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Page 1735, results 43351 - 43375

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Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of the total phosphorus by a Kjeldahl digestion method and an automated colorimetric finish that includes dialysis
Charles J. Patton, Earl P. Truitt
1992, Open-File Report 92-146
A method to determine total phosphorus (TP) in the same digests prepared for total Kjeldahl nitrogen (TKN) determinations is desribed. The batch, high-temperature (block digester), HG(II)-catalyzed digestion step is similar to U.S. Geological Survey methods I-2552-85/I-4552-85 and U.S. Environmental Protection Agency method 365.4 except that sample and reagent volumes...
Selected water-quality and biological characteristics of streams in some forested basins of North Carolina, 1985-88
W.S. Caldwell
1992, Water-Resources Investigations Report 92-4129
Selected physical, chemical and biological components of streams draining undeveloped, forested basins in North Carolina were characterized on the basis of samples collected at nine sites on streams in basins that ranged in size from 0.67 to 11.2 sq mi. Water analysis included specific conductance, dissolved oxygen, water temperature, suspended...
Description and effects of 1988 drought on ground-water levels, streamflow, and reservoir levels in Indiana
K. K. Fowler
1992, Water-Resources Investigations Report 91-4100
Documentation of the 1988 drought in Indiana was undertaken to aid water-management agencies and planners concerned with periods of below-normal precipitation and their effect on commercial, agricultural, and residential water use. Precipitation, temperature, Palmer Drought Severity Indices, and ground- and surface-water levels from water years 1988 and 1989 were compared...
Assessment of hydrogeologic conditions with emphasis on water quality and wastewater injection, southwest Sarasota and West Charlotte counties, Florida
C. B. Hutchinson
1992, Water Supply Paper 2371
The 250-square-mile area of southwest Sarasota and west Charlotte Counties is underlain by a complex hydrogeologic system having diverse ground-water quality. The surficial and intermediate aquifer systems and the Upper Floridan aquifer of the Floridan aquifer system contain six separate aquifers, or permeable zones, and have a total thickness of...
Bathymetry at the head of the Cape Fear Slide, offshore North Carolina
Eric A. Schmuck, Peter Popenoe, Charles K. Paull, Carol Brown
1992, Miscellaneous Field Studies Map 2209
The Cape Fear Slide is the largest mass-movement that has been observed on the U.S. Atlantic Margin. It is located off the Carolinas on the continental rise in approximately 1,200-5,500 m water depth and extends downslope for over 300 km (Popenoe, 1982). These maps show the bathymetry at the head...
Climatic variability and flood frequency of the Santa Cruz River, Pima County, Arizona
Robert H. Webb, Julio L. Betancourt
1992, Water Supply Paper 2379
Past estimates of the 100-year flood for the Santa Cruz River at Tucson, Arizona, range from 572 to 2,780 cubic meters per second. An apparent increase in flood magnitude during the past two decades raises concern that the annual flood series is nonstationary in time. The apparent increase is accompanied...
Movement of water in seasonally frozen soil, southeastern North Dakota, 1985-87
D. G. Emerson
1992, Water-Resources Investigations Report 92-4110
A study of seasonally frozen soil was conducted from October 1985 through April 1986 and from October 1986 through April 1987. Three runoff plots were established. On October 30, 1985, 86 mm (millimeters) of water was applied to plot 1, and 43 mm of water was applied to plot 3....
Simulation of ground-water flow in the Antlers aquifer in southeastern Oklahoma and northeastern Texas
R. B. Morton
1992, Water-Resources Investigations Report 88-4208
The Antlers Sandstone of Early Cretaceous age occurs in all or parts of Atoka, Bryan, Carter, Choctaw, Johnston, Love, Marshall, McCurtain, and Pushmataha Counties, a 4,400-square-mile area in southeastern Oklahoma parallel to the Red River. The sandstone comprising the Antlers aquifer is exposed in the northern one-third of the area,...