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Surface-water quality changes after 5 years of nutrient management in the Little Conestoga Creek headwaters, Pennsylvania, 1989-91
Edward H. Koerkle, Linda C. Gustafson-Minnich, Michael D. Bilger
1997, Water-Resources Investigations Report 97-4048
A 5.82-square-mile drainage basin in the headwaters of the Little Conestoga Creek in Lancaster County, Pa., was investigated from October 1989 through September 1991 as part of a longer-term effort to determine the effects of nutrient management on surface-water quality. A previous investigation found no statistical evidence that implementation of...
Preliminary geologic map of the San Fernando 7.5' quadrangle, southern California: A digital database
R.F. Yerkes
1997, Open-File Report 97-163
The city of San Fernando sits atop a structurally complex, sedimentologically diverse, and tectonically evolving late Tertiary-Quaternary basin situated within the Transverse Ranges of southern California. The surrounding San Fernando Valley (SFV) contains the headwaters of the Los Angeles River and its tributaries. Prior to the advent of flood control,...
Water-supply potential of major streams and the Upper Floridan Aquifer in the vicinity of Savannah, Georgia
Reggina Garza, Richard E. Krause
1997, Water Supply Paper 2411
Surface- and ground-water resources in the Savannah, Georgia, area were evaluated for potential water-supply development. Stream-discharge and water-quality data were analyzed for two major streams considered to be viable water-supply sources. A ground-water flow model was developed to be used in conjunction with other previously calibrated models to simulate the...
Study plan for urban stream indicator sites of the National Water-Quality Assessment Program
T. J. Lopes, C. V. Price
1997, Open-File Report 97-25
Urban Indicator Sites are one component of the U.S. Geological Survey?s National Water- Quality Assessment (NAWQA) Program. The objectives of monitoring at the Urban Indicator Sites are to: (1) characterize stream quality from drainage basins with predominantly residential and commercial land use, and (2) determine which selected natural and human...
Potentiometric Surface of the Aquia Aquifer in southern Maryland, September 1995
Stephen E. Curtin, David C. Andreasen, Frederick K. Mack
1997, Open-File Report 96-620
A map showing the potentiometric surface of the Aquia aquifer in the Aquia Formation of Paleocene age in southern Maryland during September 1995 was prepared from water-level measurements in 80 wells. The potentiometric surface was above sea level near the northwestern boundary and outcrop area of the aquifer in...
Comparison of two methods for estimating discharge and nutrient loads from Tidally affected reaches of the Myakka and Peace Rivers, West-Central Florida
V.A. Levesque, K.M. Hammett
1997, Open-File Report 97-118
The Myakka and Peace River Basins constitute more than 60 percent of the total inflow area and contribute more than half the total tributary inflow to the Charlotte Harbor estuarine system. Water discharge and nutrient enrichment have been identified as significant concerns in the estuary, and consequently, it is important...
Sequestration of hydrophobic organic contaminants by geosorbents
Richard G. Luthy, George R. Aiken, Mark L. Brusseau, Scott D. Cunningham, Philip M. Gschwend, Joseph J. Pignatello, Martin Reinhard, Samuel J. Traina, Walter J. Weber Jr., John C. Westall
1997, Environmental Science & Technology (31) 3341-3347
The chemical interactions of hydrophobic organic contaminants (HOCs) with soils and sediments (geosorbents) may result in strong binding and slow subsequent release rates that significantly affect remediation rates and endpoints. The underlying physical and chemical phenomena potentially responsible for this apparent sequestration of HOCs by geosorbents are not well understood....
An evaluation of the rust fungus Gymnoconia nitensas a potential biological control agent for alien Rubus species in Hawaii
D.E. Gardner, C.S. Hodges Jr., E. Killgore, R. C. Anderson
1997, Biological Control (10) 151-158
The rust fungus Gymnoconia nitens infects blackberry (Rubus argutus) systemically in regions of the continental United States, producing bright yellow–orange masses of spores on newly developing floricanes during springtime. In tests to determine the suitability of this rust as a biological control agent for R. penetransin Hawaii, a species now thought to be...
Dust deposition downwind of Owens (dry) Lake, 1991–1994: Preliminary findings
Marith C. Reheis
1997, Journal of Geophysical Research D: Atmospheres (102) 25999-26008
Salt‐rich dust derived from the Owens Lake playa is deposited in significant quantities to distances of at least 40 km north and south of the playa. Semiannual measurements from 1991 to 1994 of dust deposition rates (dust flux) and composition 2 m above the ground at seven...
Video evaluation of passage efficiency of American shad and sea lamprey in a modified ice harbor fishway
A. Haro, B. Kynard
1997, North American Journal of Fisheries Management (17) 981-987
Movement and behavior of adult American shad Alosa sapidissima and sea lamprey Petromyzon marinus were monitored by closed-circuit video at several locations within a modified Ice Harbor fishway. American shad ascended and descended the fishway exclusively by surface weirs, while sea lampreys used both surface weirs and submerged orifices. Upstream movement of American shad...