Why Did Extensive Flooding Occur Upstream of St

question 22

Multiple Choice

Why did extensive flooding occur upstream of St. Louis during the 1993 Mississippi River flood?

• A)Widespread urbanization in the upper portion of the basin increased runoff to a great degree.
• B)Floodwalls protecting St. Louis caused a bottleneck in the river's flow.
• C)The St. Louis floodwall failed, flooding St. Louis and the area upstream.
• D)An intense thunderstorm dropped several inches of rain on the area in only a few hours.

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