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Hurricane Isaac Damage Summary

Coastal Protection and Restoration Authority. Hurricane Isaac Damage Summary. Governors Advisory Commission on Coastal Protection October 3, 2012. Coastal Protection and Restoration Authority.

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Hurricane Isaac Damage Summary

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  1. Coastal Protection and Restoration Authority Hurricane Isaac Damage Summary Governors Advisory Commission on Coastal Protection October 3, 2012

  2. Coastal Protection and Restoration Authority • Hurricane Isaac makes first landfall on August 28th at 6:45 p.m. near the Mouth of the Mississippi River. • Isaac makes a second landfall at 2:00 a.m. Wednesday the 29th at Port Fourchonas a Hurricane with 80 MPH winds.

  3. Coastal Protection and Restoration Authority Major Damaged Areas • Braithwaite • Laplace • Lafitte • Old Slidell

  4. Coastal Protection and Restoration Authority Braithwaite- Measured peak surge 13.89 feet at 8:25 a.m. on Wednesday the 29th Overtopped for 24 hours 8.5 ‘ levee height

  5. Coastal Protection and Restoration Authority Complete Inundation from Caernarvon Canal to Whites Ditch. Including Braithwaite, Scarsdale, and Bertrandville. Braithwaite Park Subdivision Concrete tombs washed up on the MRL

  6. Coastal Protection and Restoration Authority Laplace- Measured peak surge 7feet at 4:45 a.m. on Wednesday the 30th.

  7. Coastal Protection and Restoration Authority Heavy rain and high water in Lake Pontchartrain and Maurepas push water into St. John and St. James flooding Laplace. Levees are minimal (+5 at best) or nonexistent Belle Terre Subdivision East St. John High School

  8. Coastal Protection and Restoration Authority Lafitte- Measured high water marks at 5.09’ Upper Lafitte standing water on Barrataria highway Lafitte Town Hall, not inundated but close!

  9. Coastal Protection and Restoration Authority Slidell- Bayou Bonfouca measured Peak Surge 8.28 ft. on the 30th at 1:30 a.m.

  10. Coastal Protection and Restoration Authority Isaac- NHC Hindcast, inundation depths

  11. Coastal Protection and Restoration Authority Summary Most severely flooded areas were overtopped due to extreme storm surge that overtopped deficient levees in height. Surge was somewhat unexpected for a category one hurricane. However, increased surge levels can be attributed to decaying marsh and lack of forested ridges and vanishing barrier islands. There was some evidence of needed pumping capacity to dewater areas in a more efficient manner.

  12. Coastal Protection and Restoration Authority Questions?

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