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Environmental Science

When Rain Turns Burned Ground Into Rivers of Mud

Quick fact

Wildfires can create a water-repellent layer in the soil, drastically reducing infiltration. When rain falls, water runs off rapidly, picking up loose sediment and forming a debris flow.

Why this is interesting

After a wildfire, a gentle rain can suddenly trigger a fast-moving slurry of ash, boulders, and debris. What hidden changes in the soil make these deadly flows possible?