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Transportation Routes
Transportation routes can also be impacted by many of the hazards discussed in this plan. The
primary hazards that impact transportation are: Flood, Hazardous Materials, and Winter
Weather. Flood events, both riverine and flash flood can make roads and bridges impassible
due to high water. Flood waters can also erode or scour road beds and bridge abutments.
Highway and railroad accidents that involve hazardous materials can impact transportation
routes as road and railroad closures, as well as evacuations may be necessary. Winter
Weather frequently impacts transportation as roads become treacherous or impassible due to
ice and snow. Secondary hazards that impact transportation routes include: dam and levee
failure if routes are in inundation areas, extreme temperatures can cause damage to pavement
(especially asphalt), land subsidence can damage roads/railroads if subsidence area is near the
route, landslide can cause debris and rock falls onto roadways, terrorism can target routes,
tornado can directly damage infrastructure or deposit debris in routes, wildfire can cause
decreased visibility on transportation routes due to smoke, and windstorm can cause vehicle
accidents or overturning (particularly cargo vans).
Natural Gas and Oil Pipelines
Primary hazards that can impact natural gas and oil pipelines are earthquake, expansive soils,
land subsidence, landslide, and terrorism.
Water and Sewer Systems
The primary hazards that can impact water supply systems are: drought, flood, hazardous
materials, and terrorism. The primary hazard that impacts sewer systems is flood.
Storage Networks
If damaged, storage networks and infrastructure can disrupt government and business
functions. All state government and most local governments and businesses utilize redundant
systems to decrease vulnerability to outages. All hazards that can disrupt electric power can
also impact storage networks as electricity is required to power the infrastructure. In addition,
the networks themselves can be damaged if the hazard impacts the facility where the network is
located. The primary hazards that can cause direct damage are: flood, lightning, terrorism, and
tornado.
Internet/Telecommunications
Internet and telecommunications infrastructure can be impacted by a number of hazards as
well. The types of hazards and impacts to internet and telecommunications infrastructure are
very similar to electric power supply. Land line phone lines often utilize the same poles as
electric lines. So, when weather events such as windstorm or winter weather cause lines to
break, both electricity and telephone services experience outages. With the increasing
utilization of cellular phones, hazard events such as tornado that can damage cellular repeaters
can cause outages. In addition, during any hazard event, internet and telecommunications
systems can become overwhelmed due to the surge in call/usage volume.
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