Stephen Kalkhoff (Former Employee)
Science and Products
Filter Total Items: 70
Influence of natural factors on the quality of midwestern streams and rivers Influence of natural factors on the quality of midwestern streams and rivers
Streams flowing through cropland in the Midwestern Corn Belt differ considerably in their chemical and ecological characteristics, even though agricultural land use is highly intensive throughout the entire region. These differences likely are attributable to differences in riparian vegetation, soil properties, and hydrology. This conclusion is based on results from a study of the upper...
Authors
Stephen D. Porter, Mitchell A. Harris, Stephen J. Kalkhoff
Summary of the major water-quality findings from the Eastern Iowa Basins study unit of the National Water-Quality Assessment Program Summary of the major water-quality findings from the Eastern Iowa Basins study unit of the National Water-Quality Assessment Program
An integrated assessment of the water quality in streams and aquifers in the Wapsipinicon, Iowa, Cedar, and Skunk River basins was conducted in 1996 through 1998 as part of the Eastern Iowa Basins (EIWA) study unit of the U.S. Geological Survey's National Water-Quality Assessment Program (NAWQA). The EIWA study unit is one of 59 study units across the Nation designed to assess the status...
Authors
Stephen J. Kalkhoff
Major ground-water findings from the National Water-Quality Assessment Program (NAWQA) in Iowa Major ground-water findings from the National Water-Quality Assessment Program (NAWQA) in Iowa
No abstract available.
Authors
Stephen J. Kalkhoff
Water quality in the eastern Iowa basins, Iowa and Minnesota, 1996-98 Water quality in the eastern Iowa basins, Iowa and Minnesota, 1996-98
The water quality in rivers and streams and in selected aquifers in eastern Iowa and part of southern Minnesota is described and illustrated. Major ions, nitrogen and other nutrients, and pesticides and some of their breakdown compounds were analyzed in both surface and ground water. Biological communities that included fish, invertebrates, and algae, were described in relation to stream...
Authors
Stephen J. Kalkhoff, Kimberlee K. Barnes, Kent Becher, Mark E. Savoca, Douglas J. Schnoebelen, Eric M. Sadorf, Stephen D. Porter, Daniel J. Sullivan
Occurrence of acetochlor and acetochlor metabolites in alluvial aquifers in Iowa Occurrence of acetochlor and acetochlor metabolites in alluvial aquifers in Iowa
No abstract available.
Authors
Stephen J. Kalkhoff, Mark E. Savoca, Eric M. Sadorf, Dana W. Kolpin, Earl M. Thurman
Occurrence and distribution of chloroacetanilide and triazine pesticide metabolites in streams in eastern Iowa Occurrence and distribution of chloroacetanilide and triazine pesticide metabolites in streams in eastern Iowa
No abstract available.
Authors
Stephen J. Kalkhoff, E.M. Thurman
Science and Products
Filter Total Items: 70
Influence of natural factors on the quality of midwestern streams and rivers Influence of natural factors on the quality of midwestern streams and rivers
Streams flowing through cropland in the Midwestern Corn Belt differ considerably in their chemical and ecological characteristics, even though agricultural land use is highly intensive throughout the entire region. These differences likely are attributable to differences in riparian vegetation, soil properties, and hydrology. This conclusion is based on results from a study of the upper...
Authors
Stephen D. Porter, Mitchell A. Harris, Stephen J. Kalkhoff
Summary of the major water-quality findings from the Eastern Iowa Basins study unit of the National Water-Quality Assessment Program Summary of the major water-quality findings from the Eastern Iowa Basins study unit of the National Water-Quality Assessment Program
An integrated assessment of the water quality in streams and aquifers in the Wapsipinicon, Iowa, Cedar, and Skunk River basins was conducted in 1996 through 1998 as part of the Eastern Iowa Basins (EIWA) study unit of the U.S. Geological Survey's National Water-Quality Assessment Program (NAWQA). The EIWA study unit is one of 59 study units across the Nation designed to assess the status...
Authors
Stephen J. Kalkhoff
Major ground-water findings from the National Water-Quality Assessment Program (NAWQA) in Iowa Major ground-water findings from the National Water-Quality Assessment Program (NAWQA) in Iowa
No abstract available.
Authors
Stephen J. Kalkhoff
Water quality in the eastern Iowa basins, Iowa and Minnesota, 1996-98 Water quality in the eastern Iowa basins, Iowa and Minnesota, 1996-98
The water quality in rivers and streams and in selected aquifers in eastern Iowa and part of southern Minnesota is described and illustrated. Major ions, nitrogen and other nutrients, and pesticides and some of their breakdown compounds were analyzed in both surface and ground water. Biological communities that included fish, invertebrates, and algae, were described in relation to stream...
Authors
Stephen J. Kalkhoff, Kimberlee K. Barnes, Kent Becher, Mark E. Savoca, Douglas J. Schnoebelen, Eric M. Sadorf, Stephen D. Porter, Daniel J. Sullivan
Occurrence of acetochlor and acetochlor metabolites in alluvial aquifers in Iowa Occurrence of acetochlor and acetochlor metabolites in alluvial aquifers in Iowa
No abstract available.
Authors
Stephen J. Kalkhoff, Mark E. Savoca, Eric M. Sadorf, Dana W. Kolpin, Earl M. Thurman
Occurrence and distribution of chloroacetanilide and triazine pesticide metabolites in streams in eastern Iowa Occurrence and distribution of chloroacetanilide and triazine pesticide metabolites in streams in eastern Iowa
No abstract available.
Authors
Stephen J. Kalkhoff, E.M. Thurman