e.
Landsliding. If a significant landslide risk to
a facility exists, it is generally difficult to design the
structure or its foundation to withstand the landslide
movement. Mitigating measures typically involve
some form of slope stabilization, such as regrading,
buttressing, subsurface drainage, or ground
modification. If a hazard exists to a structure from
rockfalls or shallow soil flows on a slope above the
structure, mitigating measures include removal of the
material susceptible to failure, buttressing or other
stabilization to prevent failure, or creating walls or
earth berms to catch or deflect falling rocks or soil
flows.
f.
associated with flooding is not too great, the hazard can
be mitigated by creating walls or breakwaters to
prevent the water from reaching the structure or
dissipating its energy. For floodwaters substantially
above the facility elevation or moving with great
velocity, resiting may be the only feasible alternative to
mitigate the hazard.
F-6.
Documentation of Geologic Hazards
Evaluations
The methods employed for evaluating geologic
hazards, the results of the evaluations, and the
conclusions should be documented in a report prepared
by the geotechnical professional.
F-43
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