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(9:00 am) August 29, 2005: New Orleans’ 17th Street Canal Levee-Floodwall is Breached

Around 9:00 am this morning, the 17th Street Canal levee-floodwall system is breached. However, according to Al Naomi, Army Corps of Engineers’ New Orleans project manager, the breach occurs in mid- or late-morning after Katrina’s eye has passed east of New Orleans. By that time, north winds have pushed storm surge water in Lake Pontchartrain south against the hurricane levees and into the canals, and then the wind shifts to the west. “As I remember it the worst of the storm had passed when we got word the floodwall had collapsed,” Naomi later says. “It could have been when we were experiencing westerly winds in the aftermath of the storm, which would have been pushing water against it.” Naomi and other Corps officials will later say that they believe that the water in the canal topped the levee on the Orleans Parish side, weakening its structure on the interior side and causing its collapse. Ivor Van Heerden, LSU Hurricane Center expert, however, will say that he does not believe the water was high enough in the lake to top the 14-foot wall and that the pressure caused a “catastrophic structural failure.” [McQuaid, 9/7/2005 Sources: Al Naomi, Ivor Van Heerden]
Note - Reports about when this breach occurs vary. For example, Knight Ridder reports that the breach occurred at 3:00 am this morning, and that the breach was reported to the Army Corps of Engineers around 5:00 am. [Knight Ridder, 9/11/2005] Later today, the Army Corps of Engineers will report that the breach occurred “overnight” and that the Industrial Canal breach occurs at this time. [US Army Corps of Engineers, 8/29/2005 pdf file Sources: US Army Corps of Engineers] The Boston Globe will report that the breach occurs later this afternoon. [Boston Globe, 9/11/2005] The Chicago Tribune will report that the breach does not occur until August 30. [Chicago Tribune, 9/11/2005] However, it appears more likely that the 17th Street Canal floodwall-levee is breached around this time, and that the early morning breach reported is the breach of the floodwall(s) in the Industrial Canal.

Timeline Tags: Hurricane Katrina

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