Certified Floodplain Manager (CFM) Practice Exam

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How is overbank flooding in riverine areas commonly triggered?

  1. Melting glaciers

  2. Excess rainfall or snowmelt exceeding channel capacity

  3. High tide

  4. Dam failure

The correct answer is: Excess rainfall or snowmelt exceeding channel capacity

Overbank flooding in riverine areas is commonly triggered by excessive rainfall or snowmelt that surpasses the channel's capacity. This can lead to the overflow of the river, causing water to spill onto the surrounding land. The other options, melting glaciers, high tide, and dam failure, are not common triggers for overbank flooding in riverine areas. Melting glaciers usually contribute to slow-rising river levels, high tide is only applicable to coastal areas, and dam failure is a less frequent occurrence compared to excess rainfall or snowmelt.

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