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2025 Hazard Mitigation Plan <br />Kittitas Gounty, Washington <br />Table 4-84. Riverine Flooding Risk Index (FEMA National Risk Index) <br />Table 4-85 represents the Flood Total Risk Score for the Kittitas County, based on the Risk Assessment <br />Methodology, as defined in Section 4.3 of this Plan. <br />Table 4-85. Flood Total Risk Score <br />84.44Kittitas County Very High <br />Risk lndex scores are calculated using an equation that combines scores for Expected Annual Loss due to natural hazards, Social <br />Vulnerability and Community Res/ience (Expected Annual Loss x Social Vulnerability / Community Resilience = Risk Index). <br />Jurisdiction Rating Score <br />Hazard <br />Event Probability <br />Factor Vulnerability lmpact <br />Flood 2 18 11 31 60 <br />Consequence: Sum of all weighted factors. <br />Extent: Sum of the weighted Extent factors. <br />Vulnercbility: Sum of the weighted Vulnerabilitv factors. <br />lmpactClassificationVulnerability <br />lmpact: Sum of the weighted Impact factors. <br />Total Risk Score = Probability x Consequence <br />* Normalized to 100 <br />0-12 0 -24 0 -24Low (L)1 0-6 0-6 <br />25-52Medium (M)2 7 -12 7-12 13-26 25-50 <br />J 13-18 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 />weightedfactors,andthetotalriskscoresforeachhazard. TheConsequenceScorerepresentslhesumoftheExtent,Vulnerabilily,andlmpactFactors. <br />The Total Risk Scorc is a measure of Probabilitv and Conseduence. <br />l i. i,) <br />Total Risk <br />,,,,'r,t tii[ ji: <br />1-{,:i lil' <br />lt9 <br />i l rri, iil ii ill' <br />Total Risk Score Legend <br />1i:Total Risk <br />Score <br />Chapter 4: Hazard ldentification and Risk Assessment 141