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Eugene -Springfield Area Natural Hazards Mitigation Plan <br />2. Hazard Descriptions <br />2.7.4 Impacts — Cascading Incidents <br />Civil Unrest <br />Civil unrest is not a known significant impact of a landslide. <br />Dam or Levee Failure <br />As discussed in section 2.3.4, landslides do have the potential to cause dam failure <br />due to overtopping. This is more likely to occur when the reservoir behind the dam <br />is at full capacity. The Army Corp of Engineers takes this into account during <br />design and operations, so failure due to this impact is very low. <br />More information on dams and levees is in Appendix H. <br />History of Impact in Eugene -Springfield <br />Landslide induced dam or levee failure has not occurred in the Eugene or <br />Springfield area Additionally, such incidents are extremely rare. Out of the 90 <br />dam failures reviewed, between 1802 and 2015, only one was due to a landslide. <br />The Vajont Dam (Italy) was overtopped by a wave produced by a massive landslide <br />in 1963. This incident destroyed five villages, killing 2,000 people. Poor <br />construction and operation were thought to have worsened the impact to the dam.62 <br />Risk of Impact <br />Based on historical occurrences, the condition of local dams and levees, and the <br />probability of a significant landslide into a large body of water contained by such <br />structures, the risk from this impact has been determined to be low. <br />Epidemics <br />Though the odds of landslide induced epidemics is unknown, a landslide could <br />cause this impact. Search and rescuers may be exposed to contaminated biological <br />waste. Additionally, a slide may contaminate water supplies, though this should be <br />detected relatively quickly thus limiting transmission. <br />History of Impact in Eugene -Springfield <br />There has been no landslide -induced epidemics in the Eugene -Springfield area. <br />Risk of Impact <br />e2 Bressan, David. "Expecting A Disaster: The 1963 Landslide of the Vajont Dam." Forbes. October <br />10, 2017. Accessed November 30, 2017. <br />https://www.forbes.com/sites/davidbressan/2017/10/09/expecting-a-disaster-the-1963-landslide-of- <br />the-vaj ont-dam/#34fc306f11 N <br />2-48 January 2020 <br />