Handout8 - Levee Failure Mechanisms By Reed L. Mosher,...

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l Levee Failure Mechanisms By Reed L. Mosher, Ph.D., and J. Michael Duncan, Ph.D., P.E., Hon.M.ASCE } FLOOD SIDE PROTECTED SIDE '\'>J':?>~ COMPACTED MATERIAL Z-TYPE STEEL SHEET PILING I-Wall FLOOD SIDE PROTECTED SIDE Z-TYPE STEEL tlJ ,";1 SHEET PILING H-TYPE STEEL if PILING T-Wall FLOOD SIDE \J =... ?~ 111'. A~ 1V:20H '\". ·3, N·. UNCOMPACTED MATER' COMPACTED MATERIAL PROTECTED SIDE 1V:20H UNCOMPACTEO MATEiiiAi:-!t." Figure 1. Flood protection structures in the New Orleans area. O n Monday, August 29, 2005, Hurricane Katrina struck the U.S. Gulf Coast and the New Orleans area during the early morning hours. The storm produced a massive surge of water on the coastal regions. The surge overtopped and eroded away levees and flood- walls along the lower Mississippi River in Plaquemines Parish, along the eastern side of St. Bernard Parish, along the eastern side of New Orleans East, and in locations along the Gulf Intracoastal Waterway and the Inner Harbor Navigation Canal. Although much of the hurricane protection system was overwhelmed by Hurricane Katrina with overtopped levees and flood walls in the New Orleans area, the damage due to flooding would have been one-third less if none of the levees or floodwalls had failed and breached. In all, about 50 breaches of hurricane protection levees occurred due to overtopping and erosion, or due to foundation failures. Approximately two-thirds of the flood damage was due to breaches that increased the volume and depth of flooding, and made dewatering of the flooded areas more difficu It. The Investigation In response to Hurricane Katrina and issues associated with the performance of the New Orleans area hurricane protection system, the Chief of Engineers, U.S. Army Corps of Engineers, established the Interagency Performance Eval- uation Task Force (IPET) on October 10, 2005, to provide credible and objective scientific and engineering answers to fundamental questions about the performance of the hurricane protection and flood damage reduction system in the New Orleans metropolitan area. The key objective of IPET is to understand the behavior of the New Orleans Hur- ricane Protection System to Hurricane Katrina and assist in the application of that knowledge to the reconstruction of a more resilient and capable system for the future. In all, the IPET team included about 150 engineers and scientists covering a wide range ofspecialties from meteorology to social science. The team investigating the performance ofthe levees and floodwalls included about 30 geologists and geo- technical engineers from government, industry and academia. The authors ofthis article were the co-leaders ofthis team. The draft final IPET report, nperformance Evaluation of the New Orleans and Southeast Louisiana Hurricane Protec- tion System," is available on the I PET web site, https:/IIPET.
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This note was uploaded on 09/23/2011 for the course CIVIL ENGI CE 3400 taught by Professor Rosenblad during the Spring '11 term at Missouri (Mizzou).

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Handout8 - Levee Failure Mechanisms By Reed L. Mosher,...

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