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This report presents the results of statistical analyses used to compute period of record annual and monthly flow duration and low-flow frequency statistics at unregulated sites throughout Oregon. In addition to providing methods for calculating flow duration and low-flow frequency statistics from streamflow records, the report also describes the development of regression equations that relate basin physical and climatic characteristics to flow statistics. The report also provides a discussion of the accuracy and limitations of the flow statistics and regression equations.
...Presents techniques for estimating 7 day, 2 year and 7 day, 10 year flows at continuous and partial record streamflow gaging stations and techniques for estimating these values at ungaged stream sites...