The reports below document the regression equations available in StreamStats for Tennessee, 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 streamflow statistics for ungaged sites.
- Ladd, D.E., and Law, G.S., 2007, Tennessee StreamStats: A Web-Enabled Geographic Information System Application for Automating the Retrieval and Calculation of Streamflow Statistics: U.S. Geological Survey Fact Sheet 2007-3081, 2 p.
- Law, G.S. and Tasker, G.D., 2003, Flood-frequency prediction methods for unregulated streams of Tennessee, 2000: U.S. Geological Survey Scientific Investigations Report 03-4176, 79 p.
- Bingham, R.H., 1986, Regionalization of low-flow characteristics of Tennessee streams: U.S. Geological Survey Scientific Investigations Report 85-4191, 63 p.
General information on the Interactive Map application, as well as specific sources and computation methods for basin characteristics are available here.
NOTE: A new report is available for Tennessee that provides regression equations for estimating the 7-day, 10-year and 30-day, 5-year low flows, the mean annual flow, the mean summer streamflow (June through August), and flows exceeded 99.5, 99, 98, 95, 90, 80, 70, 60, 50, 40, 30, 20, and 10 percent of the time. The equations from this report have not yet been incorporated into StreamStats. The citation for this report is:
A stand-alone computer program has been developed to estimate the flow statistics from the new report. This computer requires manual entry of the basin characteristics for ungaged sites to obtain estimates of the flow statistics. All of the basin characteristics needed to solve the new equations can be obtained from StreamStats. People who are interested in obtaining estimates of the new flow statistics should use StreamStats to obtain the basin characteristics for their sites of interest, and then run the stand-alone program to get estimates of the flow statistics. The new report and the stand-alone program can be downloaded by clicking on the embedded link in the citation above. Users should note that there are some differences in the naming of the basin characteristics between StreamStats and the stand-alone program. The geology factor needed in the stand-alone program is named the streamflow-recession index in StreamStats. Also, the soil fact needed in the stand-alone program is named the percent area underlain by soil permeability of at least 2 in/hr in StreamStats.
The equation for estimating the 7-day, 10-year low flow in the new report by Law and others (2009) supersedes the equation for the same statistic by Bingham (1986). A new StreamStats version 2 application is in preparation for Tennessee, which will incorporate the new equations by Law and others (2009) and add several new analysis tools. Please return to this web site occasionally for a notice of the availability of the new application.
StreamStats for Tennessee was developed in cooperation with the Tennessee Department of Transportation and the Tennessee Department of Environment and Conservation.
Contact Us if you experience any problems with this application.