The rockfall hazard rating system.

PDFTech ReportFHWA-OR-GT-92-05DTFH61-89-C-00078RockfallsHazard evaluationCostsRatingsWorkshopsSlopesSystemsOregonOregon State Highway Division. Engineering Geology GroupPierson, Lawrence A.Oregon State Highway Division. Engineering Geology GroupUnited States. Federal Highway AdministrationUS Transportation CollectionThe development and dissemination of the Rockfall Hazard Rating System (RHRS) is complete. RHRS is intended to be a proactive tool that will allow transportation agencies to address rationally their rockfall hazards instead of simply reacting to rockfall accidents. The RHRS provides a defensible, standardized way to spend the limited construction funds available by numerically differentiating the apparent risk at rockfall sites.Much of the RHRS's rating is subjective. Proper training in its application is necessary to ensure the consistency of ratings between different raters. The responsibility for slope evaluations and design concepts should rest with experienced individuals.The Oregon Department of Transportation (ODOT) began developing the RHRS in 1984. Funding from a Federal Highway Administration (FHWA) sponsored pooled-fund, Highway Planning and Research (HPR) Grant allowed ODOT to complete development of the system, test it at over 3,000 sites, prepare an RHRS Implementation Manual, and conduct five multi-state training workshops around the country. The workshops gave participants an introduction to the RHRS and guidance on how to implement the system