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USING A GEOGRAPHIC INFORMATION SYSTEM TO DETERMINE THE RELATION BETWEEN STREAM QUALITY AND GEOLOGY IN THE ROBERTS CREEK WATERSHED, CLAYTON COUNTY, IOWA 1
Author(s) -
Kalkhoff S. J.
Publication year - 1993
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1993.tb03261.x
Subject(s) - watershed , geographic information system , hydrology (agriculture) , water quality , base flow , geology , structural basin , sampling (signal processing) , drainage basin , geomorphology , cartography , remote sensing , geography , geotechnical engineering , ecology , filter (signal processing) , machine learning , computer science , computer vision , biology
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.