397780 - Bulletin 17c: Updated Federal Guidelines for Flood Frequency Analysis
Tuesday, June 5
4:00 PM - 5:30 PM
Location: Greenway IJ
John England, Jr.
Hydrologic Hazards Lead
U.S. Army Corps of Engineers, Risk Management Center
Julie Kiang, Reston, VA – USGS; Beth Faber, Davis, CA – USACE HEC; Andrea Veilleux, Sacramento, CA – USGS; Michael Bartles, Davis, CA – USACE HEC
Flood-frequency analysis of peak streamflow records provides the essential statistical interpretation of hydrologic data for estimating flood risk and for floodplain mapping. This presentation provides an overview on flood-frequency analysis of peak streamflow data based on the methods adopted in the new federal guidelines, Bulletin 17C. These new methods include a generalized method-of-moments estimator, the Expected Moments Algorithm (EMA), for dealing with zeros, low outliers and historical data. It also employs a generalized version of the Grubbs-Beck test (MGB) for the identification of potentially influential low floods (PILFs). An overview of Bulletin 17C and changes implemented will be described. How to properly characterize flood peaks for inclusion in a Bulletin 17C analysis, and software used to conduct the analysis, will be presented. Training materials under development and possible future updates to the Bulletin will also be mentioned.
*We also request to present a 4-hour, hands-on short course on this topic