How do forests help prevent soil erosion and flooding?

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Tall giant sequoia trees with reddish bark and thick trunks rise closely together in a dense forest at Sequoia National Park, California. — tree A stand of giant sequoia trees (*Sequoiadendron giganteum*) in Sequoia National Park, California.

Forests are essential for soil stabilization and erosion control because they act as both filters and sponges. Their complex systems of roots, soil, and litter layers regulate the hydrologic cycle by intercepting precipitation and facilitating water infiltration into the ground.12

By slowing the movement of water and increasing the soil's capacity to store it, forests ensure that water yields are gradual and uniform. In contrast, unforested land sheds water rapidly, which can lead to sudden rises in river levels and increased flooding. Because forests effectively manage these water flows, they are considered the most desirable cover for watershed protection, significantly lessening the risk of floods and preventing washouts in mountainous or hilly regions.21