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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br />Table 4-135. Volcanic Activity Expected Annual Loss (FEMA National Risk lndex) <br />4.6.8,8, Volcanic Activity Rtsk lndex Score <br />The volcanic activity Risk lndex score and rating represent a community's relative risk for volcanic activity <br />when compared to the rest of the United States. Table 4-136 illustrates the volcanic activity Risk lndex <br />rating and score for Kittitas County. <br />Table 4-136. Volcanic Activity Risk Index (FEMA National Risk lndex) <br />Tabfe 4-137 represents the Volcanic Activity Total Risk Score for the Kittitas County, based on the Risk <br />Assessment Methodology, as defined in Section 4.3 of this Plan. <br />Table 4-137. Volcanic Activity Total Risk Score <br />$1.8 Million nla $2.0 Million 84.9 Very HighKittitas County $165,032 <br />Expected annual /oss scores are calculated utilizing an equation that combines values for exposure, annualized frequency, and historic loss <br />ratios (Expected Annual Loss = Exposure x Annualized Frequency x Historic Loss Ratio). <br />Population <br />Equivalence <br />Total <br />Expected <br />Annual <br />Loss <br />Expected <br />Annual <br />Loss <br />Score <br />Jurisdiction RatingBuilding <br />Value <br />Agriculture <br />Value <br />80.9Kittitas County Very High <br />Risk Index scores are calculated using an equation that combines scores for Expected Annual Loss due to natural hazards, Social <br />Vulnerability and Community Resilience (Expected Annual Loss x Social Vulnerability / Community Resilience = Risk Index). <br />Jurisdiction Rating Score <br />Hazard <br />Event Probability <br />Factor Vulnerability lmpact <br />20Volcano Activity 1 12 6 tc 33 <br />Consequence: Sum of all weighted factors. <br />Extent: Sum of the weighted Extent factors. <br />Vulnerability: Sum of the weighted Vulnerabilitv factors. <br />lmpactClassificationVulnerability <br />Impact: Sum of the weighted lmpact factors. <br />Total Risk Score = Probability x Consequence <br />* Normalized to 100 <br />0 -24Low (L)1 0-6 0-6 0-12 0 -24 <br />Medium (M)2 7-12 7-12 13-26 25-50 25-52 <br />J 13 - 1B 13-18 27 -39 51 -75 53 and above <br />The legend-specifically the assignment of low, medium, and high-provides an additional means to qualitatively assess the probability factor, sum of <br />weighted factors, and the total risk scores for each hazard. The Consequence Score represents fhe surn of the Extent, Vulnerability, and lmpact Factors. <br />The Tolal Risk Score is a measure of Probabilitv and Conseouence. <br />! i ir:jir (ili i1)) <br />Total Risk Score Legend <br />:lt,) L <br />Total Risk <br />Score <br />Chapter 4: Hazard ldentification and Risk Assessment 184