- Associated Press - Friday, June 13, 2014

DAYTON, Ohio (AP) - State transportation officials who studied last month’s flooding of southwest Ohio highways called it a “rare and extreme” event and said no major changes to the roadways are needed.

The Ohio Department of Transportation says the flooding that overwhelmed sections of Interstate 70 and Interstate 75 north of Dayton was the result of unusually heavy rain. The agency says so much rain fell in some locations that it was the equivalent of a 1,000-year flood.

The agency said in a report released Thursday that the highways weren’t designed for the extreme event that resulted in 4 feet of water on some sections and required some motorists to be rescued from their swamped cars.

The Dayton Daily News (https://bit.ly/1pRskRr ) reported that total rainfall in the area of the flooding was about 4½ inches in a 2-hour period.

The agency said the interstates are designed for a 50-year flood, the standard since the interstates were built.

“According to the National Oceanic and Atmospheric Administration’s point precipitation frequency estimates this equates to what is commonly referred to as at least a 1,000-year flood,” the agency said in the report. “Another way to say it would be the probability of that amount of rain in that duration has the probability of happening, 0.1 percent chance in a year’s time.”

The interstates, the agency said, “held up well and are in good shape. You cannot plan nor design for such a rare and extreme event and we have no plans to make any changes to the highway system at this time.”

The flooding did no lasting damage to highway drainage systems, agency inspectors said.

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Information from: Dayton Daily News, https://www.daytondailynews.com

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