Skip to main content
U.S. flag

An official website of the United States government

Using a Geographic Information System to determine the relation between stream quality and geology in the Roberts Creek watershed, Clayton County, Iowa

December 1, 1993

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 was created from digital line-graph data. The areal extent of geologic units subcropping in each subbasin was quantified with GIS, and the results then were output and joined with the discharge and water-quality data for statistical analyses. Illustrations showing the geology of the study area and the results of the study were prepared using GIS. By using GIS and a statistical software package, a weak but statistically significant relation was found between the water temperature, pH, and nitrogen concentrations in Roberts Creek and the underlying geology during base-flow conditions.

Citation Information

Publication Year 1993
Title Using a Geographic Information System to determine the relation between stream quality and geology in the Roberts Creek watershed, Clayton County, Iowa
DOI 10.1111/j.1752-1688.1993.tb03261.x
Authors Stephen J. Kalkhoff
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of the American Water Resources Association
Series Number
Index ID 70169045
Record Source USGS Publications Warehouse
USGS Organization Iowa Water Science Center