Minnesota StreamStats incorporates regression equations for estimating instantaneous peak flows with annual exceedance probabilities of 66.7, 50, 20, 10, 4, 2, 1, and 0.002 percent. These peak flows have recurrence intervals of 1.5, 2, 5, 10, 25, 50, 100, and 500 years, respectively. The report below documents the regression equations available in StreamStats for Minnesota, the methods used to develop the equations and to measure the basin characteristics used in the equations, and the errors associated with the estimates obtained from the equations. This report describes the development of a region-of-influence method for estimating peak flows as well as the development of regression equations. StreamStats has not implemented the region-of-influence method. Users should familiarize themselves with the report before using StreamStats to obtain estimates of peak flows for ungaged sites.
- Lorenz, D.L., Sanocki, C.A., and Kocian, M.J., 2009, Techniques for estimating the magnitude and frequency of peak flows on Small Streams in Minnesota based on data through water year 2005: U.S. Geological Survey Scientific Investigations Report 2009–5250, 54 p.
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