Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 9967
Chemical analyses of water from observation wells in the Edwards and associated limestones, San Antonio area, Texas, 1965
No abstract available.
Authors
Sergio Garza
Ground-water recharge to the Edwards and associated limestones, San Antonio area, Texas, 1964
No abstract available.
Authors
Sergio Garza
Uptake of 2,4-dichlorophenoxyacetic acid by Pseudomonas fluorescens
Factors influencing the uptake of the sodium salt of 2,4-dichlorophenoxyacetic acid (2,4-D), under conditions in which no net metabolism occurred, were investigated in an effort to determine both the significance of “non-metabolic” uptake as a potential agent in reducing pesticide levels and the mechanisms involved. Uptake of 2,4-D was affected by pH, temperature, and the presence of other organic
Authors
Gary Wedemeyer
Toxicities of several pesticides to two species of Cladocerans
Laboratory bioassays were conducted with some chlorinated hydrocarbon insecticides, organophosphate insecticides, other insecticides and acaricides, and with herbicides to determine their relative toxicities and immobilization values for two species of daphnids, Daphnia pulex and Simocephalus serrulatus. Both species are satisfactory bioassay organisms for the determination of a wide variety of pe
Authors
Herman O. Sanders, Oliver B. Cope
Some effects of Heptachlor on bluegills (Lepomis macrochirus)
In complementary studies of the chronic effects of heptachlor on bluegills, four similar earthen ponds were treated once with different concentrations of heptachlor, and the fish in six plastic pools were routinely fed different levels of heptachlor. A fifth pond and two plastic pools were used as controls. Higher dosages resulted in higher concentrations of heptachlor residues, more pronounced ti
Authors
Austin K. Andrews, Bruce E. Stebbings, Charles C. Van Valin
Persistence of 2,6-Dichlorobenzonitrile in aquatic environments
In two experiments 2,6-dichlorobenzonitrile was added to aquatic systems, and the residue levels were followed for about 6 months. A granular formulation applied to a farm pond at 0.6 p.p.m. produced highest residues in water and fish about 2 weeks following treatment whereas vegetation and soil samples had the highest levels within 1 or 2 days. Residues were still measurable after 188 days. In po
Authors
C.C. Van Valin
Water-surface profiles of Raccoon River at Des Moines, Iowa
This investigation was undertaken as a part of the cooperative program with the Iowa Institute of Hydraulic Research, the City of Des Moines, and the U.S. Geological Survey. The purpose of this report is twofold:
1. To present water-surface profiles and rating curves for existing channel conditions in the 4-mile reach of Raccoon River upstream from the mouth, and
2. To show the effect upon water
Authors
Philip J. Carpenter, David H. Appel
Effect of the partial control of natural salinity on water quality in Possum Kingdom Reservoir, Texas
No abstract available.
Authors
L.S. Hughes
Some effects of urbanization on storm runoff, Waller Creek, Austin, Texas, 1955-62
No abstract available.
Authors
W.H. Espey
Fluctuations of ground-water levels in Puerto Rico resulting from earthquakes (1959-1961)
During the Chilean earthquake of May 22, 1960, intensity 8.5, 4 of 8 wells in Puerto Rico equipped with automatic recorders, recorded seismic fluctuations. The maximum double amplitude, 0.05 ft, was recorded at a well in bedrock near Coamo. Double amplitudes in 3 other wells ranged from slightly less than .01 to .02 ft. Following the Puerto Rico earthquake of Aug. 2, 1961, intensity about 5.5, sei
Authors
Irving G. Grossman