Kentucky StreamStats incorporates regression equations for estimating instantaneous peak flows with annual exceedance probabilities of 50, 20, 10, 4, 2, 1, 0.5, and 0.2 percent. These peak flows have recurrence intervals of 2, 5, 10, 25, 50, 100, 200, and 500 years, respectively. The report below documents the regression equations available in StreamStats for Kentucky, 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. Users should familiarize themselves with this report before using StreamStats to obtain estimates of peak flows for ungaged sites.
- Hodgkins, G.A. and Martin, G,R., 2003, Estimating the Magnitude of Peak Flows for Streams in Kentucky for Selected Recurrence Intervals, U.S. Geological Survey Water-Resources Investigations Report 03-4180, 68 p., 1 plate.
The peak-flow regression equations are implemented only for hydrologic regions 2, 3, 5, 6, and 7 in Kentucky. Drainage area is the only explanatory variable in these equations. Equations for hydrologic regions 1 and 4 are not implemented at this time because an additional explanatory variable, stream slope, is needed to solve the equations. The capability for StreamStats to compute stream slope in a manner that duplicates the method used in the report by Hodgkins and Martin (2003) has not yet been devised.
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