PowerPoint Presentation Steep Slope Part 1 NC Land Resources

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Landslide Hazard Mapping Program Activities,
Products and Deliverables By Rebecca
Latham Rick Wooten Anne Witt North Carolina
Geological Survey September 22, 2005
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Hurricane Recovery Act of 2005

• NCGS received 1.6 million to produce landslide
  hazard maps for the 19 counties listed in the
  bill
• Macon County is our pilot county
• Plan to produce maps for 2-3 counties per year
• Priority based on population, available data,
  landslide history
• Additional funding may accelerate the process

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• LSHM deliverables include the following
• Landslide and landslide deposit locations
• Geologic map (where available)
• Critical soils map (where available)
• Slope map
• Landslide susceptibility map showing high,
  moderate, and low landslide potential

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Landslide and Landslide Deposit Locations
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Geologic Maps
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Evaluate GIS Debris Flow Susceptibility Models
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• Major activities to date include the following
• Staffing and building expansion
• Data acquisition
• Landslide inventory
• Response to public safety/EM requests for
  technical assistance
• Public outreach
• RAMP UP!!!

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Historical Data
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Soil Survey Data
Data Acquisition
Bedrock Geologic Data
Rainfall Data
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• Imagery Landslide Mapping
• Identify
• Locate
• Date
• Measure
• Assess Damage
• Vegetation Moisture Conditions
• Development Slope Modifications

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Imagery
Satellite Imagery
LIDAR
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Landslide Inventory
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Soil Sampling, Testing, and Analysis
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Respond to EM Requests for Technical Assistance
July 14, 2005 Slope Failure Transylvania County
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Public Outreach

• Publications
• Citizens Guide to Geologic Hazards
• Citizens Guide to Landslide Hazards
• Presentations
• Emergency Management
• Local Government
• Media
• Newspaper
• Television

• General Public
• Professional Meetings

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• Hurricane Recovery Act of 2005 Landslide Hazard
  Mapping
• Red Flag Maps
• Areas that need to be field checked.
• Not a new state regulatory program.
• Informational maps provided to counties.
• Cooperative Studies with Coweeta Hydrologic
  Laboratory.
• Iterative process we are learning as we go.

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Peeks Creek Debris Flow Macon County
What Happened Debris flow traveled 2.25 miles
from near the top of Fish-hawk Mountain down
slope to the Cullasaja River. When Around
1010 p.m. on Sept. 16, 2004 as Hur-ricane Ivan
passed over Western North Carolina. Damage 5
people killed, 2 seriously injured, and 20-30
homes severely damaged or destroyed. (http//www4
.ncdc.noaa.gov/cgi-win/wwcgi.dll?wweventShowEvent
553823)
Photo from Macon County News Shopping
Guide September 23, 2004 edition
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Macon County Pilot Study
Location of Peeks Creek Debris Flow
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Radar image from the NWS office in Greer, SC at
948 p.m. on Sept. 16, 2004
Image from Lamb, 2004
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Velocity and Discharge Estimates
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View of the Initiation Zone
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Ancient Debris Flow Deposits
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Damage in the Peeks Creek Community
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Peeks Creek Debris Flow
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Questions?