Gennaro Bifulco Stephanie Camilo Rickie Caudill Sam Henry Diane - - PowerPoint PPT Presentation

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Dec 11, 2022 111 likes •232 views

Gennaro Bifulco Stephanie Camilo Rickie Caudill Sam Henry Diane Wurst What is a Levee? An embankment to prevent the overflow of a river Analogy Dams are for lakes Levees are for Rivers History Levees first built in New

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Gennaro Bifulco Stephanie Camilo Rickie Caudill Sam Henry Diane Wurst

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What is a Levee?

An embankment to prevent the overflow of a river

Analogy

 Dams are for lakes  Levees are for Rivers

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History

Levees first built in New Orleans in the late 1800’s Built up and down the Mississippi River, as well as along

the Gulf of Mexico and Lake Ponchartrain

New Orleans was utilizing 350 miles of levees Government decided the levees had to be able to handle a

Category 3 Hurricane

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Causes of Failure

 Settling was not considered in Hurricane Design for the canal and weren’t considered until 50 years thereafter  Design for Category 3 Hurricane Pre existing Depression  19-25mm Layer of organic silty clay Pumping of Groundwater Caused Drying of Swamp/Marsh Layer Lack of funding for maintenance

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Geology of the 17th Street Canal Levee

Layers of soil product of: Nearby Lakes & Rivers: Lake Pontchartrain & Maurepas, and Mississippi River Marsh/Swamp Deposits=High Organics & Very Low Strength

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Aftermath of Levee Failure

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Solutions

Levees are now being:

Reinforcement Raised Stability improved Seepage control

The New Orleans Levee

Project won't be finished until June 1, 2011, at the earliest.

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Conclusions

The failure at 17th Street was due to various geological

conditions:

Dried out organic swamp soils with low strength Sensitive clay layer getting exposed to water during

Hurricane Katrina

With more studies of geotechnical engineering then

New Orleans can be improved to be more hurricane resistant

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Questions?

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References



http://www.cnn.com/2005/WEATHER/08/28/hurricane.katrina/

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http://news.nationalgeographic.com/news/2005/09/0902_050902_katrina_levees.html

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Tibbetts, J. (2006, January). Louisiana’s Wetlands: A Lesson in Nature Appreciation. Environmental Health Perspectives, 114(1). Retrieved January 24, 2010, from EBSCOhost database.

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Seed, R.B., Bea, R. G., et al. (2008, May). “New Orleans and Hurricane Katrina: The 17th Street Drainage Canal.” Journal of Geotechnical and Geoenvironmental Engineering. Retrieved January 24, 2010.