Why Is It Almost Impossible to Keep Water from Seeping

question 18

Multiple Choice

Why is it almost impossible to keep water from seeping under a levee and out onto a floodplain?

• A) Bigger rocks are typically placed at the bottom of levees, and they are most permeable.
• B) Levees are built on floodplains marked everywhere by old permeable stream channels.
• C) People building levees often forget to line the stream channel with plastic.
• D) Piping (large tubes) are built near the top of the levee to prevent overtopping.
• E) Metallic walls that are placed into the ground rust and fail after two or three years.

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