USGS - science for a changing world

Water Resources of the United States

PeakFQ

Flood Frequency Analysis Based on Bulletin 17C and recommendations of the Advisory Committee on Water Information (ACWI) Subcommittee on Hydrology (SOH) Hydrologic Frequency Analysis Work Group (HFAWG)


Program PeakFQ implements the Bulletin 17C procedures for flood-frequency analysis of streamflow records, providing estimates of flood magnitudes and their corresponding variance for a range of annual exceedance probabilities. The output also includes estimates of the parameters of the log-Pearson Type III frequency distribution, including the logarithmic mean, standard deviation, skew, and mean square error of the skew. The output graph includes the fitted frequency curve, systematic peaks, low outliers, censored peaks, interval peaks, historic peaks, thresholds, and confidence limits.

PeakFQ reads annual peaks in the standard peakfq (WATSTORE) text format available from NWISWeb at https://nwis.waterdata.usgs.gov/usa/nwis/peak

NOTICE: PeakFQ 7.5.1 (Beta) implements changes to weighting regional and at-site skew to address computational issues in earlier versions. For detailed information, please visit this page.

To download the latest release, please see below.

Current Version: 7.5.1 (Beta)
Release Date: March 4, 2024
Documentation:
Version History (see below)
Veilleux, A.G., Cohn, T.A., Flynn, K.M., Mason, R.R., Jr., and Hummel, P.R., 2014, Estimating magnitude and frequency of floods using the PeakFQ 7.0 program: U.S. Geological Survey Fact Sheet 2013-3108, 2 p., https://dx.doi.org/10.3133/fs20133108
Flynn, K.M., Kirby, W.H., and Hummel, P.R., 2006, User's manual for program PeakFQ, Annual Flood Frequency Analysis Using Bulletin 17B Guidelines: U.S. Geological Survey Techniques and Methods Book 4, Chapter B4, 42 pgs.
[ On-line | PDF | chm ]
Bulletin 17C:
England, J.F., Jr., Cohn, T.A., Faber, B.A., Stedinger, J.R., Thomas, W.O., Jr., Veilleux, A.G., Kiang, J.E., and Mason, R.R., Jr., 2018, Guidelines for determining flood flow frequency--Bulletin 17C: U.S. Geological Survey Techniques and Methods, book 4, chap. B5, 148 p., https://doi.org/10.3133/tm4B5.
Software User Rights Notice
NOTE: Electronic and/or print versions of many U.S. Geological Survey reports can be found at the Publications Warehouse (https://pubs.er.usgs.gov/)
Contact: U.S.Geological Survey
Analysis and Prediction Branch
415 National Center
Reston, VA 20192
h2osoft@usgs.gov

Distribution Files

Version

Operating System

Download File

Description

7.5.1 (Beta)

4Feb2024

Windows 10

Readme.txt Installation and usage information, version history, and known bugs
PeakFQ_7.5.1.exe (Beta) Self-installing executable (3.2 MB)
PeakFQ_7.5.1.src.zip (Beta) Source code (783 KB)

The following software distributions have been superseded and are replaced by the newer version above.
These versions are provided online for historical reference only.
There is no support for installation or use of these versions.

7.5 (Beta)

6Feb2024

Windows 10

Readme.txt Installation and usage information, version history, and known bugs
PeakFQ.7.5.exe (Beta) Self-installing executable (2.7 MB)
PeakFQ_7.5_src.zip (Beta) Source code (782 KB)

7.4.1

24Jul2023

Windows 10

Readme.txt Installation and usage information, version history, and known bugs
PeakFQ.7.4.1.exe Self-installing executable (1.8 MB)
PeakFQ.7.4.1.src.zip Source code (773 KB)

7.4

28Jun2022

Windows 10

Readme.txt Installation and usage information, version history, and known bugs
PeakFQ.7.4.exe Self-installing executable (1.8 MB)
PeakFQ.7.4.src.zip Source code (747 KB)

7.3

21Nov2019

Windows 10

Readme.txt Installation and usage information, version history, and known bugs
PeakFQ.7.3.exe Self-installing executable (2.6 MB)
PeakFQ.7.3.src.zip a> Source code (728 KB)

7.2

28Mar2018

Windows 7/8/10

Readme.txt Installation and usage information
PeakFQ.7.2.exe Self-installing executable, includes executable program, sample data, and documentation (1.57MB)
PeakFQ7.2.src.zip Source code (2.13MB)
   

7.1

14Mar2014

Windows 7/8

readme.txt Installation and usage information
PeakFQ_7.1.exe Self-installing executable, includes executable program, sample data, and documentation (1.50MB)
PeakFQ7.1.src.zip Source code (2.13MB)
release.pdf Version history through version 7.1

5.2

01Nov2007

Windows XP

README.TXT and PKFQWin_5.2.exe (5.38MB)

4.1

25Feb2002

MS-DOS

README.TXT and peakfq4_1.exe (2.51MB)

Sun Solaris

README.TXT and peakfq4.1.Solaris.tar.gz (1.3MB)

Unix

README.TXT and peakfq4.1.source.tar.gz (705K)

USGS Home :: Biology :: Geology :: Geography :: Water Intranet :: USGS Intranet :: Site Map

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: https://water.usgs.gov/software/PeakFQ/
Page Contact Information: Office of Surface Water