The Mind-Blowing Flaw That Flooded New Orleans

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Water entering soil pores pushes grains apart, weakening their interlocking strength and making shear failure more likely.
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New Orleans’s three most consequential flood-defense breaches occurred while surge remained below the floodwalls’ design capacity.
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At the 17th Street Canal, water sat several feet below the wall’s top when a 450-foot section shifted open.
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The 17th Street Canal levee failed when foundation soil sheared along a weak plane beneath unexpectedly low water.
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An I-Wall could bow outward, opening a water-filled foundation gap that shortened the soil-shear path to failure.
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At the Industrial Canal, subsidence and confused elevation benchmarks left the wall too low, allowing overtopping to erode soil.
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New Orleans’s levee system turns the city into a bowl: it keeps floodwater out but traps rainwater inside, requiring pumps.
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About 50 levee and floodwall breaches occurred, but three caused most flooding and nearly half the fatalities and economic damage.
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Katrina’s storm surge reached nearly 28 feet, the highest recorded in United States history.
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After Hurricane Betsy flooded more than 150,000 houses in 1965, the federal government invested heavily in New Orleans’s hurricane protection.
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Three outfall-canal failures struck in quick succession on the morning of August 29, shortly after Katrina made landfall.
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Representative levee design sections should come from the weakest soil conditions. If they survive, stronger ground should too.
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New Orleans’s Katrina catastrophe was not simply a natural disaster. Critical flood defenses failed below their designed protection level.
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To understand engineering’s evolution, study disasters that triggered major changes and arrange them into an accessible sequence.

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