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In roundtable discussions with state DOT representatives focused on the budgetary, planning, engineering design, and operations and maintenance functions of DOTs, the following characteristics were identified as key elements of transportation resilience: • Determining a return on investment of resilience projects • Implementing consistent framework for assessing asset vulnerability • Updating design manuals and utilizing AASHTO and FHWA guidance documents • Incorporating risk assessment and life-cycle costs in project designs • Prioritization of maintenance based on risk.
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, resulting in an 81% response rate. Case example interviews were conducted with five state DOTs rep resenting geographic diversity and all four AASHTO regions, wide representation of culvert types and materials installed and specified in their states, and a variety of potential threats that could affect resiliency, including floods, hurricanes, severe storms, and wildfires.
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• Thirty-eight participating state DOTs (90%) employ multiple post-event response practices to maintain, manage, and resume culvert function and performance after extreme weather events, including cleaning and removal of debris from affected culverts.
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A formalized rehabilitation guide providing standardized procedures with estimated costs of expected service life extensions would assist DOTs in decision-making to optimize culvert resilience. • Documenting major weather events to compare with asset management data to deter mine culvert vulnerability and risk exposure.
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