Conducting a Landslide/Asset Management Inventory

The Ohio Department of Transportation (ODOT) selected Landslide Technology (LT) to assist them in developing a Landslide Hazard Rating Matrix (Ohio LHRM) as a tool to manage landslide hazards along ODOT highways. The Ohio LHRM provides a relative ranking of sites for landslide hazard and vulnerability, which ODOT utilizes as a tool for prioritizing capital expenditures for mitigation. The system takes failure/movement classification and causation, geologic and groundwater conditions, roadway construction methods and material properties, impacts of failures on roadways and traffic (i.e. detours, out of direction costs, etc.), failure and maintenance frequency, annual maintenance data and costs, remediation concepts and estimated costs, and public safety into account and yields a unique numerical rating for each slope.

The Ohio LHRM system was developed by LT in a phased approach in conjunction with the University of Ohio at Akron. During the initial phase, LT conducted reconnaissance investigations of approximately 44 landslides that were identified as representative failures from each of the ODOT Districts. Data gathered from the landslides were statistically analyzed to provide a basis for developing a rating system for the state as a whole. LT then developed rating criteria, assigned scoring and weighting values, and prepared field data collection forms that were tailored for ODOT and the geologic conditions that are encountered throughout their Districts.