We partnered with the City of Burnsville to develop a slope failure risk assessment. Our suite of GIS-based models determined the likelihood that slope failures will have a negative impact on city infrastructure, private property, and/or impact accessibility for emergency response professionals. Field assessments provided additional information that informed the final risk factors for each location. Our collaboration with the city and emergency management professionals developed risk rankings based on three categories that summarize the impact slope failures may have on specific locations. These risk factors were used to select slopes for mitigation activities.
A geohazard risk program was developed as part of the city’s asset management program. The project included the following phases: desktop analysis using our Geographic Information Systems (GIS) model, Field Verification, Risk Estimation, and Monitoring and Mitigation Programs.
Model results objectively identified risk of slope failure within the city. Field results validated the model and identified several failure types including gullying, slides, river migration, and springs. Each of the slopes were ranked using the Slope Risk Matrix previously developed with the city. The rankings indicated if mitigation, further study, monitoring, or no further action was required. Initial ranking results identified the slopes recommended for mitigation. Repair designs and cost estimates for each of these slopes were outlined and incorporated as part of the 2019 Burnsville Ravine Project.