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Scientific Investigations Report 2008–5126

Scientific Investigations Report 2008–5126
Revision 1.1

Estimating Flow-Duration and Low-Flow Frequency Statistics for Unregulated Streams in Oregon

Prepared in cooperation with the Oregon Department of Transportation

By John Risley, Adam Stonewall, and Tana Haluska

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Table of Contents

Conversion Factors and Datums



Calculating Flow-Duration and Low-Flow Frequency Statistics at Streamflow-Gaging Stations

Estimating Flow-Duration and Low-Flow-Frequency Statistics at Ungaged Stream Sites

Development of Regression Equations for Estimating Flow-Duration and Low-Flow-Frequency Statistics in Oregon

Summary and Conclusions


References Cited



Tables 1-17 are provided in a Microsoft® Excel workbook, which can be accessed at (4.25 MB)

Download the report (PDF, 2.6 MB)

Revision History

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Send questions or comments about this report to the author, John Risley, (503) 251-3279.

For more information about USGS activities in Oregon, visit the USGS Oregon Water Science Center home page.

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