Following the Great Flood of 1927, multiple states needed money to rebuild their roads and bridges. Louisiana received $1,067,336 from the federal government for rebuilding, but it had to institute a state gasoline tax to create a $30,000,000 fund to pay for new hard-surfaced highways. The
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. The levees did not prevent recurrences of significant flooding, especially a major flood in 1937. To better study and plan for future situations, Lt. Eugene Raybold proposed laying out a physical hydraulic model to simulate the basin's response to various rainfall scenarios. Land was procured at the SE edge of
Clinton, Mississippi, and a 200-acre hydraulic model was constructed, matching to the river's flow from
Baton Rouge to
Omaha, modeling the confluence points of its major tributaries across 16 states. The work was completed during 1942, with some labor provided by
POWs from
Camp Clinton. The Corps used this model to accurately study river flows and mitigation strategies, but by 1970 it fell out of use. In the 1970s it was transferred to the city government of Jackson, and the Buddy Butts Park was created around it. It is presently little-known or recognized. The devastation of the flood and the strained racial relations resulted in many African Americans joining the
Great Migration from affected areas to northern and midwestern cities, a movement that had been underway since
World War I. The flood waters began to recede in June 1927, but interracial relations continued to be strained. Hostilities had erupted between the races; a black man was shot and killed by a white police officer when he refused to unload a relief boat at gunpoint. Near
Helena, Arkansas,
Owen Flemming was lynched after he killed a plantation overseer, who wanted to force him to rescue the plantation owner's mules. As a result of displacements lasting up to six months, tens of thousands of local African Americans moved to the big cities of the North, particularly
Chicago; many thousands more followed in the following decades.
Herbert Hoover enhanced his reputation by his achievements in directing flood relief operations as
Secretary of Commerce under President
Calvin Coolidge. The next year Hoover easily won the
Republican 1928 nomination for President, and the general election that year. In upstate Louisiana, anger among yeomen farmers directed at the New Orleans elite for its damage of downriver parishes aided
Huey Long's election to the governorship in 1928. These densely populated camps required basic necessities which were difficult to attain, such as water and sanitation facilities. Hoover used a combination of bureaucratic resources and grassroots forces to give the tent cities the opportunity to become self-sufficient. This method presented difficulties, as rural leaders were unprepared to manage the chaotic circumstances found in large camps. This led Hoover eventually to place the relief camps under government supervision. Later reports about the poor treatment in camps led Hoover to make promises of change to the African-American community, which he broke. As a result, he lost the black vote in the North in his re-election campaign in 1932. ==Representation in other media==