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CHAPTER 16. PLANNING AREA RISK RANKING <br />16-4 <br />16.3. RISK RATING AND RANKING <br />The risk rating for each hazard was determined by multiplying the probability factor by the sum of the <br />weighted impact factors for people, property and operations, as summarized in Table 16-5. <br />Based on these ratings, a priority of high, medium or low was assigned to each hazard. The hazards ranked <br />as being of highest concern are earthquake and severe weather. Hazards ranked as being of medium concern <br />are landslide, flood and wildfire. The hazards ranked as being of lowest concern are drought and dam <br />failure. Table 16-6 shows the hazard risk ranking. <br /> <br />Table 16-5. Hazard Risk Rating <br />Hazard Event Probability Factor Sum of Weighted Impact <br />Factors <br />Total (Probability x <br />Impact) <br />Avalanche 3 (3+2+1) = 6 3x6 = 18 <br />Dam Failure 1 (3+4+1) = 8 1x8 = 8 <br />Drought 3 (0+0+3) = 3 3x3 = 9 <br />Earthquake 3 (9+6+1) = 16 3x16 = 48 <br />Flood 3 (6+4+1) = 11 3x11 =33 <br />Landslide 3 (3+2+1) = 6 3x6 = 18 <br />Severe Weather 3 (9+6+2) = 17 3x17 = 51 <br />Volcano 1 (9+2+1) = 12 1x12 = 12 <br />Wildfire 3 (3+2+1) = 6 3x6 = 18 <br /> <br />Table 16-6. Hazard Risk Ranking <br />Hazard Ranking Hazard Event Category <br />1 Severe Weather High <br />2 Earthquake High <br />3 Flood High <br />4 Avalanche Medium <br />4 Landslide Medium <br />4 Wildfire Medium <br />5 Volcano Low <br />8 Drought Low <br />9 Dam Failure Low <br /> <br />