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