Acknowledgements: This study was conducted for the Federal Insurance Administration of the U.S. Department of Housing and Urban Development. Cooperation and significant contributions of information, suggestions, and reviews were received from the following agencies and individuals: Each of the 50 States. Federal Insurance Administrations, Tennessee Valley Authority, U.S. Army Corps of Engineers, Bob Buehler (Consulting Engineer), Jerome Degen (Anderson-Nichols & Co.), William G. DeGroot (Urban Drainage & Flood Control Dist.), L. Douglas James (Utah Water Research Laboratory), Edward J. Kennedy (U.S. Geological Survey), John R. Sheaffer (Sheaffer & Roland, Inc.), L. Scott Tucker (Urban Drainage & Flood Control Dist.), Kenneth R. Wright (Wright-McLaughlin Engineers)

Acknowledgements -- Summary -- Introduction -- Origin of Criterion -- Criterion of Federal and Profession Guides -- Tennessee Valley Authority -- American Society of Civil Engineers -- Executive Order 11296 -- Federal Insurance Administration -- Executive Order 11988 -- Criterion of State and Local Programs -- States Using "no more than one foot" -- States Using a More Stringent Criterion -- Effects of Fringe Development on Elevations -- Need for Data Regarding Slow-Blockage -- Corps of Engineers data -- Tennessee Valley Authority data -- Other related data -- Findings