A Landslide Hazard Rating System for Colorado Highways

Landslides pose hazards along many stretches of Colorado highways. To assist in quantifying hazards and risks from known, existing landslides and to help prioritize their importance, the Colorado Landslide Hazard Rating System (CLHRS) was developed as a companion to the existing rockfall rating system used by CDOT. A preliminary version of the CLHRS was generated based on a review of the current body of technical literature regarding the factors that contribute to landslide hazard, consequence, and risk. It consisted of eleven Hazard Factors and eight Consequence Factors to calculate an overall risk score. The preliminary CLHRS was used to evaluate 69 landslides distributed throughout western Colorado. The resulting scoring distributions were then subjected to a suite of statistical analyses in order to identify the factors that possessed the greatest statistical merit. The statistical screening led to a final functional version of the CLHRS consisting of six Hazard Factors (geology, vegetative cover, slope aspect, surface water influence, failure frequency, and slope angle) and six Consequence Factors (depth to slide plane, length of highway affected, average daily traffic, detour options, worst-case scenario detour time, and annual maintenance cost). The CLHRS total risk scores clearly identify a subset of the landslides with both highest hazard characteristics and potential consequences.

• Record URL:
  • https://doi.org/10.1061/9780784413807.009
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784413807
• Supplemental Notes:
  • © 2014 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Pratt, Dan
  • Santi, Paul
• Conference:
  • 2014 Biennial Rocky Mountain Geo-Conference
  • Location: Lakewood Colorado, United States
  • Date: 2014-11-7 to 2014-11-7
• Publication Date: 2014-11

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 120-138
• Monograph Title: Rocky Mountain Geo-Conference 2014

Subject/Index Terms

• TRT Terms: Average daily traffic; Costs; Embankments; Geology; Geotechnical engineering; Groundwater; Highway safety; Landslides; Mathematical models; Ratings; Risk assessment; Risk management; Roadside hazards; Rockfalls; Vegetation
• Identifier Terms: Colorado Landslide Hazard Rating System
• Geographic Terms: Colorado
• Subject Areas: Geotechnology; Highways; Security and Emergencies; I26: Water Run-off - Freeze-thaw; I42: Soil Mechanics; I43: Rock Mechanics;

Filing Info

• Accession Number: 01545555
• Record Type: Publication
• ISBN: 9780784413807
• Files: TRIS
• Created Date: Nov 26 2014 3:07PM