Jefferson County - East-West Gateway Coordinating Council

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130 Jefferson County – Section 2 With mitigation measures: Life Property Emotional Financial Comments: Limited Limited Critical Limited Recommendation: The County Hazard Mitigation Planning Committee to initiate a mitigation activity to convince various government agencies, businesses, county residents to retrofit buildings/infrastructure, businesses and homes in earthquake prone areas to help reduce the loss of life caused by earthquakes.
A Regional Overview All-Hazard Mitigation Plan 131 HAZARD ANALYSIS NARRATIVE Hazard: Flood Description of Hazard (Type of hazard, pathways/areas likely affected, type of damage, etc.) A flood is defined as an overflow or inundation that comes from a river or other body of water or causes or threatens damage, or any relatively high streamflow that overtops the natural or artificial banks in any reach of stream. The National Flood Insurance Program defines a flood as a general and temporary condition of partial or complete inundation of two or more acres of normally dry land or of two or more properties from inland waters, unusual and rapid accumulation or runoff of waters from any source or a mudflow. Floods are most likely to occur in the spring, but can occur in any time of the year. Any person or structure that is present in the path of floodwaters as described above could be damaged. Damage is most likely to occur within the flood insurance rate map designated 100 and 500-year areas. The amount of damage depends on 1). The intensity/strength of the flood, 2). The proximity of the flood to the person/structure. Damage can range from very slight to total. Hazards range from death to total property damage from floodwaters. Historical Statistics (Frequency, strength, # of lives lost, # of injuries, economic losses, etc.) The East-West Gateway Coordinating Council planning region has many river and small tributaries in both the unincorporated and incorporated areas that are susceptible to flooding. Catastrophic floods have occurred in the EWGCC region in 1927, 1951, 1973, 1979, 1982, 1984, 1986, 1993, 1994, 1994, 1995, 1998, 1999 and 2000. In the Chesterfield Valley of St. Louis County alone, damage from the 1993 flood totaled $200 million. (In the 1993 flood approximately $21 billion dollars in damage and costs and 48 deaths resulted (NOAA.) Multiple lives have been lost from flooding; 49 deaths were recorded from the 1993 Flood. Statement of Future Probable Severity (Catastrophic/Critical/Limited/Negligible) Critical Statement of Probable Risk (Likeliness of future occurrence- (Highly Likely/Likely/Possible/Unlikely)-Highly Likely to occur in future Statement of Next Disaster’s Likely Adverse Impact on the Community (Catastrophic/Critical/Limited/Negligible) Without mitigation measures: Life Property Emotional Financial Comments: Catastrophic Catastrophic Catastrophic Catastrophic With mitigation measures: Life Property Emotional Financial
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Jefferson County Hazard Mitigation
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16 1,2,3,4,5,6,7,8,9, Revise flood-
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Jefferson County - East-West Gateway Coordinating Council

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