Introduction
Problem:
Consolidation
and
settlement
of soils
that
damage a
utility
facility
during a
flood
event.
Mitigation
Objective:
Protect
the
utility
from soil
settlement,
including
slides,
from
future
damage
B.1
Line
Damaged
Pipes
Provide
a lining
inside
damaged
storm and
sanitary
sewer
lines to
prevent
infiltration
and/or
exfiltration
and
associated
erosion
and
settlement.
Lining
will also
prevent
increased
flows due
to
infiltration
of
excessive
groundwater
that could
overwhelm
treatment
plants or
other
facilities
during
periods of
wet
weather.
Several
lining
techniques
are
available.
The most
common
techniques
are slip
lining and
inversion
lining.
Effectiveness:
- Very
effective
- Will
prevent
infiltration/exfiltration
of
floodwaters.
Limitations:
- Lining
may
not
be
useful
if
system
components
are
too
far
out
of
alignment.
- May
not
be
feasible
for
small
diameter
pipes.
Considerations:
B.2
Bury the
Utility
Place
above
ground
utilities,
such as
transmission
and
distribution
lines for
electricity
and
communication
lines,
underground
to avoid
damage
from
floodwaters,
debris,
and from
soil
settlement.
Effectiveness:
Limitations:
- Maintenance
access
may
be
restricted.
- Buried
utility
lines
could
be
vulnerable
to
earthquakes,
slides,
or
other
earth
movement
events.
Considerations:
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