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Agricultural productivity loss as a result of soil and crop damage from flooding
Date:2/18/2014

st through the 2002 Karnak breach and into the middle Cache River valley to the Diversion to Mississippi River, which was already above flood stage so the floodwaters continued west. In late April, the Ohio River floodwaters then started to flood the towns of Olive Branch and Miller City, the Horseshoe Lake area, and surrounding agricultural lands. On May 2, 2011, the Len Small levee on the Mississippi River failed and resulted in the flooding of an additional 30,000 acres of Illinois public and private lands.

Illinois agricultural statistics recorded the harvest of 4,500 fewer acres of corn and 6,500 fewer acres of soybeans in Alexander County in 2011. Soybean production was 1,200,000 bushels in 2010 but dropped to 865,000 bushels in 2011 due to flooding from both the Ohio and Mississippi rivers and crop and soil damage. The floodwaters also scoured lands in some places and deposited sand in other locations.

Olson cautioned that, had winter wheat been planted outside the levees in the fall of 2010, the wheat crop would have drowned. "Illinois farmers are aware of the flooding potential, especially in the winter and early spring, so they don't plant winter wheat on unprotected bottomlands," he said. "Consequently, there was no crop loss outside the levees in April and May of 2011. Local floodwater in the lower Cache River Valley, south of the Mississippi River Diversion and Dike, could not flow back into the Ohio River. It was blocked by the Cache River levee on the south side and by the closed gate at the Ohio River levee. Instead, water backed up and flooded forested and agricultural lands along the lower Cache River and north of the Cache River levee," Olson said.

Olson said that the damage to the land could have been much worse. "Land use changes, diversion ditches and levees, loss of wetlands and flood-holding capacity, internal channelization of the Cache River and tributaries, and an ever-changing climate have altered the hydrology
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Contact: Debra Levey Larson
dlarson@illinois.edu
217-244-2880
University of Illinois College of Agricultural, Consumer and Environmental Sciences
Source:Eurekalert  

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