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U.S. Geological Survey Open-File Report 2005-1053

Water-quality Data from two Agricultural Drainage Basins in Northwestern Indiana and Northeastern Illinois: II. Diel Data, 1999-2001

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

This report is available as a pdf.


Methods of data collection and results of analyses are presented for diel water-quality data collected from two nearby agricultural drainages in northwestern Indiana, the Iroquois River and Sugar Creek.  During four separate sampling trips, in June and September 1999, May 2000 and September 2001, 208 discrete water samples were collected to document the aqueous chemistry over the course of 2 to 4 days on each of these drainages. Data were collected for nutrients, dissolved organic carbon, suspended sediment, major inorganic constituents (major cations and anions), trace elements, total bacterial counts, and chlorophyll-a concentrations. In addition, field measurements of water temperature, specific conductance, pH, and dissolved oxygen concentrations were made during all trips.


Conversion Factors



Purpose and Scope 


Sampling Locations and Times 


Methods of Data Collection

Field Parameters 

Collection of Water Samples

Processing of Samples 

Methods of Analysis

Quality Control/Quality Assurance 

Results of Analyses


References Cited


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