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: 932
Water resources data, Iowa, water year 1993
No abstract available.
Authors
R. E. Southard, D. Sneck-Fahrer, C.J. Anderson, R.D. Goodrich, J.G. Gorman
National Water-Quality Assessment Program; eastern Iowa basins
No abstract available.
Authors
Stephen J. Kalkhoff
Contraction scour at a bridge over the Iowa River
Flooding of the Iowa River during July and August 1993 caused extensive contraction scour at the State Highway 99 bridge over the Iowa River at Wapello, Iowa. At least 3.3 m of piling under the footing of the second pier from the right (west) abutment were exposed. The scoured streambed did not fill in again after the flood receded, and a bathymetric survey in November 1993 showed that the streamb
Authors
Edward E. Fischer
Using a Geographic Information System to determine the relation between stream quality and geology in the Roberts Creek watershed, Clayton County, Iowa
A geographic information system (GIS) was used to determine the relation between the stream-water quality and underlying geology in Roberts Creek watershed, Clayton County, Iowa, for base-flow conditions during the spring and summer of 1988–90. Geologic, stream, basin and subbasin boundaries, and water-quality sampling-site coverages were created by digitizing available maps. A contour coverage wa
Authors
Stephen J. Kalkhoff
Hydrologic and land-use factors associated with herbicides and nitrate in near-surface aquifers
Selected herbicides, atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) metabolites, and NO−3 were examined in near-surface unconsolidated and bedrock aquifers in the midcontinental USA to study the hydrogeologic, spatial, and seasonal distribution of these contaminants. Groundwater samples were collected from 303 wells during the spring and late summer of 1991. At least one herbicide or
Authors
Michael R. Burkart, Dana W. Kolpin
Application of a geographic information system in analyzing the occurrence of atrazine in groundwater of the mid-continental United States
The US Geological Survey, US Department of Agriculture, and US Environmental Protection Agency are conducting research and regional assessments in support of policy alternatives intended to protect water resources from agricultural chemical contamination. The mid-continent was selected because of the intense row crop agriculture and associated herbicide application in this region. An application o
Authors
M. R. Burkart, D.W. Kolpin
Regional assessment of factors related to herbicides and nitrate in near-surface aquifers of the midcontinent
No abstract available.
Authors
M. R. Burkart, D.W. Kolpin
Groundwater as a nonpoint source of atrazine and deethylatrazine in a river during base flow conditions
Alluvial groundwater adjacent to the main stem river is the principal nonpoint source of atrazine and deethylatrazine in the Cedar River of Iowa after the river has been in base flow conditions for 5 days. Between two sites along a 116-km reach of the Cedar River, tributaries contributed about 25% of the increase in the atrazine and deethylatrazine load, whereas groundwater from the alluvial aquif
Authors
Paul J. Squillace, E. M. Thurman, Edward T. Furlong
A Geographic Information System procedure to quantify drainage-basin characteristics
The Basin Characteristics System (BCS) has been developed to quantify characteristics of a drainage basin. The first of four main BCS processing steps creates four geographic information system (GIS) digital maps representing the drainage divide, the drainage network, elevation contours, and the basin length. The drainage divide and basin length are manually digitized from 1:250,000-scale topogra
Authors
David A. Eash
Hydrologic budget and nitrogen distribution for an agricultural study plot in claypan soil and glacial till near Centralia, Mo.--May 1991 to May 1992
No abstract available.
Authors
Brian P. Kelly, L.N. Plummer
Research and education to improve surface and ground-water quality of a claypan soil--Proceedings of agricultural research to protect water quality
No abstract available.
Authors
E.E. Alberts, D. W. Blevins, N. K. Kitchen, Tony Prato
Selected papers on agricultural chemicals in water resources of the Midcontinental United States
No abstract available.
Authors
D. A. Goolsby, L.L. Boyer, G. E. Mallard