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.

---

Definitions:

Standard

An established norm or requirement, often official, that specifies guidelines or criteria for procedures, products, or systems.

USB

Universal Serial Bus, a standard for cables and connectors used to connect computers and peripherals.

Optical Disc

A storage medium that uses laser technology to read and write data, examples include CDs, DVDs, and Blu-ray discs.

Nonvolatile Memory

A type of computer memory that retains its data even when the device's power is turned off, such as flash memory or ROM.