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The Great Mississippi Flood of 1927 was the most destructive river flood in the history of the United States, with 27,000 square miles inundated up to a depth of 30 feet. To try to prevent future floods, the federal government built the world's longest system of levees and floodways. Ninety-four percent of the more than 630,000 people affected by the flood lived in the states of Arkansas, Mississippi and Louisiana, most in the Mississippi Delta. More than 200,000 African Americans were displaced from their homes along the Lower Mississippi River and had to live for lengthy periods in relief camps. As a result of this disruption, many joined the Great Migration from the South to northern and midwestern industrial cities rather than return to rural agricultural labor. This massive population movement increased from World War II until 1970. ==Events== The flood began with extremely heavy rains in the central basin of the Mississippi in the summer of 1926. By September, the Mississippi's tributaries in Kansas and Iowa were swollen to capacity. On Christmas Day of 1926, the Cumberland River at Nashville, Tennessee exceeded 56.2 feet (17 m), a level that remains a record to this day, higher than the devastating 2010 floods. Flooding overtopped the levees, causing Mounds Landing to break with more than double the water volume of Niagara Falls. The Mississippi River broke out of its levee system in 145 places and flooded . This water flooded an area wide and more than long. The area was inundated up to a depth of 30 feet (10 m). The flood caused over $400 million in damages and killed 246 people in seven states. The flood affected Missouri, Illinois, Kansas, Tennessee, Kentucky, Arkansas, Louisiana, Mississippi, Oklahoma, and Texas. Arkansas was hardest hit, with 14% of its territory covered by floodwaters extending from the Mississippi and Arkansas deltas. By May 1927, the Mississippi River below Memphis, Tennessee, reached a width of .〔(Science Question of the Week - natural disasters, floods - April 05, 2002 )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Great Mississippi Flood of 1927」の詳細全文を読む スポンサード リンク
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