-93
The Eastern Shore of Virginia is a peninsula that is surrounded on three sides by salty water and has no major fresh surface-water sources; groundwater provides the sole freshwater supply. Beginning in about 1965, increases in groundwater withdrawals for agricultural, commercial, urban, and industrial uses have caused water-level declines and...