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PUBLICATIONS—Open-File Report 2005-1197

Water-quality Data from two Agricultural Drainage Basins in Northwestern Indiana and Northeastern Illinois: III. Biweekly Data, 2000-2002

By  Ronald C. Antweiler, Richard L. Smith, Mary A. Voytek, John-Karl Böhlke and David H. Dupré 

Open-File Report 2005-1197

Revised October 2005

This report is also available as a pdf.


    Methods of data collection and results of analyses are presented for biweekly water-quality data collected from two nearby agricultural drainage basins in northwestern Indiana and northeastern Illinois, the Iroquois River and Sugar Creek.  Over the course of 28 months, from February 2000 to June 2002, 110 discrete samples were collected from a single sampling site on each drainage in northwestern Indiana. Data were collected for nutrients, including nitrate, nitrite, ammonium, total dissolved nitrogen and phosphorus; major inorganic constituents (excepting bicarbonate and carbonate); trace elements; suspended sediment; dissolved trace gases; and chlorophyll-a concentrations. In addition, field measurements of pH, specific conductance, air and water temperature, and dissolved oxygen concentrations were collected for all sampling events.


Conversion Factors



    Purpose and Scope 


Sampling Locations and Times 


Field Methods 

    Collection of Field Data

    Sample Collection 

Methods of Analysis

Quality Control/Quality Assurance 

Results of Analyses


References Cited

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