The flooding that resulted in the deaths of four people in the Chattanooga area was a once-in-a-century event, according to the Tennessee Department of Transportation.
More than 6.4 inches of rain fell on Tuesday, according to the National Weather Service in Morristown. The total is second only to 9.49 inches that fell in the Chattanooga area in 2011 as a result of Tropical Storm Lee.
"This storm event, which had a 0.2% probability of occurrence, made it a once-in-a-century event and far exceeded the design standard that was used in accordance with state and federal standards," according to the Tennessee Department of Transportation.
