Storms now pounding Southern California are raising the specter of more danger for residents—debris flows in areas already ...

After a wildfire, the danger continues, especially during torrential rain that can set off fast-moving landslides known as ...

Mudslides are dangerous torrents that are usually referred to by geologists and first responders as debris flows. They have been particularly lethal in parts of California where landscape, ...

Over the three-day storm, L.A. County's burn areas are expected to receive several inches of rain. How fast the rain falls can add to the risk.

San Gabriel Valley areas scarred by the Eaton Fire are at “high to very high risk” of debris flows this week. How do they ...

When hills are healthy, vegetation anchors soil in place. But when that vegetation is burned off, hillsides become vulnerable ...

While the Eaton Fire is contained, the danger to foothill communities is not. Heavy rainfall expected on Thursday and Friday ...

For years, authorities debated building a barrier to protect the Klabava River, south of Prague, from sediment and acidic ...

Rain on burned hillslopes can trigger dangerous floods and debris flows. Those debris flows can move with the speed of a ...