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IOWA CITY — Don Guckert’s job is keeping the buildings on the University of Iowa’s charming campus up and running, and safe. His most important lessons came from the worst days of his career, in June 2008, when the waters of the Iowa River washed across the campus, causing catastrophic damage.

The night before the waters flowed over the backbreakingly stacked sandbags, Mr. Guckert recalled, “I walked into the house, and looked at my wife and said, ‘We’re going to lose the campus.’ ”

In all, the raging waters caused $750 million in flood damage, with $36 million in equipment lost in one building alone. Twenty-two major buildings were damaged, some of them irreparably; a quarter of the school’s classroom space was lost, and one-sixth of the university’s 2.6 million square feet of space was closed. The level of flooding “was unfathomable to those of us who lived through the previous record flood” of 1993, said Rod Lehnertz, the university’s senior vice president for finance and operations.

Now Mr. Guckert has a side gig. He travels the country, telling other institutions what he and the University of Iowa have learned from the disaster, and explaining how others can prepare for the worst. Mr. Guckert said that in a changing world, people might not know what the worst could mean.