Publications
These publications are written or co-authored by Central Midwest Water Science Center personnel in conjuction with their work at the USGS and other government agencies. They include USGS reports, journal articles, conference proceedings, and published abstracts that are available in the USGS Publications Warehouse.
Filter Total Items: 979
A reconnaissance study of herbicides and their metabolites in surface water of the midwestern united states using immunoassay and gas chromatography/mass spectrometry A reconnaissance study of herbicides and their metabolites in surface water of the midwestern united states using immunoassay and gas chromatography/mass spectrometry
Preemergent herbicides and their metabolites, particularly atrazine, deethylatrazine, and metolachlor, persisted from 1989 to 1990 in the majority of rivers and streams in the midwestern United States. In spring, after the application of herbicides, the concentrations of atrazine, alachlor, and simazine were frequently 3-10 times greater than the U.S. Environmental Protection Agency...
Authors
E. Michael Thurman, D. A. Goolsby, M. T. Meyer, M. S. Mills, M.L. Pomes, Dana W. Kolpin
Hydrologic data for the Big Spring basin, Clayton County, Iowa, water year 1990 Hydrologic data for the Big Spring basin, Clayton County, Iowa, water year 1990
Hydrologic data were collected in the Big Spring basin located in Clayton County, Iowa, during the 1990 water year. The data were collected by the U.S. Geological Survey in cooperation with the Iowa Department of Natural Resources, Geological Survey Bureau, to provide information on variation and movement of agricultural chemicals in the hydrologic cycle in the basin. Precipitation...
Authors
Stephen J. Kalkhoff, R.L. Kuzniar, D. Kolpin, C.A. Harvey
Time of travel and dispersion in a selected reach of Roberts Creek, Clayton County, Iowa Time of travel and dispersion in a selected reach of Roberts Creek, Clayton County, Iowa
Time of travel and dispersion were determined in a 9.4-river-mile reach of Roberts Creek in northwestern Clayton County, Iowa, in the spring of 1990. Time of travel was determined so that a discrete parcel of water could be sampled through the study area during medium to low streamflow conditions. Dispersion characteristics were determined to identify solute-transport differences under...
Authors
D.W. Kolpin, S. J. Kalkhoff
Evaluation of selected methods for determining streamflow during periods of ice effect Evaluation of selected methods for determining streamflow during periods of ice effect
Seventeen methods for estimating ice-affected streamflow are evaluated for potential use with the U.S. Geological Survey streamflow-gaging station network. The methods evaluated were identified by written responses from U.S. Geological Survey field offices and by a comprehensive literature search. The methods selected and techniques used for applying the methods are described in this...
Authors
Norwood B. Melcher, J.F. Walker
Quality-assurance plan for the analysis of fluvial sediment by laboratories of the U.S. Geological Survey Quality-assurance plan for the analysis of fluvial sediment by laboratories of the U.S. Geological Survey
This report describes procedures used by the Iowa District sediment laboratory of the U.S. Geological Survey to assure the quality of sediment-laboratory data. These procedures can be used by other U.S. Geological Survey laboratories regardless of size and type of operation for quality assurance and quality control of specific sediment-laboratory processes. Also described are the...
Authors
Wilbur J. Matthes, Clyde J. Sholar, John R. George
Herbicide transport in rivers: Importance of hydrology and geochemistry in nonpoint-source contamination Herbicide transport in rivers: Importance of hydrology and geochemistry in nonpoint-source contamination
Alachlor, atrazine, cyanazine, metolachlor, and metribuzin were measured at six sites during 1984 and 1985 in large subbasins within the Cedar River, IA. A computer model separated the Cedar River discharge hydrograph into groundwater and overland-flow components. The concentration of herbicides in the river when groundwater was the major flow component was less than 1.0 μg/L and...
Authors
P. J. Squillace, E.M. Thurman
Water resources data, Iowa, water year 1992 Water resources data, Iowa, water year 1992
No abstract available.
Authors
J.G. Gorman, C.J. Anderson, R.B. Lambert, D. Sneck-Fahrer, W. Wang
Management systems evaluation area; Iowa, Walnut Creek watershed Management systems evaluation area; Iowa, Walnut Creek watershed
No abstract available.
Authors
P. J. Soenksen, J.L. Hatfield, J. L. Baker
Water resources data, Iowa, water year 1991 Water resources data, Iowa, water year 1991
Water resources data for the 1991 water year for Iowa consist of records of stage discharge,and water quality of streams; stage, contents, and water quality of lakes and reservoirs; ground water levels and water quality of ground-water wells. This report contains records of water discharge for 118 stream-gaging stations; stage or contents for 9 lakes and reservoirs; water quality for 6...
Authors
D. J. O’Connell, R.B. Lambert, W.J. Matthes, D. Sneck-Fahrer
A summary of water-resources activities of the U.S. Geological Survey in Iowa, fiscal year 1992 A summary of water-resources activities of the U.S. Geological Survey in Iowa, fiscal year 1992
Water-resources activities of the U.S. Geological Survey in Iowa consist of collecting hydrologic data and conducting interpretive studies. Hydrologic investigations in Iowa are made through three basic types of projects: (1) hydrologic data-collection programs; (2) local or areal studies; and (3) statewide or regional investigations. These projects are funded through cooperative joint...
Floods of 1986 and 1990 in the Raccoon River basin, west-central Iowa Floods of 1986 and 1990 in the Raccoon River basin, west-central Iowa
No abstract available.
Authors
R.W. Baebenroth, B.D. Schaap