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Buffer Waves Diagram

 

Correct

Buffer Waves

Buffer waves are formed when the river flows into an obstacle.

The wave is formed upstream of the bank or obstacle. The more water hitting the obstacle, the bigger the buffer wave. If the river is hitting an obstacle and there is no buffer wave then the obstacle is undercut and very dangerous.

Swimmers can be pushed under the surface by a buffer wave and not surface until they are some distance downstream.

 

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