Water Resources of the United States
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: The PeakFQ software has been migrated to an R package and web application. Older versions of the software are available on this page for archive purposes only.
Current Version: | 7.5.1 (Beta) 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. |
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 |
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Version |
Operating System |
Download File |
Description |
7.5.1 (Beta) |
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. |
|||
7.5 (Beta) |
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 |
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 |
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 |
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 |
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 |
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 |
Windows XP |
README.TXT and PKFQWin_5.2.exe (5.38MB) | |
4.1 |
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) |
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