Why Are Artificial Levees Only Useful for Some Flooding Events

Why are artificial levees only useful for some flooding events?

A) Levees cannot be built larger than the surrounding floodplain.
B) Flash floods occur too quickly for officials to close the levees.
C) Levees are built in rural areas and will not help for flooding in the city.
D) Large floods can create high pressures and undermine the levee.

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