Via nola.com: Storm surge from Ida could overtop some West Bank levees; officials say they will hold. Excerpt:
Hurricane Ida could bring up to 15 feet of storm surge to parts of the west bank of Jefferson Parish, threatening to push water over the tops of the levees that shield those areas.
If that National Hurricane Center forecast proves true, it would be the first time the levees have been overtopped since the post-Hurricane Katrina upgrades to the system that surrounds much of the metro area.
But officials said while some localized flooding is possible and urged residents to take precautions, they also stressed that the new barriers are designed for exactly this scenario and are expected to be able to withstand the onslaught.
Sixteen years ago on Sunday, Katrina swept ashore carrying a deadly storm surge that toppled parts of the New Orleans-area levee system. But the $14.5 billion collection of levees, floodwalls, pumps and gates that has replaced it and now rings parts of New Orleans, Jefferson and St. Bernard parishes represents a radical improvement over the area's previous protections.
While critics and some government officials have called for higher and more substantial barriers than have been built in recent years, officials with the U.S. Army Corps of Engineers, levee authorities and local governments said that the levee system is capable of handling the expected surge that the New Orleans area will see from Ida.
“This is a very differently protected city than it was 16 years ago” said Ramsey Green, New Orleans Mayor LaToya Cantrell’s deputy chief administrative officer for infrastructure.
Built into the new system is the idea that the levees would reduce the risk of a storm surge – not provide an impossible-to-guarantee level of unlimited protection – and that even when overmatched with high water, the system's levees would still be left standing.
“People need to know if they’re in an area that could get this surge, they need to be prepared, they need to understand that this is exactly what this system was designed to do,” said Ricky Boyett, a spokesperson for the U.S. Army Corps of Engineers in New Orleans.
The levees' height is aimed at blocking overtopping from water levels that have a 1 percent chance of occurring in any year, a so-called 100-year event. Worst-case surge created by a Category 4 hurricane striking the area around New Orleans would be greater than such an event.
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