Optimizing Bridge Elevations to Reduce Flood DamagePosted: Jan 28, 2021
Currently, bridge superstructures are designed based on the 100-year flood with a required amount of freeboard, or clearance distance between the water surface and the low chord of the girder, for bridges to allow for wave surges and debris to pass under the bridge. However, there is a trend toward more frequent occurrences of low-probability storm events that increase the probability of damage to bridges and the road network. Results from the fragility analysis were then used to determine the elevation adjustments needed to reach a level that would reduce post-flood repair cost, increase bridge safety during a low-probability storm event, and increase the flood resiliency of the transportation system. John W. van de Lindt, Ph.D. Reducing Flood Vulnerability of Communities with Limited Road Access by Optimizing Bridge Elevation |