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Water Resources of the United States

NFF, Version 3.2

National Flood Frequency 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.

The NFF program and database have not been changed since 2004 and will no longer be updated or supported.

See the National Streamflow Statistics (NSS) Program.



Select the following links to retrieve the two distribution files required for a complete installation of NFF. See the README file for installation instructions.

NFFv3.2.exe (7.95 Mb)

self-extracting executable of the NFF software

NFFv3_2004-12-14.mdb (12.2 Mb)

Microsoft Access data base needed to run NFF - Last update 12/14/2004

References to commercial vendors of software products or services is for informational purposes only and does not imply endorsement by the U.S. Government.

Please note! The database for NFF will be changed frequently to update and add new equations. Please check this web site often to determine if a new version of the data base is available. The version history link will document any changes made to the data base or the software.


How to order U.S. Geological Survey printed documentation

Fact sheet describing NFF program:

Perl, C.D., and Ries, K.G., III, 2002, The National Flood Frequency Program, Version 3: U.S. Geological Survey Fact Sheet 084-02, 4 p.

NFF report, including user's manual:

Ries, K.G., III, and Crouse, M.Y., 2002, The National Flood Frequency Program, Version 3: A Computer Program for Estimating Magnitude and Frequency of Floods for Ungaged Sites, 2002: U.S. Geological Survey Water-Resources Investigations Report 02-4168, 42 p.

Documentation for individual States

Point of contact for NFF:
U.S. Geological Survey
Office of Surface Water
12201 Sunrise Valley Dr., MS415
Reston, VA 20192
(electronic mail: h2osoft@usgs.gov)

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