Developing a Methodology to Assess Transportation Vulnerability to Recurrent Tidal Flooding

Despite the moniker of “nuisance flooding,” the recurrent flooding of coastal cities during high tides poses risks to people and property that extend beyond minor inconveniences. The frequency of this recurrent tidal flooding is expected to increase as sea levels rise. Using publicly available data, this study develops a methodology to assess local vulnerability of coastal cities’ transportation infrastructure and residents to tidal flooding. Geospatial analysis methods identify roads, public transit infrastructure, and socially vulnerable populations with potential physical exposure to flooding, while an evaluation of local planning documents suggests a lack of preparedness for coastal flood hazards. Recommendations for improving and expanding upon this exploratory methodology are provided, as are recommendations to local officials and stakeholders for reducing risk in the face of this growing hazard.