A Visionary Approach to Advancing Sea Level Rise Adaptation in an Urban Coastal Community, Waikīkī, Hawai‘i

Abstract

In Hawai‘i, a $19 billion loss is anticipated due to the 3.2 feet (1 meter) of global sea level rise (SLR) predicted earlier this century to occur by 2100, while, in fact, 3 to 4 feet (.9 to 1.2 meters) of SLR by 2100 are now estimated as a mid-range scenario (HSCC, 2022). In Waikīkī, the economic hub of Hawai‘i’s tourism industry, future flooding caused by SLR, groundwater inundation, king tides, rainfall, and storm surge are projected to become a chronic disruption by mid-century (Habel et al., 2017, 2020). In contrast to retreat, one approach to managing SLR in dense urban areas, such as Waikīkī, is to consider an “in-place” flood adaptation or accommodation strategy. An interdisciplinary team of faculty and students at the University of Hawai‘i at Mānoa are merging science with design to create conceptual urban and architectural design renderings in order to visualize SLR adaptation strategies over time for buildings, utilities, transportation, and open space. Through iterative, structured public outreach, this research provides designers, planners, and policymakers with valuable insights into a diverse group of stakeholders’ preferences and their comments on each adaptation strategy. It supports the resilient planning goals outlined by the state, the City and County of Honolulu, and also the Waikīkī Special District Guidelines (DPP, 2021). In addition, through coursework and employment, students are learning how they might address SLR in their future careers.