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U.S. Army Corps of Engineers Admits Fault
On April 5, 2006, months after independent investigators had demonstrated that levee failures were not due to natural forces beyond intended design strength, Lt. Gen. Carl Strock testified before the U. S. Senate Subcommittee on Energy and Water that, "We have now concluded we had problems with the design of the structure." He also testified that the U.S. Army Corps of Engineers did not know of this mechanism of failure prior to August 29, 2005. The claim of ignorance is refuted, however, by the National Science Foundation investigators hired by the Army Corps of Engineers, who point to a 1986 study by the Corps itself that such separations were possible in the I-wall design.[16]
Nearly two months later, June 1, 2006, the USACE finally and unequivocally admitted responsibility for the events in New Orleans with the release of the completed report. The Final Draft of the IPET report states the destructive forces of Katrina were "aided by incomplete protection, lower than authorized structures, and levee sections with erodible materials."