Description

Estimates of the magnitude and frequency of flood-peak discharges and flood hydrographs are used for a variety of purposes, such as the design of bridges, culverts, and flood-control structures, and for the management and regulation of flood plains. These estimates are often needed at ungaged sites where no observed flood data are available. To provide simple methods of estimating flood-peak discharges, the U.S. Geological Survey (USGS) has developed and published regression equations for every State, the Commonwealth of Puerto Rico, and a number of metropolitan areas in the United States. These equations have been compiled into the National Flood Frequency (NFF) Program. NOTICE: NFF has been replaced with the National Streamflow Statistics (NSS) program. NSS contains all of the NFF functionality and equations as well as low flow and other probability equations.

URL

https://water.usgs.gov/software/NFF/

---

Last modified: July 10, 2020, 10:49 a.m.