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Appendix B: Corps-FEMA Levee Certification Documentation
Pages 181-192

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From page 181...
... Appendix B Corps-FEMA Levee Certification Documentation
From page 182...
... Once adopted, the procedures outlined In that document will ~ used ~ the Corpe flood damage reduction studies. This recently completed effort, In =e fom of an Engineering Circular, Nan been trsn~tt" to our dials orifice for Ever See review and comment.
From page 183...
... BE Federal Emergency Management Agency Widgeon, D.C.
From page 184...
... If tic Flu is equal to or ~ teat LO an we do not chit tic love on our maps; if is is Is tow 1.0 ~ arc do credit Sac J='ec on our maps. Iiadid~ly, the term base flood hat; bed syson~= m~ 1~ ~~gc.
From page 185...
... A ~ ICES As - S Adni~s~r Office of Risk Assessment Fug Insurance Adminis=doo E=:10sure cc; Mr. Jerome Pc~n Ch ef, Paw gem Spices "d Cap Rowe ash U.S.
From page 186...
... Army Corps of fleers (USAC~) dated April 23, 1993, conc~g our commcms on your Ant circular en ;dcd Bisk A~lysisFram~orkforEvaluationolHydrology/HydraulicsandEconomicsin Flood Damage Red~ucdon Studies, deceit June 30, [992.
From page 187...
... probability stodgy of 0 01 referenced in our AM 1993 Outer produced levee designs with only 0.1 to 1.5 feet of Aboard Ad conned me FEMA base flood with a reliability of between only 50 and 15 petrc~nt I am concemed that deem may be a "t=hal far constrict between Icvec projects designed by the USACE and by other Feds Agencies and Prime Engineering firms. It is conceivable Mat levee designs (epically levee heidbts)
From page 188...
... Richard W K0m ·A~ Dot Mitigation Di~orate Federal Emergency Management Agency W~n,.DC 20472 Dew Mr.
From page 189...
... Use of nsk-based analyst by Me U.S. Army Corps of Engineers in flood damage reduction project formation shldies has calmed a disconnect between the Corps analysis and the Federal Emergency M=agemcut Agency's (FEMA)
From page 190...
... PURPOSE AND APPI~IC~ILI~I-Y: This dock t provides guidance to be ~ for cer~g levees to the Federal Emergency M~agemem Agency (FEMA) for their admini~abon of the National Flood Insurance Program ~P)
From page 191...
... Risk Based Analysis Available: In these cases, output on project performance from the Risk-Based Analysis should be used to arrive at a decision regarding levee ce~canon for FEMALE Ping and proposed levees will be certified as capable of passing the FEMA base flood if the levees meet the FEMA criteria of 100 year flood elevation plus three feet of Beeboard, wit lo arcephons, as follows. When Me FEMA crania results ~ a "Conditional Percent Chance No~lance" (Reliabilit r)
From page 192...
... NO YES 1 Determine levee devation ninth 95% reliabBi~ of protecting to the 1% chance annual flood event {Jse minmium levee devation per FEMA criteria for certification Use {eves deflation corresponding to 90% ridability for cerdfica~don Use levee elevation corresponding to 95% rdiabBi~ for certification PUMA Cntena - 1% chance median ~n~1 flood event plus three feet of Reboard LIAB~lTY = % chance no~ceedance given the 1% chance annual event occurs (Page 3 of 3)


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