Here's why:
* Formation: When a river overflows its banks, the velocity of the water slows down. This causes the water to deposit sediment, primarily coarser material like sand and gravel, along the river's edge. Over time, these deposits build up, forming raised banks called levees.
* Function: Natural levees act as natural flood defenses, preventing future floods from spilling out over a wider area. They also create a slight elevation along the river, which can be important for agriculture and development.
* Distinguishing Features: Natural levees are typically long, narrow ridges, often parallel to the river channel. They are usually slightly higher than the surrounding floodplain.
Let me know if you have any other questions!
