The Pros and Cons of Levees
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My Scoop on the Pros and Cons of Levees

There are many types of levees used around the world. They include I-Wall, T-Wall, Earthen, Double- Wall, and Clay levees.Levees are used to protect civilizations from natural water disasters such as hurricanes and tidal waves.The type of levees differentiate on size, cost, and efficiency.

 

The matter of cost and size go hand in hand. The bigger the levee has to be, the more it is going to cost to build. The most expensive levee to build is the T-Wall, this type of levee costs around 14-19 thousand dollars per linear foot. Sometimes there isn't enough funding to even finish the levee and there are places unprotected. T-Walls have to be very deep, which is a part of why this type is so expensive. But a good thing about the T-Wall is that it is not very wide since it is so deep. The least costly to build are the Clay leeves. Clay leeves cost 4-8 thousand dollars per linear foot. But these levees have to be built very wide and sometimes the clay has to be brought in increasing the cost. So the wider the levee is, the cost is less, while the levees that take up less space are more expensive to build and to maintain also.

 

Efficiency is a big deal when talking about levees because they are what help protect people in the case of hurricanes. The most efficient levees are the T-Wall, Earthen, and Double-Wall. They might not all be cost efficient but when faced with an actual hurricane or tidal wave they are better at keeping the water out and protecting people. I-Wall levees are the worst levees for eficiency. They rely on the soil to hold them in place and sometimes the pressure of the levee is too much for the soil and the levee is not supported and when hit with a hurricane or tidal wave will fail to block water.

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Image: Aftermath of Hurricane Katrina

Image: Aftermath of Hurricane Katrina | The Pros and Cons of Levees | Scoop.it

New Orleans after the levees broke during hurricane Katrina.

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Graph: Cost of Levees

Graph: Cost of Levees | The Pros and Cons of Levees | Scoop.it

This graph show the different varying costs of Clay levees, Double-Wall levees, and T-Wall levees. As you can see clay is the least in cost at $4-8k per linear foot, while T-Walls are the most expensive of the three at $14-19k per linear foot.

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Current Levee Solutions - Strong Levees

Current Levee Solutions - Strong Levees | The Pros and Cons of Levees | Scoop.it

In this article the author points out the pros and cons in each type of levee. The types of levee the author discusses are Earthen, I-Wall, and T-Wall levees. Each levee varies by the cost, strenght of the structure, and size. Earthen levees are tall, wide, and compact. But using this earthen  technique is expensive because of all of the clay needed. I-Wall levees are no very stable and rely on a soils passive pressure, seepage is also a huge problem for this levee. T-Wall leeves are strong and effective, but are very expensive costing millions of dollars per mile. And since the T-Wall levees are so expensive sometimes the walls cant be finished due to lack of money.

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Lsua Center PDF File

http://www.lsuagcenter.com/NR/rdonlyres/6416D27D-7057-4CF6-8CE2-823F657B0188/26062/pub2744Levees8.pdf

 

Levees can cost a lot and require a lot of maintence and knowledge.  The must meet certain requirements and you may have to have a permit.  A levee protects from the dangers of floods but it also can cause problems for neighbors and send even more floodwaters towards their house depending on how it's built.  Even with a levee rain can seep through and you will need a pump as well.  Though a levees helps with the problem of flooding you still have to be prepared and have a plan of how to get to saftey if the levee fails.

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Image: Levee in the Ninth Ward

Image: Levee in the Ninth Ward | The Pros and Cons of Levees | Scoop.it

This levee is found in the Ninth Ward in New Orleans, it had to be repaired after hurricane Katrina. The levee is an T-Wall levee.

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Levee breaks devastate New Orleans - The New York Times

In 2005 New Orleans, Louisiana faced a devastating storm, hurricane Katrina. Many people evacuated before the storm came but many stayed in the city.  After they thought they had escaped the worst of the storm, 2 levees were breached and failed.  All the water being held back by the levees flowed into the city and many people were trapped and died.  The surrounding areas were flooded with people who had escaped the city and now had no where to live.  The Red Cross and the National Guard came in to help and they created shelters and rescue centers.

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