By Stephen K. Sorenson, Stephen D. Porter,Kimberlee K.B. Akers, Mitchell A. Harris, Stephen J. Kalkhoff, Kathy E. Lee,Linda R. Roberts, and Paul J. Terrio
The full report is available in pdf. Links to the pdf.
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 intensive and productive agricultural regions of the world. The focus of the study was to evaluate the condition of woodedriparian zones and the influence of basin soildrainage characteristics on water quality and biological-community responses. This report includes a description of the study design and site-characterization process, sample-collection and processing methods, laboratory methods, quality-assurance procedures, and summaries of data on nutrients, herbicides and metabolites, stream productivity and respiration, biological communities, habitat conditions, and agriculturalchemical and land-use information.
Purpose and Scope
Effects of Agricultural Intensity on Water Quality and Aquatic Life
Effects of Wooded-Riparian Areas on Water Quality and Aquatic Life
Effects of Soil Characteristics on Water Quality and Aquatic Life
Hypotheses Concerning Relations Between Stream Quality and Selected Factors
Study Design and Methods
Characterization of Wooded-Riparian Zones in Stream Segments
Characterization of Soil Drainage in Stream Basins
Agricultural-Chemical Use and Crop Data
Characterization of Water Quality
Water-Sample Laboratory Analysis
Stream Productivity and Respiration
Periphyton Subsampling and Processing
Chlorophyll a and Ash-Free Mass Analysis
Characterization of Habitat Conditions.
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