Central Artery and Tunnel Pilot Project
The Central Artery/ Tunnel (CA/T) Vulnerability and Adaptation Assessment, completed in June 2015, created the hydrodynamic Boston Harbor Flood Risk Model (BH-FRM) to identify risk and depth of water resulting from storm surge induced coastal flooding in the City of Boston under current and future sea levels. Based on the CA/T system's high sensitivity to flooding and little redundancy built into it, the CA/T study recommended conceptual level adaptation strategies for current and future time horizons. Please see the Climate Change and Extreme Weather Vulnerability and Adaptation Options for the Central Artery/Tunnel System (Pilot Project Report, available for download below) for more details on the study, and the following section for the CA/T Study Mapping Products.
We are currently considering the recommendations presented in the report. However, to supply adaptation measures sooner, MassDOT is developing an alternate strategy to provide protection to 2030.
CA/T Study Mapping Products
The CA/T Vulnerability and Adaptation Assessment team developed Coastal Flood Exceedance Probability Maps and Estimated Flood Depth Maps for the 2013, 2030 and 2070/2100 climate scenarios They are available for download within the sections below . These maps are not meant for design use and are provided to the public for discussion and research purposes only. The maps represent Version 3 of the Boston Harbor Flood Risk Model (BH-FRM) model output and include updates in four specific areas: Allston, Morrissey Boulevard, Prudential Tunnel (I-90/MassPike) and Muddy River. Additionally, data quality checks were performed throughout the domain resulting in minor changes from Version 2. As from time to time we will update the BH-FRM, you encouraged to revisit MassDOT’s website for up to date information.
Download our project's Modeling Overview and FAQ's below for more information.
Coastal Flood Exceedance Probability Maps
The Coastal Flood Exceedance Probability Maps, available for download below, show the likelihood that a location within the Boston Harbor Flood Risk Model (BH-FRM) domain will be flooded by 2 or more inches of water encroaching on the land surface at a particular location in any given year. Exceedance probabilities range from 0.1% (probability associated with the 1000-year water surface elevation) to 100% (probability associated with the highest annual tide). Details of map development and modeling approaches are found in the downloadable Climate Change and Extreme Weather Vulnerability and Adaptation Options (CA/T) above.
Estimated Flood Depth Maps
The Estimated Flood Depth Maps show the anticipated depth of flood water in areas affected by the 100-and 1000-year water surface elevation under the 2013, 2030 and 2070/2100 climate scenarios. While the Coastal Flood Exceedance Probability Maps above show the probability that an area will be flooded, the Estimated Flood Depth Maps provided below show depths of flooding at either the 1% or 0.1% probabilities.
Additional Resiliency Projects Underway
The Deerfield River Watershed Vulnerability Assessment is evaluating the vulnerability to climate change of road-stream crossings within the Deerfield River Watershed. The assessment includes analyses of hydraulic and geomorphic failure risks under current and future climate conditions, potential impacts to emergency services, and opportunities for the enhancement of aquatic organism passage. Through this innovative and multi-disciplinary approach, the study team will create a prioritization and decision making tool that can be used during MassDOT's project planning and development process. This tool will facilitate a proactive approach to upgrading vulnerable structures, in place of the current event-driven reactive approach. This project was scheduled to be completed in December 2016.
The Coastal Transportation Vulnerability Assessment is refining the state-of-the-art Boston Harbor Flood Risk Model (BH-FRM) and extending it to the entire Massachusetts coastline to identify transportation assets vulnerable to sea level rise and storm surge. This project will evaluate impacts associated with the current year, 2030, 2050, and 2070/2100 climate scenarios and recommend conceptual-level adaptation strategies, considering both natural and built protection measures. The project is ongoing.
More State and Federal Climate Change Adaptation Information
The following links and downloads are available to provide you with further State and Federal climate change adaptation information.