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2009 North Dakota floods : ウィキペディア英語版 | 2009 North Dakota floods The US State of North Dakota experienced significant flooding in its major river basins in 2009, following abnormally heavy winter snows atop saturated and frozen ground. ==Background==
Ground which was already saturated when it froze at the onset of winter, melting snow which could not be absorbed by the frozen ground, and additional precipitation from a rain storm on March 22 and a later snowstorm, are reasons for the serious flooding. Heavy snowfalls fell in the state toward the end of March, adding to the existing snowpack.
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「2009 North Dakota floods」の詳細全文を読む
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