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Understanding River Deposits: Deltas, Floodplains, & More

Explore how rivers shape landscapes through deposits like alluvial fans, deltas, and floodplains, and learn why people build near rivers despite flood risks. Discover how floods impact communities and methods used to prevent flooding.

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Understanding River Deposits: Deltas, Floodplains, & More

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  1. 11.2 Stream and River Deposits

  2. Even though flooding along rivers is potentially harmful, many farms are located near rivers. Why do people build along rivers? Floodwaters bring fertile sediment deposits, which enrich the soil. Rivers supply a method of transportation for goods.

  3. Deposition • The process in which material is laid down or dropped.

  4. Deposition

  5. Sediment • Rock and soil that are deposited by streams.

  6. Deltas • A fan-shaped pattern that is created when a river may deposit its load. • Forms on a flat surface and is made mostly of mud.

  7. Delta

  8. Alluvial Fans • Fan-shaped deposits of material, that unlike deltas, form on dry land. • Found in some desert regions of California.

  9. How are deltas and alluvial fans examples of ways in which rivers streams change Earth’s landscape? * Rivers and streams change Earth’s landscape by carrying sediment from one place to another. Deltas and alluvial fans result when the river or stream’s load is deposited.

  10. Flood • When a stream overflow its banks.

  11. Floodplain • The area along a river that forms from sediment deposited when a river overflows its banks.

  12. Floodplain

  13. River Flood ..\..\video clips\11.2 River and Stream Deposits\Explanation_of_Flooding__Watershed__River__and_Flood_Plain_asf.asf

  14. Dam • A barrier that can redirect and hold a portion of the floodwater in a reservoir.

  15. Dam _

  16. Levee • The buildup of sediment deposited along the channel of a river. • Helps keep rivers inside its banks.

  17. List two ways in which floods affect people. * Floods can affect people by causing property damage and death.

  18. Review Questions • Why are floodplains both good and bad areas for people to live? * Floodplains form fertile farmland because flood waters periodically deposit new soil on the land. However, flooding can cause property damage and endanger lives.

  19. Describe three landscape features that form as a result of stream deposition. • *Floodplains, alluvial fans, and deltas are three landscape features that form as a result of stream deposition. • Floods are natural events.Why do humans try to prevent floods? • * Humans try to prevent floods from occuring because floods can cause property damage and death.

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