Advantages
ü 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.
ü There
is no pressure from floodwater to cause structural damage to the building.
ü These
barriers are usually less expensive than elevating or relocating the structure.
ü Occupants
do not have to leave the structure during construction.
Disadvantages
ü This
technique cannot be used to bring a substantially damaged or improved structure
into compliance with floodplain development standards.
ü May
violate floodplain development standards, particularly in floodway locations,
by causing obstructed flow or in increased flood heights.
ü Failure
or overtopping of a levee or floodwall results in as much damage as if there
was no protection (or more).
ü May
restrict access to the structure. If human intervention is required for
closures, there must be adequate warning time.
ü May
be expensive.
ü For
buildings with basements, hydrostatic pressure from groundwater may still cause
damage.
ü Local
drainage can be affected, possibly creating water problems for others.
ü Interior
drainage must be provided.
ü Levees
require considerable land area.
ü Require
periodic maintenance.
ü No
reduction in flood insurance premiums.
ü Do not eliminate the need to evacuate during floods.
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