Skip Links

USGS - science for a changing world

Fact Sheet 2012–3038

Calculating Weighted Estimates of Peak Streamflow Statistics

By Timothy A. Cohn, Charles Berenbrock, Julie E. Kiang, and Robert R. Mason, Jr.

Thumbnail of and link to report PDF (300 KB)

Abstract

According to the Federal guidelines for flood-frequency estimation, the uncertainty of peak streamflow statistics, such as the 1-percent annual exceedance probability (AEP) flow at a streamgage, can be reduced by combining the at-site estimate with the regional regression estimate to obtain a weighted estimate of the flow statistic. The procedure assumes the estimates are independent, which is reasonable in most practical situations. The purpose of this publication is to describe and make available a method for calculating a weighted estimate from the uncertainty or variance of the two independent estimates.

First posted March 23, 2012

For additional information contact:
Timothy A. Cohn
U.S. Geological Survey
415 National Center
12201 Sunrise Valley Drive
Reston, VA 20192
Telephone: 703–648–5711
Fax: 703–648–6693
E-mail: tacohn@usgs.gov

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.


Suggested citation:

Cohn, T.A., Berenbrock, Charles, Kiang, J.E., and Mason, R.R., Jr., 2012, Calculating weighted estimates of peak streamflow statistics: U.S. Geological Survey Fact Sheet 2012–3038, 4 p., available at https://pubs.usgs.gov/fs/2012/3038/.




Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://pubsdata.usgs.gov/pubs/fs/2012/3038/index.html
Page Contact Information: GS Pubs Web Contact
Page Last Modified: Tuesday, 29-Nov-2016 18:29:08 EST