2022 06 21 City Council
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26 Small, localized flood events are likely to occur at least two to three times every year in McMinn County. The severity of flooding that may occur in the county is measured by inches of rainfall and by feet of flooding. Based on previous occurrences, in a worst‐case scenario it is possible for the exte nt of a flooding event to exceed 15 inches of rainfall, mudslides and in March 2002, an event caused over $5 million in damages across East Tennessee. As seen with the May 2010 Tennessee Flood Event (DR‐1909), it is possible for 20 inches or more of rainfall to amass within two days (see following map). Tennessee May Flood‐ Precipitation for May 1st & 2nd 2010 Source: National Weather Service As seen below, a stationary frontal boundary stalled over or near the Tennessee Valley for nearly a week in mid to late February 2019. Persistent southwest flow aloft brought copious amounts of Gulf of Mexico moisture northward and interacted with this boundary for many days, causing a prolonged period of heavy rain and flooding throughout Tennessee from Tuesday , February 19 through early Sunday, February 24. Due to the heavy rainfall that had already fallen earlier in the month, along with the already unusually wet winter season, widespread flash flooding and river flooding resulted, with dozens of water rescues being conducted and numerous homes and businesses flooded. Additionally, there were numerous reports of mudslides throughout the state impacting critical interstate travel. In addition, this heavy rainfall set new monthly rainfall records for the month of February at many locations including Nashville and Crossville, both of which saw over a foot of rain. By the end of the month, nearly the entir e state of Tennessee had received between 10" and 20" of rain in February 2019. This event led to a Presidential Disaster Declaration (DR4427). Tennessee February 2019 Flood ‐ Precipitation for February 2019 107