Scientific Investigations Report 2008–5126
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5126
Revision 1.1
Prepared in cooperation with the Oregon Department of Transportation
By John Risley, Adam Stonewall, and Tana Haluska
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Calculating Flow-Duration and Low-Flow Frequency Statistics at Streamflow-Gaging Stations
Estimating Flow-Duration and Low-Flow-Frequency Statistics at Ungaged Stream Sites
Figure 1. Level III ecoregions of Oregon.
Figure 2. Location of streamflow-gaging stations used in the regression equations.
Figure 3. Residuals of a simple 7Q10 regression equation for the entire study area.
Figure 4. Ten modeling regions used for the regression equations.
Table 1. Description of streamflow-gaging stations used in regression equations for estimating flow-duration and low-flow frequency statistics in Oregon.
Table 2. Selection of streamflow-gaging stations and their number of years of record used in the annual and monthly regression equations for estimating flow-duration and low-flow frequency statistics in Oregon.
Table 3. Monthly consumptive-use adjustments.
Table 4. Annual and monthly flow duration and low-flow frequency statistics for each streamflow-gaging station used in the regression equations.
Table 5. Description of basin characteristics used in regression equations to predict flow-duration and low-flow frequency statistics in Oregon.
Table 6. Basin characteristics for the streamflow-gaging stations used in the regression equations.
Table 7. Regression analysis results for estimating flow-duration and low-flow frequency statistics based on data from Region 1.
Table 8. Regression analysis results for estimating flow-duration and low-flow frequency statistics based on data from Region 2.
Table 9. Regression analysis results for estimating flow-duration and low-flow frequency statistics based on data from Region 3.
Table 10. Regression analysis results for estimating flow-duration and low-flow frequency statistics based on data from Region 4.
Table 11. Regression analysis results for estimating flow-duration and low-flow frequency statistics based on data from Region 5.
Table 12. Regression analysis results for estimating flow-duration and low-flow frequency statistics based on data from Region 6.
Table 13. Regression analysis results for estimating flow-duration and low-flow frequency statistics based on data from Region 7.
Table 14. Regression analysis results for estimating flow-duration and low-flow frequency statistics based on data from Region 8.
Table 15. Regression analysis results for estimating flow-duration and low-flow frequency statistics based on data from Region 9.
Table 16. Regression analysis results for estimating flow-duration and low-flow frequency statistics based on data from Region 10.
Table 17. Maximum and minimum values of basin characteristics used in the regression equations.
This report is available online in Portable Document Format (PDF). If you do not have the Adobe Reader, it is available for free download from Adobe Systems Incorporated.
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.
U.S. Department of the Interior | U.S. Geological Survey
URL: http://pubs.usgs.gov/sir/2008/5126
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