Stephen Kalkhoff (Former Employee)
Science and Products
Filter Total Items: 70
Water quality and habitat conditions in upper Midwest streams relative to riparian vegetation and soil characteristics, August 1997 : study design, methods, and data Water quality and habitat conditions in upper Midwest streams relative to riparian vegetation and soil characteristics, August 1997 : study design, methods, and data
Water-chemistry, biological, and habitat data were collected from 70 sites on Midwestern streams during August 1997 as part of an integrated, regional water-quality assessment by the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program. The study area includes the Corn Belt region of southern Minnesota, eastern Iowa, and west-central Illinois, one of the most...
Authors
S. Sorenson, S. Porter, K.B. Akers, M.A. Harris, S. J. Kalkhoff, K. Lee, L. Roberts, P. Terrio
Occurrence of acetanilide herbicide metabolites in tile runoff and ground Occurrence of acetanilide herbicide metabolites in tile runoff and ground
No abstract available.
Authors
E.M. Thurman, D.W. Kolpin, S. J. Kalkhoff, P. Phillips
Degradation of chloroacetanilide herbicides: The prevalence of sulfonic and oxanilic acid metabolites in Iowa groundwaters and surface waters Degradation of chloroacetanilide herbicides: The prevalence of sulfonic and oxanilic acid metabolites in Iowa groundwaters and surface waters
Water samples were collected from 88 municipal wells throughout Iowa during the summer and were collected monthly at 12 stream sites in eastern Iowa from March to December 1996 to study the occurrence of the sulfonic and oxanilic metabolites of acetochlor, alachlor, and metolachlor. The sulfonic and oxanilic metabolites were present in almost 75% of the groundwater samples and were...
Authors
Stephen Kalkhoff, Dana Kolpin, E.M. Thurman, I. Ferrer, D. Barcelo
Organochlorine compounds in a sediment core from Coralville reservoir, Iowa Organochlorine compounds in a sediment core from Coralville reservoir, Iowa
No abstract available.
Authors
S. J. Kalkhoff, Peter C. Van Metre
Occurrence of selected herbicides and herbicide degradation products in Iowa's Ground Water, 1995 Occurrence of selected herbicides and herbicide degradation products in Iowa's Ground Water, 1995
Herbicide compounds were prevalent in ground water across Iowa, being detected in 70% of the 106 municipal wells sampled during the summer of 1995. Herbicide degradation products were three of the four most frequently detected compounds for this study. The degradation product alachlor ethanesulfonic acid was the most frequently detected compound (65.1%), followed by atrazine (40.6%), and...
Authors
D.W. Kolpin, S. J. Kalkhoff, D. Goolsby, D. Sneck-Fahrer, E.M. Thurman
Relation between stream-water quality and geohydrology during base-flow conditions, Roberts creek watershed, Clayton County, Iowa Relation between stream-water quality and geohydrology during base-flow conditions, Roberts creek watershed, Clayton County, Iowa
An investigation to determine the relation between stream water quality and geohydrology in the Roberts Creek watershed, Clayton County, Iowa, was conducted during selected base-flow periods in 1988-90. Discharge measurements were made and water samples collected for analyses of nutrients and selected herbicides in 19 subbasins along the main stem and tributaries of Roberts Creek. The...
Authors
Stephen Kalkhoff
Agricultural chemicals in ground and surface water in a small watershed in Clayton County, Iowa, 1988-91 Agricultural chemicals in ground and surface water in a small watershed in Clayton County, Iowa, 1988-91
An investigation was conducted from October 1988 through September 1991 to (1) describe the quality of water in shallow, unconsolidated materials in the 1.09-square-mile Deer Creek watershed in Clayton County, Iowa, and to (2) define the quantity and seasonal distribution of selected agricultural chemicals in water from this watershed. Surficial unconsolidated aquifer materials that...
Authors
S. J. Kalkhoff, B.D. Schaap
Suspended sediment and stream discharge in Bloody Run and Sny Magill watershed, water year 1992 Suspended sediment and stream discharge in Bloody Run and Sny Magill watershed, water year 1992
Hydrologic data were collected in the Bloody Run and Sny Magill watersheds in Clayton County, Iowa during the 1992 Water Year (October 1, 1991 to September 30, 1992) to provide data on suspended sediment and stream discharge from these watersheds. Suspended-sediment samples were collected daily during normal flow and several times during rainstorms. Stream stage was recorded continuously...
Authors
Stephen Kalkhoff, David Eash
Hydrologic data for the Big Spring basin, Clayton County, Iowa, water year 1991 Hydrologic data for the Big Spring basin, Clayton County, Iowa, water year 1991
Hydrologic data were collected in the Big Spring Basin located in Clayton County, Iowa, during the 1991 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
S. J. Kalkhoff, R.L. Kuzniar
National Water-Quality Assessment Program— Eastern Iowa basins National Water-Quality Assessment Program— Eastern Iowa basins
No abstract available.
Authors
Stephen Kalkhoff
Using a Geographic Information System to determine the relation between stream quality and geology in the Roberts Creek watershed, Clayton County, Iowa 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...
Authors
Stephen Kalkhoff
Water quality of Corydon Reservoir before implementation of agricultural best-management practices in the basin, Wayne County, Iowa, September 1990 to September 1991 Water quality of Corydon Reservoir before implementation of agricultural best-management practices in the basin, Wayne County, Iowa, September 1990 to September 1991
A hydrologic investigation to define the water quality of Corydon Reservoir before implementation of agricultural best-management practices in the basin was conducted from September 1990 to September 1991. Runoff from the 1,680-acre basin is the primary source of water to the 58-acre reservoir. Current water quality of the reservoir is affected substantially by runoff from the...
Authors
S. J. Kalkhoff
Science and Products
Filter Total Items: 70
Water quality and habitat conditions in upper Midwest streams relative to riparian vegetation and soil characteristics, August 1997 : study design, methods, and data Water quality and habitat conditions in upper Midwest streams relative to riparian vegetation and soil characteristics, August 1997 : study design, methods, and data
Water-chemistry, biological, and habitat data were collected from 70 sites on Midwestern streams during August 1997 as part of an integrated, regional water-quality assessment by the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program. The study area includes the Corn Belt region of southern Minnesota, eastern Iowa, and west-central Illinois, one of the most...
Authors
S. Sorenson, S. Porter, K.B. Akers, M.A. Harris, S. J. Kalkhoff, K. Lee, L. Roberts, P. Terrio
Occurrence of acetanilide herbicide metabolites in tile runoff and ground Occurrence of acetanilide herbicide metabolites in tile runoff and ground
No abstract available.
Authors
E.M. Thurman, D.W. Kolpin, S. J. Kalkhoff, P. Phillips
Degradation of chloroacetanilide herbicides: The prevalence of sulfonic and oxanilic acid metabolites in Iowa groundwaters and surface waters Degradation of chloroacetanilide herbicides: The prevalence of sulfonic and oxanilic acid metabolites in Iowa groundwaters and surface waters
Water samples were collected from 88 municipal wells throughout Iowa during the summer and were collected monthly at 12 stream sites in eastern Iowa from March to December 1996 to study the occurrence of the sulfonic and oxanilic metabolites of acetochlor, alachlor, and metolachlor. The sulfonic and oxanilic metabolites were present in almost 75% of the groundwater samples and were...
Authors
Stephen Kalkhoff, Dana Kolpin, E.M. Thurman, I. Ferrer, D. Barcelo
Organochlorine compounds in a sediment core from Coralville reservoir, Iowa Organochlorine compounds in a sediment core from Coralville reservoir, Iowa
No abstract available.
Authors
S. J. Kalkhoff, Peter C. Van Metre
Occurrence of selected herbicides and herbicide degradation products in Iowa's Ground Water, 1995 Occurrence of selected herbicides and herbicide degradation products in Iowa's Ground Water, 1995
Herbicide compounds were prevalent in ground water across Iowa, being detected in 70% of the 106 municipal wells sampled during the summer of 1995. Herbicide degradation products were three of the four most frequently detected compounds for this study. The degradation product alachlor ethanesulfonic acid was the most frequently detected compound (65.1%), followed by atrazine (40.6%), and...
Authors
D.W. Kolpin, S. J. Kalkhoff, D. Goolsby, D. Sneck-Fahrer, E.M. Thurman
Relation between stream-water quality and geohydrology during base-flow conditions, Roberts creek watershed, Clayton County, Iowa Relation between stream-water quality and geohydrology during base-flow conditions, Roberts creek watershed, Clayton County, Iowa
An investigation to determine the relation between stream water quality and geohydrology in the Roberts Creek watershed, Clayton County, Iowa, was conducted during selected base-flow periods in 1988-90. Discharge measurements were made and water samples collected for analyses of nutrients and selected herbicides in 19 subbasins along the main stem and tributaries of Roberts Creek. The...
Authors
Stephen Kalkhoff
Agricultural chemicals in ground and surface water in a small watershed in Clayton County, Iowa, 1988-91 Agricultural chemicals in ground and surface water in a small watershed in Clayton County, Iowa, 1988-91
An investigation was conducted from October 1988 through September 1991 to (1) describe the quality of water in shallow, unconsolidated materials in the 1.09-square-mile Deer Creek watershed in Clayton County, Iowa, and to (2) define the quantity and seasonal distribution of selected agricultural chemicals in water from this watershed. Surficial unconsolidated aquifer materials that...
Authors
S. J. Kalkhoff, B.D. Schaap
Suspended sediment and stream discharge in Bloody Run and Sny Magill watershed, water year 1992 Suspended sediment and stream discharge in Bloody Run and Sny Magill watershed, water year 1992
Hydrologic data were collected in the Bloody Run and Sny Magill watersheds in Clayton County, Iowa during the 1992 Water Year (October 1, 1991 to September 30, 1992) to provide data on suspended sediment and stream discharge from these watersheds. Suspended-sediment samples were collected daily during normal flow and several times during rainstorms. Stream stage was recorded continuously...
Authors
Stephen Kalkhoff, David Eash
Hydrologic data for the Big Spring basin, Clayton County, Iowa, water year 1991 Hydrologic data for the Big Spring basin, Clayton County, Iowa, water year 1991
Hydrologic data were collected in the Big Spring Basin located in Clayton County, Iowa, during the 1991 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
S. J. Kalkhoff, R.L. Kuzniar
National Water-Quality Assessment Program— Eastern Iowa basins National Water-Quality Assessment Program— Eastern Iowa basins
No abstract available.
Authors
Stephen Kalkhoff
Using a Geographic Information System to determine the relation between stream quality and geology in the Roberts Creek watershed, Clayton County, Iowa 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...
Authors
Stephen Kalkhoff
Water quality of Corydon Reservoir before implementation of agricultural best-management practices in the basin, Wayne County, Iowa, September 1990 to September 1991 Water quality of Corydon Reservoir before implementation of agricultural best-management practices in the basin, Wayne County, Iowa, September 1990 to September 1991
A hydrologic investigation to define the water quality of Corydon Reservoir before implementation of agricultural best-management practices in the basin was conducted from September 1990 to September 1991. Runoff from the 1,680-acre basin is the primary source of water to the 58-acre reservoir. Current water quality of the reservoir is affected substantially by runoff from the...
Authors
S. J. Kalkhoff