Apes Awesome Levees
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Apes Awesome Levees
Pros and Cons of Levees
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My Scoop on the Pros and Cons of Levees

     Levees can either be natural or man made. Man made levees are embarkments that are built to keep water in. They are built by rivers to keep them from overflowing there banks.. They are made from less impermeable soils such as clay and are narrow at the top but wider at the base. They can range in height because there is no set height on how tall they can be. 

     There are many advantages to levees. They allow people to live by rivers or oceans without the fear of flooding, unless the levee breaks. They also provide protection. In the Netherlands, the advantage to using a levee is that it has stopped the ocean waters from flowing onto the land. This has allowed the land to be occupied by people. Levees also keep lakes at bay and rivers from overflowing there banks. 

     Levees comes with many disadvantages. While providing protection from flooding in one place levees can divert the water elsewhere causing flooding in another place.Crops can drown and be killed in the flood causing problems for farmers. Levees can also fail. They can fail by overtopping, underflow, slumping, or erosion. Overtopping is when the water rises above the levee. Underflow is when water permeates the sand deposits underneath the levee and water rises up on the other side. When the weight of the water is too heavy for the levee, it can push over the sides. This is called slumping. Erosion is when the sides and top of the levee slowly start to wear down due to the waves of the water. 

 

 

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Levee Failure

Levee Failure | Apes Awesome Levees | Scoop.it

This graphic shows that levee failure can happen multiple ways through overtopping, underflow, slumping, or erosion

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Floodsmart | Levees | Reduce Flood Risk | Flood Insurance | Family Disaster Plan

Floodsmart | Levees | Reduce Flood Risk | Flood Insurance | Family Disaster Plan | Apes Awesome Levees | Scoop.it

This picture shows a man-made levee along a river to prevent flooding.

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Floods inquiry hears the pros and cons of levees

Floods inquiry hears the pros and cons of levees | Apes Awesome Levees | Scoop.it

Queensland's floods inquiry is being asked to make recommendatons on an issue that pitted farmer against farmer as the disaster unfolded last summer.

This article states many pros and cons of levees but focuses mainly on the cons. One pro is that they provide protection against floods but this leads to diverting the water and causes deeper flooding elsewhere. The article also says that levees are a problem along the Condamine, Balonne, and border rivers in the south because they can lead to the drowning of crops.

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HowStuffWorks "What is a levee?"

HowStuffWorks "What is a levee?" | Apes Awesome Levees | Scoop.it
A levee is a critical safety feature for low-lying areas, such as New Orleans. When a levee breaks, surrounding land faces massive destruction.

This article describes what a levee is and what it does. A levee is a man made embankment that is used to keep a river from overflowing its banks. They are made of less permeable soil, such as clay, and are thicker at the base and thinner at the top and can range in heights. The article gives an example of how in New Orleans, a levee protects the city from the Mississippi river and on the other side of the city, a levee helps to keep Lake Pontchartain at bay. 

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Louisiana to See Biggest Levee-Busting Operation in North America

Louisiana to See Biggest Levee-Busting Operation in North America | Apes Awesome Levees | Scoop.it

This image shows the largest levee busting operation in Louisiana.

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Current Levee Solutions - Strong Levees

Current Levee Solutions - Strong Levees | Apes Awesome Levees | Scoop.it

In this article, different types of levees are explained along with the pros and cons of each. The three types of levees are earthen levees, I-Wall levees, and T-Wall levees. A pro of earthen levees is that they are good at channeling and holding back water but the con is that the factor of safety is reduced. An I-Wall levee has far more cons than pros. The cons are that they rely on the passive pressure of the soil, the height to which it can be built is limited, and seepage is a major problem. The pros of T-Wall levees are that they are very strong and will do their job. The cons are that they are very expensive, not cost effective, and are difficult to repair during emergency situations.    

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