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User's manual for Program PeakFQ, annual flood-frequency analysis using Bulletin 17B guidelines

Techniques and Methods 4-B4
By: , , and 
https://doi.org/10.3133/tm4B4

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Abstract

Estimates of flood flows having given recurrence intervals or probabilities of exceedance are needed for design of hydraulic structures and floodplain management. Program PeakFQ provides estimates of instantaneous annual-maximum peak flows having recurrence intervals of 2, 5, 10, 25, 50, 100, 200, and 500 years (annual-exceedance probabilities of 0.50, 0.20, 0.10, 0.04, 0.02, 0.01, 0.005, and 0.002, respectively). As implemented in program PeakFQ, the Pearson Type III frequency distribution is fit to the logarithms of instantaneous annual peak flows following Bulletin 17B guidelines of the Interagency Advisory Committee on Water Data. The parameters of the Pearson Type III frequency curve are estimated by the logarithmic sample moments (mean, standard deviation, and coefficient of skewness), with adjustments for low outliers, high outliers, historic peaks, and generalized skew. This documentation provides an overview of the computational procedures in program PeakFQ, provides a description of the program menus, and provides an example of the output from the program.

Suggested Citation

Flynn, K.M., Kirby, W.H., 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 4-B4, vi, 42 p., https://doi.org/10.3133/tm4B4.

ISSN: 2328-7055 (online)

Publication type Report
Publication Subtype USGS Numbered Series
Title User's manual for Program PeakFQ, annual flood-frequency analysis using Bulletin 17B guidelines
Series title Techniques and Methods
Series number 4-B4
DOI 10.3133/tm4B4
Year Published 2006
Language English
Publisher U.S. Geological Survey
Description vi, 42 p.
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