Jefferson County - East-West Gateway Coordinating Council

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124 WORKSHEETS Jefferson County – Section 2 JEFFERSON COUNTY HAZARD ANALYSIS NARRATIVE WORKSHEETS JEFFERSON COUNTY HAZARD PROFILE WORKSHEETS JEFFERSON COUNTY RISK ASSESSMENT WORKSHEETS JEFFERSON COUNTY RISK INDEX WORKSHEETS JEFFERSON COUNTY VULNERABILITY WORKSHEETS
A Regional Overview All-Hazard Mitigation Plan 125 HAZARD ANALYSIS NARRATIVE Hazard: Dam Failure Description of Hazard (Type of hazard, pathways/areas likely affected, type of damage, etc.) A dam failure is defined as structural failure of materials used in dam construction, inadequate maintenance, overtopping by flood, foundation defects and piping/cracking caused by movements from settling of dam. Damage occurs downstream from a failing dam to lives of residents and their property, businesses, infrastructure. Depending upon volume of water released, damage could be catastrophic in a limited area. Historical Statistics (Frequency, strength, # of lives lost, # of injuries, economic losses, etc.) Based on the National Dam Inventory maintained by the USCOE, Missouri has 607 dams that are considered a high hazard. Historic dam failures have occurred just south of the EWGCC region near Lawrenceton in 1968 (Ste. Genevieve County), Washington County in 1975, in Fredericktown in 1968 (Madison County) and a near failure in Franklin County in 1978. The EWGCC region has the largest number of dams in Missouri. No lives have been lost as a result of these dam failures. No data is available on the number of injuries or economic losses as a result of these failures. Statement of Future Probable Severity (Catastrophic/Critical/Limited/Negligible). Severity of future dam failures will be catastrophic in the path of the released waters. For topographically higher areas surrounding the failed dam, negligible impacts will occur. Statement of Probable Risk (Likeliness of future occurrence- (Highly Likely/Likely/Possible/Unlikely). According to Missouri Department of Natural Resources, Dam and Reservoir Safety Program, it is likely that future occurrences of dam failures will occur based on the poor conditions of the existing dams. Statement of Next Disaster’s Likely Adverse Impact on the Community (Catastrophic/Critical/Limited/Negligible). Severity of future dam failures will be catastrophic in the path of the released waters. For topographically higher areas surrounding the failed dam, negligible impacts will occur. Without mitigation measures: Life Property Emotional Financial Comments: Catastrophic Catastrophic Catastrophic Catastrophic With mitigation measures: Life Property Emotional Financial Negligible Negligible Negligible Negligible
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8 Federal Sources TITLE: PRE-DISAST
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12 TITLE: SOIL AND WATER CONSERVATI
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4 The mitigation goals include the
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14 Community Action Type of Strateg
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16 1,2,3,4,5,6,7,8,9, Revise flood-
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18 Encourage development of jurisdi
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Jefferson County - East-West Gateway Coordinating Council

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