Cover image: AI-generated conceptual illustration. Not a historical photograph or accurate reconstruction of New Orleans in 2005.
Explore the evidence behind Katrina’s storm surge and flood protection failures.
Hurricane Katrina is often remembered through aerial photographs of flooded New Orleans and helicopters searching above rooftops. Those images record the aftermath of a regional catastrophe. Understanding them requires looking at the storm, the protection system, evacuation, and emergency response together.
Watch the documentary above, then explore the evidence behind the storm surge, floodwall failures and rescue effort in the sections below.
Why the wind category was not the whole story
Katrina reached Category Five intensity over the Gulf of Mexico on August 28, 2005. It made landfall near Buras, Louisiana, on August 29 as a Category Three hurricane, then reached the Louisiana–Mississippi border region. A lower wind category at landfall did not remove the storm-surge danger. Storm size, coastal geography, water depth, and the storm's movement also influence coastal flooding.
The National Hurricane Center's historical account is the source for this chronology. The documentary avoids presenting an early operational estimate as the final storm assessment.
How New Orleans flooded
New Orleans depended on interconnected levees, floodwalls, drainage canals, and pumps. Katrina caused breaches and overtopping in multiple places. Engineering investigations distinguish these mechanisms: water flowing over a barrier can erode its landward side, while foundation instability can cause failure before the wall is overtopped.
The Army Corps of Engineers documents that important failures at the Seventeenth Street and London Avenue canals occurred before overtopping. The film uses original, labeled schematic animations to explain the distinction. They are conceptual illustrations, not exact reconstructions of a measured breach.
Evacuation required more than a warning
Many residents left before landfall. Others faced barriers involving transport, disability, health, finances, or a place to stay. Government Accountability Office reviews examined planning for people who could not independently evacuate. Effective plans need clear responsibility and practical transport arrangements, alongside public instructions.
Rescue and the longer aftermath
Archival rescue and evacuation photographs show specific moments in late August and early September 2005. Keeping the date of each image visible prevents the aftermath from being confused with the instant of landfall. The film does not infer survivors' identities, destinations, or private experiences from an image.
Rescue did not end displacement. Recovery involved housing, healthcare, damaged infrastructure, and decisions about returning. A repaired building and a restored household are different measures of recovery.
Lessons grounded in evidence
Katrina illustrates why hurricane risk cannot be reduced to a wind category; why foundations and drainage belong in evaluations of flood protection; why evacuation plans must account for people needing assistance; and why response must connect information, authority, transport, and delivery.
Sources
- National Hurricane Center, Hurricanes in History: https://www.nhc.noaa.gov/outreach/history/
- National Hurricane Center, Katrina Tropical Cyclone Report: https://www.nhc.noaa.gov/data/tcr/AL122005_Katrina.pdf
- USACE, levees and floodwalls: https://www.mvn.usace.army.mil/Missions/HSDRRS/Risk-Reduction-Plan/Levees-Floodwalls-Armoring/
- USACE, London Avenue Canal investigation: https://www.mvn.usace.army.mil/portals/56/docs/hsdrrs/MOWL-London-Ave-Canal.pdf
- GAO, transportation-disadvantaged evacuation planning: https://www.gao.gov/products/gao-07-44
- GAO, preparedness, response, and recovery: https://www.gao.gov/products/gao-06-442t
- GAO, Coast Guard Katrina response: https://www.gao.gov/assets/a251021.html
Media credits
Historical photographs in the accompanying documentary are credited to their original U.S. agencies. Maps and diagrams are illustrative and not measured engineering reconstructions. The cover image is an AI-generated editorial illustration, not archival footage of Katrina.
Watch the 55-second companion Short: Why Katrina’s Wind Category Was Not the Whole Story.
