DEPARTMENT OF THE ARMY
ETL 1110-2-367
U.S. Army Corps of Engineers
Washington, DC 20314-1000
CECW-EH-Y
Technical Letter
No. 1110-2-367
31 March 1995
Engineering and Design
INTERIOR FLOOD HYDROLOGY
1. Purpose. This ETL provides guidance for conducting hydrologic engineering flood damage reduction
analyses of interior areas. The Hydrologic Engineering Center Interior Flood Hydrology
(HEC-IFH) program is the primary tool used to demonstrate the analysis procedures presented.
2. Applicability. This guidance applies to HQUSACE elements, major subordinate commands, districts,
laboratories, and field operating activities having civil works responsibilities.
3. General. Procedures described herein are considered appropriate and usable for hydrologic engineering
planning and design studies involving flood damage reduction measures for interior areas. Specifically, the
document is intended to assist with better scoping, planning, and analysis of interior flooding studies using
the HEC-IFH program. Hydrologic engineering requirements for existing and future with and without
conditions analyses are summarized. The minimum facility concept is presented. Technical analysis
procedures for hydrologic analysis using hypothetical events and continuous simulation for various conditions
of coincidence between interior and exterior flooding are described. Emphasis is placed on hydrologic
analyses of gravity outlets, pumping stations, and detention storage. Appendices provide two example
applications.
FOR THE COMMANDER:
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