United States Department of Transportation
i
Peak-, Mean-, and Low-Streamflow Regional-Regression Equations for Natural Streamflow in Central and Western Colorado, 2019
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2023-01-01
[PDF-1.76 MB]
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Edition:Final Report
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Abstract:The U.S. Geological Survey (USGS), in cooperation with the Colorado Department of Transportation, developed peak-, mean- and low-streamflow regional-regression equations for estimating various streamflow statistics for natural streamflow in central and western Colorado. At the completion of the streamgage selection process, a total of 418 streamgages, consisting of 15,202 years of record and a mean of approximately 36 years of record per streamgage, were used to develop the peak-streamflow regional-regression equations. No streamgages were used in more than one region. Many streamgages only collect annual-peak streamflow data and do not collect daily streamflow whereas other streamgages are only operated seasonally so daily streamflow is collected only a portion of the year. As a result, 323 of the 418 streamgages were used to develop the mean- and low-streamflow regional regression equations in this study. The estimated annual exceedance-probability discharges for each streamgage were computed using the USGS software program Peak FQ version 7.4. Mean-monthly streamflows and the 7-day minimum and maximum streamflows were computed using the USGS software program SW Toolbox version 1.0.5. Streamflow-duration values were computed using an R script. The peak-, mean- and low-streamflow regional-regression equations were determined using data through water year 2019 (October 1, 2018, through September 30, 2019). Based on previous studies conducted in Colorado and neighboring States and on the availability of data, 97 characteristics (55 basin and 42 climatic characteristics) were evaluated as candidate explanatory variables in the regression analysis. Implementation (Optional)
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