Word: superflood
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Dates: during 1930-1939
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...Army's flood control plan (General Jadwin's plan modified) was to provide protection from the maximum possible flood. Army Engineers and the Weather Bureau calculated this "superflood" by taking the maximum known flood of each of the Mississippi's great tributaries and assuming that they all hit the main river at once-which they have never done...
...present flood in part foiled these plans. It was not the superflood planned for. Most of the big tributaries, such as the White, Arkansas and Ouachita Rivers, were below record heights. But the Ohio was far above its highest record made in 1913, and since the Ohio enters the Mississippi higher than all the others, the Army's flood control works from Cairo to the White River were receiving a much more severe test than the Army's superflood contemplated...
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