sylva rotary 9/18/2014 - landslides in wnc
DESCRIPTION
Sylva Rotary 9/18/2014TRANSCRIPT
Resources
Things to Look for
Landslide Information
OVERVIEW
Resources
Things to Look for
Landslide Information
OVERVIEW
NORTH CAROLINA LANDSLIDE INVENTORY
locations in ALC/NCGS database
Mapped Landslides = 3,512
Mapped Landslide Deposits = 3,311
• 48 people killed since 1916
• > 85 homes & other structures damaged or destroyed
• Millions of taxpayer and private dollars spent on repair and buyouts
WAYEHUTTA CREEK CREEK WATERSHED
PHASE I - INVENTORY
• 37 - Number of landslides • 9 Natural slopes
• 28 Modified slopes
• 3 Active landslides
• 6 High potential for future movement
WAYEHUTTA CREEK CREEK WATERSHED
PHASE I - INVENTORY
• 10 – Number of subsidence locations• 9 High potential for
future movement
WAYEHUTTA CREEK CREEK WATERSHED
PHASE I - INVENTORY
• 116 – Number of landslide deposits (660 acres)
TYPES OF LANDSLIDES IN WNC
• Debris Flows • Debris Slides• Weathered Rock Slides • Rock Slides
• Natural Slopes • Human Modified Slopes
DEBRIS FLOW – NATURAL SLOPE
Photo from NCGS
Photos from NCGS
Photo courtesy of Jackson Co. Erosion Control
DEBRIS SLIDE – MODIFIED SLOPE
DEBRIS SLIDE– MODIFIED SLOPE
Photo courtesy of Jackson Co. Erosion Control
Resources
Things to Look for
Landslide Information
OVERVIEW
EXISTINGSLOPE MOVEMENTS/SLOPE MOVEMENT DEPOSITS
Map from NCGS
Mapped Deposit
Recent slide area
Toe
active mainscarp
activeinternalscarp
inactive scarp
approximateoutline of debrisslide
Map and photos from NCGS
active scarp
Photos from NCGS
THINGS TO LOOK FOR:CRACKS IN THE GROUND
THINGS TO LOOK FOR:STRUCTURAL DAMAGE
THINGS TO LOOK FOR:ABUNDANCE OF CURVED OR LEANING TREES
Photo from NCGS
Resources
Things to Look for
Landslide Information
OVERVIEW
ONLINE RESOURCES
• Appalachian Landslide Consultants, PLLC website
• NC Geological Survey website
• National Environmental Modeling and Analysis Center (NEMAC) at UNC-Asheville,
• WNC vitality index – all mapped landslides
• OptIN Regional Planning Tool – Southwestern Commission Council of Government & Appalachian Regional Commission
APPALACHIAN LANDSLIDE CONSULTANTS
• Real Estate Property evaluations
• Buyers – looking for land or home
• Sellers – showcase safer building sites
• Owners – wanting to ensure peace of mind
• Developers – Find appropriate development areas, best use of resources on the land
• Landslide Susceptibility mapping
• Resources on ALC website, Facebook
HOW TO PROTECT YOURSELF?
• Be landslide aware
• Report area landslides
• Use the maps
• Call a professional
Jennifer B. Bauer, L.G.
Principal Geologist/Co-owner
Stephen J. Fuemmeler, L.G.
Principal Geologist/Co-owner
Thank You!
RESOURCES
• Appalachian Landslide Consultants, PLLC –
• Website - www.appalachianlandslide.com,
• Facebook - https://www.facebook.com/pages/Appalachian-Landslide-Consultants-PLLC/331675916961376
• NC Geological Survey website - http://www.geology.enr.state.nc.us/Landslide_Info/Landslides_main.htm
• National Environmental Modeling and Analysis Center (NEMAC) at UNC-Asheville
• WNC vitality index – http://www.wncvitalityindex.org/gis/
• OptIN Regional Planning Tool - http://optinswnc.nemac.org/gis/
Slope MeasurementsDegrees PercentRatio
30º 1.75 H : 1 V 57%
22º 2.5 H : 1 V 40%
19º 2.9 H : 1 V 35%
39º 1.25 H : 1 V 80%
45º 1 H : 1 V 100%
34º 1.5 H : 1 V 67%
27º 2.0 H : 1 V 50%