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Michigan Water Science Center

Calculation of Streamflow Statistics for Ontario and the Great Lakes States

In Cooperation with Environment Canada's National Water Research Institute and the Great Lakes Protection Fund

By: Andrew R. Piggott* and Brian P. Neff

* National Water Research Institute, Environment Canada Burlington, Ontario, Canada

U.S. Geological Survey Open File Report 2005-1295

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Basic, flow-duration, and n-day frequency statistics were calculated for 779 current and historical streamflow gages in Ontario and 3,157 streamflow gages in the Great Lakes states with length-of-record daily mean streamflow data ending on December 31, 2000 and September 30, 2001, respectively. The statistics were determined using the U.S. Geological Survey's SWSTAT and IOWDM, ANNIE, and LIBANNE software and Linux shell and PERL programming that enabled the mass processing of the data and calculation of the statistics. Verification exercises were performed to assess the accuracy of the processing and calculations. The statistics and descriptions, longitudes and latitudes, and drainage areas for each of the streamflow gages are summarized in ASCII text files and ESRI shapefiles.


Piggott, A.R., and B.P. Neff, 2005, Calculation of Streamflow Statistics for Ontario and the Great Lakes States: Date Posted: August 31, 2005, U.S. Geological Survey Open File Report 2005-1295, 12 p. []


Calculation of Streamflow Statistics
Verification Exercises
References Cited
Appendix: Streamflow Statistics (Download data - zip file - 906 K Bytes)

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For further information, contact:
Jim Nicholas, Director
U.S. Geological Survey
Michigan Water Science Center
6520 Mercantile Way, Suite 5
Lansing, MI 48911-5991
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