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A number of different documents have been created to describe the use and technical background of HEC-FDA.

User's Manual (CPD-72) Description of the use and application of the program.
DOS Programs Program describing the use of DOS with HEC-FDA.
Release Notes Description of the changes that occurred at each new release including bug repairs, new capabilities, and changes in operation.
Certification Documentation Description of the certification process for HEC-FDA.
HEC-FDA (Version 1.4) USACE HQ Certification MEMORANDUM FOR from USACE HQ stating that HEC-FDA Version 1.4 has been certified for use by USACE offices when conducting flood risk management (FRM) studies. This certification also applies to the Versions 1.4.1, 1.4.2, and 1.4.3 releases.
HEC-FDA (Version 1.4) FRM-PCX Transition Guidance MEMORANDUM FOR from FRM-PCX describing when USACE study teams should transition from using HEC-FDA 1.2.5 to HEC-FDA 1.4
Technical Reference Manual (CPD-72a) Description uncertainty estimates for graphical (non-analytic) frequency curves.