<P> Following the Great Flood of 1927 , the US Army Corps of Engineers was charged with taming the Mississippi River . Under the Flood Control Act of 1928 , the world 's longest system of levees was built . Floodways that diverted excessive flow from the Mississippi River were constructed . While the levees prevented some flooding , scientists have found that they changed the flow of the Mississippi River , with the unintended consequence of increasing flooding in succeeding decades . Channeling of waters has reduced the absorption of seasonal rains by the floodplains , increasing the speed of the current and preventing the deposit of new soils along the way . </P>
<P> Following the Great Flood of 1927 , the US Army Corps of Engineers was charged with taming the Mississippi River . Under the Flood Control Act of 1928 , the world 's longest system of levees was built . Floodways that diverted excessive flow from the Mississippi River were constructed . While the levees prevented some flooding , scientists have found that they changed the flow of the Mississippi River , with the unintended consequence of increasing flooding in succeeding decades . Channeling of waters has reduced the absorption of seasonal rains by the floodplains , increasing the speed of the current and preventing the deposit of new soils along the way . </P>
when was the mississippi river levee system built
when was the mississippi river levee system built
1928
1928