HDOT Climate Resilience Action Plan | May 2021

Synthesizes lessons learned and innovations from a variety of recent FHWA studies and pilots to help transportation agencies address changing climate conditions and extreme weather events at the asset level. Provides information on why, where, and how to integrate climate considerations into the project development process. Practical information in related disciplines is provided such as climate science and economics and lessons learned from project-level studies of engineering adaptation options. Climate change stresses examined included: sea level rise and storm surge impacts on a coastal bridge, barrier island roadway over washing from sea level rise and storm surge, living shoreline along coastal roadways exposed to sea level rise, temperature and precipitation impacts on cold region pavement, temperature and precipitation impacts to pavements on expansive soils, precipitation and temperature impacts on rock and soil slope stability, and addressing environmental conditions in the design of roadways built on permafrost. » Incorporating Risk Management into Transportation Asset Management Plans. November 2017. Office of Asset Management. Accessed July 27, 2020 from: https://www.fhwa.dot.gov/asset/pubs/incorporating_rm.pdf Guidance amending 23 U.S.C. 119 as per MAP-21 to develop risk-based TAMPs. The required risk-based TAMP takes risk-performance factors into account, provides guidance on the risk element of the TAMP, defines risk, and provides guidance on how the risk element can be applied to meet risk-based TAMP requirements. A risk-based TAMP is one that identifies, assesses, and prioritizes the uncertainties, variability, and threats that could impede its objectives. A risk-based plan also may make trade-offs based on risks. Limited resources may be prioritized to high-risk assets or to make the transportation network more resilient to the greatest threats. » Highways in the River Environment — Floodplains, Extreme Events, Risk, and Resilience, 2nd Edition. June 2016. Highway Engineering Circular No. 17, 2nd edition. Report HIF-16-018. Accessed July 27, 2020 from: https://www.fhwa.dot.gov/engineering/hydraulics/library_arc.cfm?pub_number=16&id=162 This manual provides technical guidance and methods for assessing the nexus of riverine and transportation as it relates to floods, floodplain policies, extreme events, climate change, risks, and resilience. An important focus is quantifying exposure to extreme flood events considering climate change and other sources of nonstationarity. Describes and discusses: 1) FHWA and other floodplain policies and guidance, 2) uncertainty associated with hydrologic models, 3) nonstationarity and two drivers: climate change and land use/land cover changes, 4) several tools for identifying and adjusting for trends in the historical record, 5) techniques for projecting floods, 6) global/regional climate models, downscaling techniques, and emissions scenarios, and 7) risk and resilience and the probabilistic nature of flood events. » Highways in the Coastal Environment: Assessing Extreme Events : 2014. Volume 2, 1st edition. FHWA Publication Number: NHI-14-006. Hydraulic Engineering Circular No. 25, Volume 2. Accessed July 27, 2020 from: https://www.fhwa.dot.gov/engineering/hydraulics/pubs/nhi14006/nhi14006.pdf The purpose of this manual is to provide technical guidance and methods for assessing the vulnerability of coastal transportation facilities to extreme events and climate change. The focus is on quantifying exposure to sea level rise, storm surge, and wave action. This manual focuses only on extreme events along the coast such as storm surge and waves found in hurricanes, nor’easters, fronts, and El Niño-related coastal storms on the west coast. Tsunamis are also discussed as extreme events. Examples of damage to coastal infrastructure resulting from storm surge and waves that are addressed by the methods in this manual include: 1) damage to coastal bridge superstructures in Hurricanes Ivan and Katrina due to waves on storm surge, 2) damage to highway embankments and pavements due to waves and flowing water in storm surges

( B-10 ) HAWAI‘ I HIGHWAYS | CLIMATE ADAPTATION ACTION PLAN