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Levees and flood walls
Levees and flood walls one of oldest and most widely used methods of protecting
land from floodwater. These are essentially longitudinal dams constructed along the river
banks roughly parallel to the direction of flow of the river. These serve as artificial high
banks of the river and thus prevent flood water from spilling over to the adjoining land.
Levees
A levee is a earth dyke or embankment. Levees are most frequently used for
flood control because they can build at relatively low or cost material
available at the site.
Levee cross section must be adjusted to fit the site and the available
materials.
Location of Levees
Levee should located on both the banks such the sufficient area flow is
provided between them to transmit the design flow with reasonable free
board against wave action.
It is often cheaper to place the levees along the high ground. Futher in any
case, full advantage should be taken of ridges, which permit lower levees and
often provide better conditions.
Flood Wall
A levee is a earth embankment while flood wall is usually of masonary or concrete .
It is used to develop an area where it is difficult to obtain enough land for
construction of levees.
It is sort of gravity dam constructed along the river proper foundations should
provided and all precautions should be taken against scouring .
Advantages and Disadvantages of Levees and Floodwalls
Advantages
■Levees and floodwalls can protect a building and the surrounding area from inundation
without significant changes to the structure if the design flood level is not exceeded.
■There is no pressure from floodwater to cause structural damage to the building.
■These barriers are usually less expensive than elevating or relocating the structure
■Occupants do not have to leave the structure during construction.
Disadvantages
■ May violate floodplain development standards, particularly in floodway locations, by
causing obstructed flow or in increased flood heights.
■ Failure or overtopping of a levee or floodwall results in as much damage as if there was
no protection (or more)
■ May restrict access to the structure. If human intervention is required for closures, there
must be adequate warning time.
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■ May be expensive.
■ Local drainage can be affected, possibly creating water problems for others.■ Interior
drainage must be provided.
■ Require periodic maintenance
■ No reduction in flood insurance premiums.
■ Do not eliminate the need to evacuate during floods.

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Levees and flood walls Levees and flood walls one of oldest and most widely used methods of protecting land from floodwater. These are essentially longitudinal dams constructed along the river banks roughly parallel to the direction of flow of the river. These serve as artificial high banks of the river and thus prevent flood water from spilling over to the adjoining land. • • • • Levees A levee is a earth dyke or embankment. Levees are most frequently used for flood control because they can build at relatively low or cost material available at the site. Levee cross section must be adjusted to fit the site and the available materials. Location of Levees Levee should located on both the banks such the sufficient area flow is provided between them to transmit the design flow with reasonable free board against wave action. It is often cheaper to place the levees along the high ground. Futher in any case, full advantage should be taken of ridges, which permit lower levees and often provide better conditions. Flood Wall • • • A levee is a earth embankment while flood wall is usually of masonary or concrete . It is used to develop an area where it is difficult to obtain enough land for construction of levees. It is sort of gravity dam constructed along the river proper foundations should provided and all precautions should be taken against scouring . Advantages and Disadvantages of Levees and Floodwalls Advantages ■Levees and floodwalls can protect a building and the surrounding area from inundation without significant changes to the structure if the design flood level is not exceeded. ■There is no pressure from floodwater to cause structural damage to the building. ■These barriers are usually less expensive than elevating or relocating the structure ■Occupants do not have to leave the structure during construction. Disadvantages ■ May violate floodplain development standards, particularly in floodway locations, by causing obstructed flow or in increased flood heights. ■ Failure or overtopping of a levee or floodwall results in as much damage as if there was no protection (or more) ■ May restrict access to the structure. If human intervention is required for closures, there must be adequate warning time. ■ May be expensive. ■ Local drainage can be affected, possibly creating water problems for others.■ Interior drainage must be provided. ■ Require periodic maintenance ■ No reduction in flood insurance premiums. ■ Do not eliminate the need to evacuate during floods. Name: Description: ...
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