US Army Corps of Engineers
Hydrologic Engineering Center

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Updated: 28 September 2021

Q: How do I install HEC-FDA 1.4?
A: Information about installing HEC-FDA 1.4 is included in the Release Notes.

Q: Can I install more than one version of HEC-FDA on my computer?
A: Yes, as long as each version is installed in different directories.

Q: Can I import studies created in prior versions of HEC-FDA 1.4?
A: Yes. HEC-FDA Version 1.4 can directly import studies created in Versions 1.2.4, 1.2.5, and 1.2.5a. However,once imported into Version 1.4, the study database will be converted to a new format and will no longer be compatible with earlier versions of the program. Studies created in Version 1.2 will first have to be converted to Version 1.2.5a before they can be imported into Version 1.4. See the Release Notes for more information.

Q: Which version of the program is the most up-to-date certified release?
A: Version 1.4.3 is the most up-to-date release certified for use on USACE flood risk management planning studies.

Q: How should we handle the fact that USACE's certified planning model, HEC-FDA, does not comply with the current federal guidelines for flood frequency analysis as defined by Bulletin 17C? Namely, the uncertainty analysis for the analytical flow frequency curve is not correct per current guidelines.
A: As noted, Bulletin 17C provides current federal guidelines for flood frequency analysis. A difference from Bulletin 17B is a wider confidence interval around the estimated frequency curve, reflecting greater uncertainty. This greater uncertainty is maintained in HEC-FDA 2.0, which is currently in beta development. Until HEC-FDA 2.0 is released and certified for use on USACE Planning studies, HEC-FDA 1.4.2 with Bulletin 17B uncertainty should continue to be used in support of Planning studies.