Landslides in WNC

When it comes to landslide safety and preparedness, the advice is simple: get to higher ground, fast.

Resources

Intro to Landslides in NC — page by NC Dept of Environmental Quality

 Historical NC Landslides — page by NC Dept of Environmental Quality

Historical Landslides in WNC — presentation by NC Geological Survey

Haywood County GIS

Landslide Maps of WNC — Website of Appalachian Landslide Consultants

Landslide Hazards Program — US Geological Survey

Landslides Caused by Helenean ongoing, multi-agency effort to map landslides associated with Hurricane Helene

Helene’s Deadly Legacy — United States Geological Survey report on the devastating landslides of Hurricane Helene

How Much Rain Can Trigger a Landslide?

  • More than 5 inches of rain in 24 hours can lead to scattered landslides on forested and modified slopes
  • More than 10 inches of rain in 24 hours will cause widespread landslides (similar to what happened in Hurricane Helene in 2024) on all types of slopes

 

 

Featured Story

“These types of events happen every few decades,” said Dr. Ben Mirus, a USGS research geologist. “But the sheer scale and speed of what we saw after Helene really pushed the limits of what communities—and scientists—were prepared for.”

Click box to read full story: “Hurricane Helene’s Deadly Landslide Legacy

What Can You Do If You Live Near Steep Hills?

 

Before Intense Storms:

  • Become familiar with the land around you. Learn whether debris flows have occurred in your area by contacting local officials, emergency management officials, State geological surveys or departments of natural resources, and university departments of geology. Slopes where debris flows have occurred in the past are likely to experience them in the future.
  • Support your local government in efforts to develop and enforce land-use and building ordinances that regulate construction in areas where landslides are likely to happen. Buildings should be located away from steep slopes, streams and rivers, intermittent-stream channels, and the mouths of mountain channels. 
  • Watch the patterns of stormwater drainage on slopes near your home and note especially the places where runoff water converges, increasing flow over soil-covered slopes. Watch the hillsides around your home for any signs of land movement, such as small landslides or debris flows or trees that seem to tilt or change angle.
  •  Contact your local authorities to learn about the emergency-response and evacuation plans for your area and develop your own emergency plans for your family and business.

During Intense Storms:

  • Stay alert and stay awake! Many debris-flow fatalities occur when people are sleeping. Listen to the radio for warnings of intense rainfall. Be aware that intense short bursts of rain may be particularly dangerous, especially after longer periods of heavy rainfall and damp weather.
  • If you are in an area susceptible to landslides and debris flows, consider leaving if it is safe to do so. Remember that travel during an intense storm is hazardous.
  • Listen for any unusual sounds that might indicate moving debris, such as trees cracking or boulders knocking together. A trickle of flowing or falling mud or debris may precede larger flows. If you are near a stream or channel, be alert for any sudden increase or decrease in water flow and for a change from clear to muddy water. Such changes may indicate debris-flow activity upstream, so be prepared to move quickly. Don’t delay! Save yourself, not your belongings.
  • Be especially alert when driving. Embankments along roadsides are particularly susceptible to landslides. Watch the road for collapsed pavement, mud, fallen rocks, and other indications of possible debris flows.

What to do if you suspect a landslide is about to happen:

  •  Evacuate, if possible.
  •  Contact your local fire, police, or public works department.
  •  Inform neighbors.

After landslides occur:

  • It is best to stay away from the slide area, as there may be danger of additional slides; however, this is not always possible or desirable.
  • Check for injured and trapped persons near the slide area. Give first aid if trained, and call for help.
  • Remember to help your neighbors who may require special assistance—infants, elderly people, and people with disabilities.
  • Listen to a battery-operated radio or television for the latest emergency information.
  • Check for damaged utility lines. Report any damage to the utility company.
  • Check the building foundation, chimney, and surrounding land for damage.
  • Replant damaged ground as soon as possible because erosion caused by loss of ground cover can lead to flash flooding.
  • Seek the advice of a geotechnical expert for evaluating landslide hazards or designing corrective techniques to reduce landslide risk.
  • Do not remove debris at the foot of a landslide without consulting an expert. This could cause the landslide to restart.

Information from: United States Geological Survey Landslide Handbook

Gallery: Past Haywood County Landslides

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