Introduction
Problem:
Damage
to
miscellaneous
facilities,
such as
fences and
buoyant
fixtures
are
commonly
caused by
floodwater
inundation.
In
addition
to
saturation
damage,
the
facility
can be
damaged or
destroyed
by debris
that is
carried
through
the
floodwaters.
Mitigation
Objective:
To
protect
miscellaneous
facilities
from
damage due
to
floodwater
inundation.
A.1
Strengthen
Fencing
Strengthen
fences
damaged by
low to
moderate
velocity
flows by:
1) Using
heavier
gauge
materials;
2) Adding
back
bracing to
the line
posts;
and/or 3)
Installing
intermediate
line
posts.
Effectiveness:
- Fence
strengthening
is
generally
effective
in
areas
that
are
flooded
by
low
velocity
flows
with
minimal
debris
loading.
- Additional
measures,
such
as
providing
sacrificial
fence
sections
to
allow
floodwaters
to
pass,
may
be
required
to
increase
the
effectiveness
during
times
of
moderate
flow.
Limitations:
- Fence
strengthening
has
limited
effectiveness
in
areas
of
moderate
to
heavy
velocity
and
debris
loading.
- Fence
strengthening
could,
in
some
extreme
cases,
cause
a
damming
effect,
raising
upstream
water
levels.
Considerations:
A.2
Anchor
&
Tie-Down
Buoyant
Facilities
Provide
anchors
and
tie-downs
for fuel
tanks and
other
buoyant
facilities,
such as
mobile
offices,
storage
buildings,
and
playground
equipment
to keep
them from
being
washed
away
during
flood
events.
Effectiveness:
Anchors
and
tie-downs
are very
effective
in keeping
small,
buoyant
facilities
from being
washed
away.
- Also
prevents
object
from
becoming
a
debris
projectile
or
a
source
of
contamination.
Limitations:
- May
not
be
effective
in
areas
of
moderate
to
high
velocity
flows
with
moderate
to
heavy
debris
loading.
In
these
instances,
relocation,
elevation,
or
other
mitigation
alternatives
should
be
considered.
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