Jefferson County - East-West Gateway Coordinating Council

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146 HAZARD: Dam Failure JEFFERSON COUNTY HAZARD PROFILE WORKSHEET POTENTIAL MAGNITUDE (Percentage of jurisdiction that can be affected): X Catastrophic: More than 50% _ Critical: 25% to 50% _ Limited: 10 to 25% _ Negligible: Less than 10% <strong>Jefferson</strong> <strong>County</strong> – Section 2 FREQUENCY OF OCCURRENCE: _ Highly Likely: Near 100% probability in next year X Likely: Between 10 and 100% probability in next year, or at least one chance in 10 years _ Possible: Between 1 and 10% probability in next year or at least one chance in next 100 years. _ Unlikely: Less than 1% probability in next 100 years SEASONAL PATTERN: Dam failures would be related to seasonal patterns in terms the inability of a dam to withhold/withstand the deluge of a catastrophic rain event (spring rains) hitting a weakening dam infrastructure. AREAS LIKELY TO BE AFFECTED MOST (BY SECTOR): Areas most likely affected will be downstream from dams; torrential floodwaters from failed dam descending upon residential homes, businesses, schools, agricultural lands, and outbuildings. PROBABLE DURATION: By the nature of dam failures, the duration of the event will be instantaneous and the duration of the failure could last up approximately six hours dependent upon the size of the reservoir. POTENTIAL SPEED OF ONSET (Probable amount of warning time) X Minimal (or no) warning _ 6 to 12 hours warning _ 12 to 24 hours warning _ More than 24 hours warning EXISTING WARNING SYSTEMS: A few large Missouri dams have monitoring systems, emergency action plans and warning systems. However, most dams in Missouri do not.
A Regional Overview All-Hazard Mitigation Plan 147 COMPLETE VULNERABILITY ANALYSIS: Based on a single dam failure causing damage in ½% of the county, in the developed portion of the county, it has been estimated that approximately 1,050 persons and 250 buildings valued at $25 million dollars may be impacted from water inundation. In the undeveloped portion of the county, it has been estimated that approximately 200 persons and 75 buildings valued at $80,000 may be impacted from water inundation.
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Jefferson County - East-West Gateway Coordinating Council

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