13 - RESOLUTION ADOPTING THE 2017 LAMAR COUNTY MITIGATION PLAN

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Lamar County Multi- Jurisdictional Hazard Mitigation Plan Chapter Three 5. Probability of Future Events Lamar County receives abundant rainfall mainly in the spring and fall. Consequently, rivers and creeks overflow their banks during these seasons. Many of these floods are of small consequence; However, the number of major floods in the last 100 years warrants a highly likely probability rating. 6. Vulnerability Any structure or property that is located in a floodplain is vulnerable to flooding. A property's vulnerability to a flood depends on its location in the floodplain. The properties that lie along the banks of a waterway are the most vulnerable and are often repetitive loss structures. Lamar County has no repetitive loss structures but does have roads and bridges that are located in these flood areas. The property within the floodplain is broken into zones depending on its distance from the waterway. The 10 -year flood zone is an area that has 10% chance of flood every year. Encompassing the 10 -Year flood zone and extending further out from the water way is the 50- year floodplain. This area has a 2% chance of flooding each year. Encompassing both the 10- year and the 50 -year and extending further away is the 100 -year flood zone because of the thought that it would only occur once every 100 years but in reality may happen more often. Flooding vulnerability in Lamar County is primarily in the floodplain. Lamar County does have a secondary risk from dams of flooding. There are several dams in the county they have the potential to cause major flooding damages if they are breeched. The areas that are vulnerable to this type of flooding are identified in Section Nine. Table 6: Flood Zone Designations 91 D Areas with a 1 % annual chance of flooding and a 26% chance of flooding A (High Risk) over the life of a 30 -year mortgage. Because detailed analyses are not performed for such areas; no depths or base flood elevations are shown Areas with a 1 % chance of flooding and a 26% chance of flooding over the AE, A1-A30 (High Risk) life of a 30 -year mortgage. In most instances, base flood elevations derived from detailed analyses are shown at selected intervals. Areas with a 1 % annual chance of shallow flooding, usually in the form of a pond, with an average depth ranging from 1 to 3 feet. These areas have a AH (High Risk 26% chance of flooding over the life of a 30 -year mortgage. Base flood elevations derived from detailed analyses are shown at selected intervals. AO (High Risk) River or stream flood hazard areas and areas with a 1 % or greater chance of shallow flooding each year, usually in the form of sheet flow, with an average depth ranging from 1 to 3 feet. These areas have a 26% chance of flooding over the life of a 30 -year mortgage. Average flood depths derived 91