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Page 3712, results 92776 - 92800

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Drought-trigger ground-water levels and analysis of historical water-level trends in Chester County, Pennsylvania
Curtis L. Schreffler
1996, Water-Resources Investigations Report 97-4113
The Chester County observation-well network was established in 1973 through a cooperative agreement between the Chester County Water Resources Authority (CCWRA) and the U.S. Geological Survey. The network was established to monitor local ground-water levels, to determine drought conditions, and to monitor ground-water-level trends. Drought-warning and drought-emergency water-level triggers were...
Level II scour analysis for Bridge 25 (BRNATH00290034) on Town Highway 29, crossing Locust Creek, Barnard, Vermont
Michael A. Ivanoff, Matthew A. Weber
1996, Open-File Report 96-642
This report provides the results of a detailed Level II analysis of scour potential at structure BRNATH00290034 on Town Highway 29 crossing Locust Creek, Barnard, Vermont (figures 1-8). A Level II study is a basic engineering analysis of the site, including a quantitative analysis of stream stability and scour (U.S....
Preliminary bedrock geologic map of the Vermont part of the 7.5 x 15 minute Mount Ascutney and Springfield quadrangles, Windsor County, Vermont
G. J. Walsh, T. R. Armstrong, N. M. Ratcliffe
1996, Open-File Report 96-719
Bedrock in the Vermont part of the Mount Ascutney and Springfield quadrangles consists largely of, from west to east, Middle Proterozoic gneisses in the core of the Chester Dome, pre-Silurian metasedimentary, metavolcanic, and meta-igneous rocks as a cover sequence immediately above the dome, Silurian and Devonian metasedimentary and metavolcanic rocks...
Potentiometric Surface of the Lower Patapsco Aquifer in Southern Maryland, September 1995
Stephen E. Curtin, David C. Andreasen, Frederick K. Mack
1996, Open-File Report 96-623
A map showing the potentiometric surface of the lower Patapsco aquifer in the Patapsco Formation of Cretaceous age in southern Maryland during September 1995 was prepared from water-level measurements in 69 wells. The potentiometric surface was 87 feet above sea level near the northwestern boundary and outcrop area of the...
The difference between the potentiometric surfaces of the Aquia aquifer of September 1982 and September 1995 in southern Maryland
Stephen E. Curtin, David C. Andreasen, Frederick K. Mack
1996, Open-File Report 96-624
A map showing the net change in the potentiometric surface of the Aquia aquifer in the Aquia Formation of Paleocene age in southern Maryland was based on water levels measured in 66 wells from September 1982 to September 1995 and shows that the decline of the potentiometric surface during the...
Offshore gas hydrate sample database with an overview and preliminary analysis
James S. Booth, Mary M. Rowe, Kathleen M. Fisher
1996, Open-File Report 96-272
Synopsis -- A database of offshore gas hydrate samples was constructed from published observations and measurements. More than 90 samples from 15 distinct regions are represented in 13 data categories. This database has permitted preliminary description of gas hydrate (chiefly methane hydrate) tendencies and associations with respect to their geological...
Potentiometric Surface of the Magothy Aquifer in Southern Maryland, September 1995
Stephen E. Curtin, David C. Andreasen, Frederick K. Mack
1996, Open-File Report 96-621
A map showing the potentiometric surface of the Magothy aquifer in the Magothy Formation of Cretaceous age in southern Maryland during September 1995 was prepared from water-level measurements in 92 wells. The potentiometric surface was highest near the northwestern boundaryand outcrop area of the aquifer in...
Potentiometric Surface of the Upper Patapsco Aquifer in Southern Maryland, September 1995
Stephen E. Curtin, David C. Andreasen, Frederick K. Mack
1996, Open-File Report 96-622
A map showing the potentiometric surface of the upper Patapsco aquifer in the Patapsco Formation of Cretaceous age in southern Maryland during September 1995 was prepared from water-level measurements in 42 wells. The potentiometric surface was nearly 120 feet above sea level near the northwestern boundary and outcrop area of...
The difference between the potentiometric surfaces of the Magothy Aquifer of September 1975 and September 1995 in southern Maryland
Stephen E. Curtin, David C. Andreasen, Frederick K. Mack
1996, Open-File Report 96-625
A map showing the net change in the poentiometric surface of the Magothy aquifer in the Magothy Formation of Cretaceous age in southern Maryland from September 1975 to September 1995 was based on water-level measurements in 67 wells. The map shows that the decline of the potentiometric surface during...
Analysis of Nonpoint-Source Ground-Water Contamination in Relation to Land Use: Assessment of Nonpoint-Source Contamination in Central Florida
Edward R. German
1996, Water Supply Paper 2381-F
In central Florida, activities that might affect the quality of ground water include disposal of stormwater through drainage wells, citrus cultivation, and mining and processing of phosphate ore. Possible effects of these and other land-use activities include high concentrations of nitrogen compounds and the pesticide bromacil in the citrus area,...