The risk of flooding in the United States is changing regionally, and the reasons could be shifting rainfall patterns and the amount of water in the ground. The threat of flooding is growing in the northern half of the U.S. and declining in the southern half.

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The risk of flooding in the United States is changing regionally, and the reasons could be shifting rainfall patterns and the amount of water in the ground. The threat of flooding is growing in the northern half of the U.S. and declining in the southern half.