How is it determined that a 100-year flood occurred, and what does that mean? And, perhaps more important, with a month left in monsoon season and more rain on the way, what's the likelihood another one will strike?
The designation arose in 1973 when the National Flood Insurance Program was looking for a standard for determining a city or area’s floodplain. According to a, the 100-year flood was a compromise that “fell between what the Corps of Engineers had used as the protection level when they built dams and levees and what most communities used when they designed their stormwater systems.”
A pedestrian bridge over Mill Creek is laden with trees and debris Sunday, Aug. 21, 2022, following Moab's 100-year flood. A Mill Creek gauge on the west side of Moab showed the river was 10 feet higher than its average of about 4.5 feet at that gauge. The NWS received one report that a total of 1 ¼ inches of rain fell just southeast of town between 7-9 p.m. Nearly an inch of that, however, dropped in a 20-minute sprint early in the deluge.NWS data shows Mill Creek swelled to 7.4 feet — five times its normal depth — before entering Moab and was twice that, about 10-feet deeper than usual, after passing through town.
He and his crew went out that night to check on structural damage incurred by the city’s bridges as well as monitor Mill Creek’s water levels. The water rose above two of Moab’s eight roadway bridges and three of its 11 pedestrian bridges. Williams said he believed debris catching under the roadway bridge on 300 South and forcing water up over it was at the root of most of the flooding downtown.
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