HDOT Climate Resilience Action Plan | May 2021

economic impacts of climate change,” including following the Honolulu Climate Change Commission’s Sea Level Rise Guidance to assume a 3.2 feet sea level rise by mid-century and a 6-foot rise by the end of the century as planning benchmarks. The sea level guidance, as well as a guidance for revisions to the shoreline setback rules, are located at the following links: » City and County of Honolulu, Office of the Mayor. 2018. Directive No. 18-2: City and County of Honolulu Actions to Address Climate Change and Sea Level Rise. Accessed July 27, 2020 from: https://static1.squarespace.com/static/5e3885654a153a6ef84e6c9c/t/5ef3b2774954db49fc136b20/1593029 239884/Mayor%27s%2BDirective%2B18-02.pdf » City and County of Honolulu Climate Change Commission. 2019. Guidance on Revision to the Revised Ordinance of Honolulu Chapter 23, Regarding Shoreline Setbacks. https://static1.squarespace.com/static/59af5d3cd7bdce7aa5c3e11f/t/5e54414b18df847f4c6610e3/1582580 063308/ROH+23+Shoreline+Setback+Guidance.pdf B.3.2 ESTABLISHMENT OF NO BUILD ZONES BY COUNTY GOVERNMENTS Most counties in Hawai‘i, which are responsible for shoreline setbacks, Special Management Areas (SMAs), and building permits, are moving toward defining “no build” zones to prevent future improvements in areas exposed to sea level rise and coastal erosion. Both Maui and Kaua‘i Counties have already instituted shoreline setback rules, which use multiple criteria to determine appropriate setback distances. The City and County of Honolulu is also likely to start modifying its uniform 40-foot shoreline setback and its SMA to include parts of the 3.2-feet sea level rise exposure area projected to occur in the State by the end of the century that are not currently in the SMA. Such changes will affect future land use decisions and coastal highway development. County of Maui: https://www.mauicounty.gov/697/Shoreline-Setback-Area-Limitations County of Kaua‘i: https://www.kauai.gov/Government/Departments-Agencies/Planning-Department/Shoreline- Setback B.3.3 COUNTY HAZARD MITIGATION AND RESILIENCE PLANS As with State government, county governments also prepare their own Hazard Mitigation Plans (HMP), focusing on local vulnerability to natural events such as sea level rise, flooding, and landslides. In addition, county governments are increasingly incorporating climate planning in their planning documents. Examples at the local level include the following: » Ola, the O‘ahu Resilience Strategy. Prepared by the City and County of Honolulu. 2019. Accessed July 27, 2020 from: https://www.resilientoahu.org/resilience-strategy » West Kaua‘i Community Vulnerability Assessment . University of Hawai‘i Sea Grant College Program. 2020. Accessed July 27, 2020 from: http://seagrant.soest.hawaii.edu/coastal-and-climate-science-and- resilience/ccs-projects/west-kauai-community-vulnerability-assessment/ » West Maui Community Plan Update . County of Maui, Department of Planning. 2019. Prepared for West Maui Community Plan Advisory Committee. Accessed July 27, 2020 from: https://wearemaui.konveio.com/draft-west-maui-community-plan » County of Hawai‘i’s Climate Change Action Report . County of Hawaii Research and Development Management Department. 2020. Accessed July 27, 2020 from: https://www.rd.hawaiicounty.gov/economic- development/climate-change-action.

( B-4 ) HAWAI‘ I HIGHWAYS | CLIMATE ADAPTATION ACTION PLAN