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What is a Watershed?

Explore the concept of watersheds and how precipitation contributes to the flow of rivers to the sea. Learn about the diverse scales of watersheds and the effects of surface materials on infiltration and surface runoff. Discover the importance of trees in preventing landslides and river flooding. This project is supported by a grant from Washington's National Park Fund.

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What is a Watershed?

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  1. What is a Watershed? From Precipitation to the River FREEING THE ELWHA

  2. What is a Watershed? All the area where precipitation that falls funnels down into a river that flows to the sea. FREEING THE ELWHA

  3. Watersheds Can Vary Widely in Scale Columbia Basin Basins are depressions surrounded by higher terrain that collect water FREEING THE ELWHA

  4. Infiltration: Surface Runoff or Infiltration FREEING THE ELWHA

  5. Aquifer and the Water Table Pond Water Table Unsaturated Zone Permeable Rock Spring Aquifer Impermeable Bed Rock River Permeable Rock FREEING THE ELWHA

  6. Effects of Surface Materials on Infiltration and Surface Runoff Why did the soils in the areas that were clear-cut have landslides and river flooding, while the areas that still had trees suffer few problems? FREEING THE ELWHA Photos courtesy of Seattle Times

  7. This project was made possible in part by a grant from Washington’s National Park Fund. FREEING THE ELWHA

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