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Table A -6: Natural Hazards Potential Impact Data for Cabarrus County Natural Hazard Range Cabarrus Coun Potential Impacts Hazard Index combined rankin Earthquake Vulnerability Low =1 to High = 6 3 Landslide Vulnerability Low =1 to High = 6 3 Frequency of All Hurricanes, 1900 -2009 Saffir -Sim son Class 1 -5 0 Frequency of Minor Hurricanes, 1900 -2009 Saffir -Sim son Class 1 -2 0 Frequency of Major Hurricanes, 1900 -2009 Saffir -Sim son Class 3 -5 0 Nor'easter Vulnerability 1 = some direct vulnerability 0 Frequency of Tornadoes, 1953 -2009 Number of tornadoes 11 Extreme I -day snowfall In inches 9 Drought Low = 1, Mod. =2, High = 3 1 Wildfires, 1950 -2009 Low = 1, Mod. =2, High = 3 1 Number of Acres Burned, 1950 -2009 Low = 1, Mod. =2, High = 3 1 Soil Subsidence Low = 1, Mod. =2, High = 3 1 Source: Local Hazard Mitigation Planning Manual, NCDEM, 1998, p. 86. E. Hazard Index for Cabarrus County. Certain parts of the County, such as floodplains and steep river or creek banks, are more prone to hazards. In addition, certain types of hazards are likely to produce only localized effects while others have wide spread effects. Some natural hazards have extraordinary impacts but occur infrequently. Other hazards occur annually or several times a decade, but cause less damage. The total potential impact of each type of hazard can be projected using a combination of likely strength of the event, the size of the area(s) affected, and the density of human activity within the likely path of the hazard. Table A -7 gives each natural hazard a "hazard index" rating based on a combination of three factors — probability of occurrence, size of potential area affected, and the potential impact of the event. Assigned risk levels were based on historical and anecdotal data as well as input from planning committee members. Table A -7: Hazard Index for Cabarrus County Hazard Type Probability of Occurrence Potential Area Affected Potential Impacts Hazard Index combined rankin Thunderstorm Highly Likely Medium Negligible 1 Severe Winter Storm Likely Large Limited 2 Tornado Possible Small Limited 3 Flood Likely Small Limited 4 Hurricane Likely Large Limited 5 Wildfire Likely Small Negligible 6 Drought Possible Large Negligible 7 Earthquake Unlikely Large Negligible 8 Landslide Unlikely Small Negligible 9 Soil Subsidence Unlikely Small Negligible - Nor'easter Unlikely I - Source: Keeping Natural Hazards from Becoming Natural Disasters, NCDEM, 1998, pp. 10 -12. Annex A Hazard Identification and Analysis A -11 1 DeCW*1 ne2,0hkber 5 F -6 Page 115