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I-walls levees are the worst option because they do not work. This type of levee relies on the passive pressure of the soil, which is the horizontal pressure of the soil. The passive pressure of the soft soils in the New Orleans area is not very strong. The force of the storm surge is exerted on the top of the wall and the bottom is not supported by the soft soils. Additionally, the height to which an I-wall can be built is limited, and over topping scours out the soil supporting the backside. Seepage is also a major problem when it comes to the I-wall system. The best solution when it comes to levees is the t-wall levee system. Although very expensive it is very strong and would work better than the other two systems. Since the wall is above the force couple, the taller the wall becomes the longer the lever surge forces have to apply pressure to. In order to resist overturning the base must be extremely heavy (4′ to 5′ thick) and H-piles must be extremely deep. In many cases they are driven to a depth of 120′. Because they are driven in at an angle they must be considerably longer than 120′ to reach that depth.While levee systems may help when it comes to flooding there needs to be something in place for when/if they fail. Stilt houses or pile dwellings or palafitte are houses raised on piles
PM3225 UNIT 9 Project Part 38over the surface of the soil or a body of water. Stilt houses are built primarily as a protection against flooding, but also serve to keep out vermin. The shady space under the house can be usedfor work or storage. Stilt houses date to prehistoric times and can be seen in a variety of forms worldwide. New about them are the innovative and diverse ways in which they are being designed and built. Stilt houses are well suited to coastal regions and subtropical climates. They protect against floods, maximize views and allow homeowners to build on rocky, steep or unstable land. They also keep out animals and vermin, provide ventilation under the house and minimize a house’s footprint.Building a new home on stilts might be a good idea if your property lies anywhere withinthe Federal Emergency Management Agency's newly designated flood zones. Some areas of the country already utilize this method for known flood zones. Rising an existing home is a bit more complicated then building from scratch. All utility lines must be disconnected. Steel beams are placed beneath the ground floor, and then the home is slowly lifted with hydraulic jacks and placed incrementally on wooden cribs. The house is then moved aside, a new pylon foundation isset in place and then the house is placed back on its new, higher foundation.