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<br />C-4 <br />Next, indicate the number (if any) of repetitive loss structures in your jurisdiction that have been mitigated. <br />Mitigated for this exercise means that flood protection has been provided to the structure. If you do not <br />know the answer to this question, the planning team will provide it for you. <br />Hazard Risk Ranking <br />The risk ranking performed for the overall planning area is presented in the risk assessment section of the <br />overall hazard mitigation plan. However, each jurisdiction has differing degrees of risk exposure and <br />vulnerability and therefore needs to rank risk for its own area, using the same methodology as used for the <br />overall planning area. The risk-ranking exercise assesses two variables for each hazard: its probability of <br />occurrence; and its potential impact on people, property and the economy. A detailed discussion of the <br />concepts associated with risk ranking is provided in the overall hazard mitigation plan. The instructions <br />below outline steps for assessing risk in your jurisdiction to develop results that are to be included in the <br />template. <br />Determine Probability of Occurrence for Each Hazard <br />A probability factor is assigned based on how often a hazard is likely to occur. In Table 1, list the probability <br />of occurrence for each hazard as it pertains to your jurisdiction, along with its probability factor, as follows: <br />– High—Hazard event is likely to occur within 25 years (Probability Factor = 3) <br />– Medium—Hazard event is likely to occur within 100 years (Probability Factor = 2) <br />– Low—Hazard event is not likely to occur within 100 years (Probability Factor = 1) <br />– None—If there is no exposure to a hazard, there is no probability of occurrence (Probability <br />Factor = 0) <br />Table 1. Hazard Probability of Occurrence <br />Hazard Type Probability Probability Factor <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />The probability of occurrence of a hazard event is generally based on past hazard events in an area. For <br />example, if your jurisdiction has experienced two damaging floods in the last 25 years, the probability of <br />occurrence is high for flooding and scores a 3 under this category. If your jurisdiction has experienced no <br />damage from landslides in the last 100 years, your probability of occurrence for landslide is low, and scores <br />a 1 under this category. <br />Determine Potential Impacts of Each Hazard <br />The impact of each hazard was divided into three categories: impacts on people, impacts on property, and <br />impacts on the economy. These categories were also assigned weighted values. Impact on people was <br />assigned a weighting factor of 3, impact on property was assigned a weighting factor o f 2 and impact on <br />the economy was assigned a weighting factor of 1. Steps to assess each type of impact are described below.