Why are buried oil and gas pipelines vulnerable to damage during a flood?
a. The pipes rise with the rising water level, causing the pipes to break.
b. The large amounts of sediment flowing during a flood puts additional pressure on the pipes.
c. Channel scour can erode down to the pipeline level, and tumbling rocks can sever the pipe.
d. When the levee is overtopped, the dropping water level can expose the pipe, leading to damage.
e. If the oil and gas are shut off, the pipe becomes lighter and can float to the bankfull level.
ANSWER: c
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