Flooding can be seen on O'Neal Lane, looking north from I-12 in Baton Rouge, La. Courtesy of the Louisiana Department of Transportation and Development hide caption

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Courtesy of the Louisiana Department of Transportation and Development

From Morning Edition: Debbie Elliott Describes Flooding, Rescues

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Two cars are submerged in floodwaters in a park in Kimmswick, Mo. Gov. Jay Nixon has declared a state of emergency because of widespread flooding around the state, which has closed many roads. Jeff Roberson/AP hide caption

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Jeff Roberson/AP

A steamboat drifts along the Mississippi River in New Orleans. A group called America's Watershed Initiative says "funding for infrastructure maintenance means that multiple failures may be imminent" for the lower Mississippi River basin. Mario Tama/Getty Images hide caption

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Mario Tama/Getty Images

In the past decade, freshwater and sediment diverted from the nearby Mississippi River have turned what once was an open bay into a thriving wetlands area. Local environmental groups have planted thousands of cypress trees, attempting to create a marsh that will help absorb storms that pass through. Weenta Girmay for WWNO hide caption

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Weenta Girmay for WWNO

In Louisiana, Rebuilding Mother Nature's Storm Protection: A 'Living Coast'

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This is a calculated flood map for the city of St. Louis. Water depth goes from deep (dark blue) to shallow (white, light blue). Floodwater can come from the Illinois, Upper Mississippi and Missouri rivers, as well as from heavy local precipitation. Courtesy of Dag Lohmann/Katrisk hide caption

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Courtesy of Dag Lohmann/Katrisk

Flood Maps Can Get Much Sharper With A Little Supercomputing Oomph

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The ill-fated Sultana in Helena, Ark., just before it exploded on April 27, 1865, with about 2,500 people aboard. Most were Union soldiers, newly released from Confederate prison camps. Library of Congress hide caption

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Library of Congress

The Shipwreck That Led Confederate Veterans To Risk All For Union Lives

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Commercial fisherman Ronnie Hopkins (left) and his assistant, Armondo, catch Asian carp on Lake Barkley, Ky. Paul Rister/AP hide caption

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Paul Rister/AP

Carp(e) Diem: Kentucky Sends Invasive Fish To China

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This WWII-era minesweeper once was a floating museum in St. Louis. Swept away in a 1993 flood, it has been under water in the river for most of the years since. But the ship has been exposed as the river's water level has fallen. (Photo taken on Dec. 14.) Army Corps of Engineers hide caption

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Army Corps of Engineers

IMF chief Dominique Strauss-Kahn, waits be arraigned on sexual assault charges at Manhattan Criminal Court in New York, on Monday, May 16, 2011. Emmanuel Dunand/AP hide caption

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IMF head Dominique Strauss-Kahn is taken out of a New York police station on May 15, 2011. JEWEL SAMAD/AFP/Getty Images hide caption

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JEWEL SAMAD/AFP/Getty Images

Although the Lighthouse Point Casino in Greenville, Miss., is on a barge, the rest of the facility is on land and on May 5, 2011, staff spent the day clearing it out. Rogelio V. Solis/AP hide caption

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Rogelio V. Solis/AP