The reality of a changing climate means that transportation and planning agencies need to understand the potential effects of changes in storm activity, sea levels, temperature, and precipitation patterns; and develop strategies to ensure the continuing robustness and resilience of transportation infrastructure and services. This is a relatively new challenge for California’s MPOs and RTPAs – adding yet one more consideration to an already complex and multifaceted planning process. In that light, this guide is intended to support planning agencies in incorporating the risks of climate change impacts into their existing decision-making, complementing the broader planning and investment processes that MPOs and RTPAs already manage.
This guide was designed to account for the varying capacities and resources among MPOs and RTPAs, featuring methods that can be used by organizations seeking to conduct a more sketch-level assessment of the risk and vulnerability of the regional transportation assets to climate impacts, or in-depth analysis that incorporates separate stakeholder processes and geospatial analyses. It is oriented to provide information for two types of audiences.
- A Basic User, a MPO or RTPA conducting climate impact assessments and/or climate vulnerability and risk assessments for the very first time. This pathway is appropriate for agencies with limited resources and GIS capability.
- An Advanced User, a MPO or RTPA that has experience with climate impact assessments, has strong interagency partnerships with universities, natural resources agencies or public works departments and have more staff resources and technical tools to dedicate to the effort.
For both of these user types, this guide is a resource to help MPOs and RTPAs to:
- Assess the relative risks to their transportation system infrastructure and services of different climate stressors (sea-level rise, temperature changes, precipitation changes, extreme weather events);
- Conduct an asset inventory and vulnerability assessment of existing infrastructure;
- Incorporate climate impact considerations into future long-range transportation planning and investment decisions.
Currently, there is no requirement to date to incorporate climate adaptation into regional transportation planning. Nevertheless, this guide provides information and tools to help MPOs/RTPAs anticipate the incorporation of climate assessment and adaptation into future planning efforts.