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Eugene -Springfield Area Natural Hazards Mitigation Plan <br />5. Annexes <br />BA Hazard Risk Ranking <br />Table B-3 presents the ranking of hazards of concern, using vulnerability multiplied by <br />probability divided by capacity to calculate and prioritize total risk to Rainbow Water <br />District (see Section 4.2.2, Components of Risk Analysis, for an explanation of the Risk <br />Metrics). These are the identified hazards to RWD and may vary from those listed in <br />the Section 1, Table 1-1. <br />Table B-3 RWD Risk Matrix <br />Hazard <br />Vulnerability <br />Probability <br />Capacity 01w <br />Risk Total <br />Risk <br />High = 3 <br />High = 3 <br />High <br /><1.5 = Low <br />Moderate = 2 <br />Moderate = 2 <br />Capacity = 3 <br />1.6-2.9 = Moderate <br />Low = 1 <br />Low = 1 <br />Moderate = 2 <br />3-4.6 = High <br />Low=1 <br />>4.5 = Very High <br />Earthquake <br />3 <br />2 <br />1 <br />6 <br />Very High <br />Winter Storm <br />3 <br />3 <br />2 <br />4.5 <br />High <br />Flood - <br />3 <br />3 <br />2 <br />4.5 <br />High <br />verine <br />Windstorm <br />2 <br />2 <br />1 <br />4 <br />High <br />Drought <br />2 <br />3 <br />2 <br />3 <br />High <br />Wildfire <br />2 <br />2 <br />2 <br />2 <br />High <br />Geomagnetic <br />Disturbance <br />1 <br />3 <br />2 <br />1.5 <br />Low <br />GMD <br />Landslide <br />1 <br />2 <br />2 <br />1 <br />Low <br />Volcano <br />1 <br />1 <br />3 <br />.33 <br />Low <br />The RWD risk matrix differs slightly from the planning area. Flood — riverine risk is <br />raked high for RWD due to the location of our wellfields. Adjacent to the McKenzie <br />River, our wellfields are susceptible to flooding which could directly impact our access <br />to the wellfields and our ability to continue to safely supply water. Alternatively, <br />landslide risk is rated low because we do not have facilities in identified landslide - <br />prone areas, although pipelines still have some vulnerability. Finally, we rank <br />geomagnetic disturbance risk as low. A GMD could interrupt the electric grid or our <br />control systems, however we have multiple wells and expect to be able to continue <br />5-27 January 2020 <br />