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University of Illinois study of 2011 flood will lead to better preparedness
Date:2/18/2014

In May 2011, when the U.S. Army Corps of Engineers used explosives to breach a levee south of Cairo, Ill., diverting the rising waters of the Mississippi and Ohio rivers to prevent flooding in the town, about 130,000 acres of Missouri farmland were inundated. It was the largest flood of the lower Mississippi ever recorded, and researchers from the University of Illinois at Urbana-Champaign took advantage of this "once-in-a-scientific-lifetime" occurrence to study the damage, funded by a National Science Foundation Rapid Response Grant. Their results, published this week in the journal Environmental Science and Technology, demonstrate that landscape vulnerabilities can be mapped ahead of time to help communities prepare for extreme flooding.

"There is overwhelming scientific evidence that the characteristics of extreme rainfall under climate change are going to be different," said Praveen Kumar, a professor of civil and environmental engineering (CEE) at Illinois and project leader on the study. "Forecasts of extremes of rainfall and flooding are not sufficient. The most urgent need is appropriate preparedness based on scientific assessment of landscape vulnerability."

The 2011 activation of the Birds Point-New Madrid (BPNM) Floodway resulted in the diversion of floodwater for 35 miles before it was directed back to the Mississippi at New Madrid, Mo. The Corps of Engineers also later opened the Bonnet Carr and Morganza spillways in Louisiana to ease pressure on the New Orleans levee system. The decision to inundate farmland was controversial because several hundred people live on the floodplain and the land is agriculturally valuable, said CEE PhD student Allison Goodwell, lead author of the paper.

"The consensus with BPNM is that it worked really well," Goodwell said. "It had a pretty immediate impact of lowering the levee stages all around the area."

The Illinois team included experts in hydrology, geography and
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Contact: Praveen Kumar
kumar1@illinois.edu
217-333-4688
University of Illinois College of Engineering
Source:Eurekalert  

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