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Landslides and Mud Flows

Landslides and mudflows usually strike without warning. The force of rocks, soil, or other debris moving down a slope can devastate anything in its path.


Before a landslide

  • Get a ground assessment of your property.

  • Your county geologist or county planning department may have specific information on areas vulnerable to landslides. Consult a professional geotechnical expert for advice on corrective measures you can take.

    •

    Insurance

  • Mudflow is covered by flood insurance policies from the National Flood Insurance Program. Flood insurance can be purchased through a local insurance agency.

    •

    Minimize home hazards

  • Plant ground cover on slopes to stabilize the land, and build retaining walls.

  • Build channels or deflection walls to direct the flow around buildings.

  • Remember: If you build walls to divert debris flow and the flow lands on a neighbor’s property, you may be liable for damages.

    •

    Make evacuation plans

  • Plan at least two evacuation routes since roads may become blocked or closed.

    •

    Learn to recognize the landslide warning signs

  • Doors or windows stick or jam for the first time.

  • New cracks appear in plaster, tile, brick or foundations.

  • Outside walls, walks or stairs begin pulling away from the building.

  • Slowly developing, widening cracks appear on the ground or on paved areas.

  • Underground utility lines break.

  • Bulging ground appears at the base of a slope.

  • Water breaks through the ground surface.

  • Fences, retaining walls, utility poles or trees tilt or move.

  • You hear a faint rumbling sound that increases in volume as the landslide nears. The ground slopes downward in one specific direction and may begin shifting in that direction under your feet.

    •

    During a landslide:

      If inside a building
    • Stay inside.
      •
    • Take cover under a desk, table or other piece of sturdy furniture.

      If outdoors

    • Run to the nearest high ground in a direction away from the path.

      •

    • If rocks and other debris are approaching, run for the nearest shelter such as a group of trees or a building.

    • If escape is not possible, curl into a tight ball and protect your head.

    After a landslide

    • Remember that flooding may occur after a mudflow or a landslide.

    • Stay away from the slide area; there may be danger of additional slides.

    • Check for injured and trapped persons near the slide area. Give first aid.

    • 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 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. Erosion caused by loss of ground cover can lead to flash flooding.

    DOH Pub 821-035
    Revised - March 2008

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