The city of Boston yesterday filed an appeal with the Department of Homeland Security’s Federal Emergency Management Agency (FEMA) of the 2013 Preliminary Flood Insurance Rate Maps (FIRMs) for Boston.
The appeal comes after a study, completed by an independent consultant hired by the city, indicated inconsistencies and potential errors in the mapping and flood study approach used by FEMA. The city’s appeal will request that FEMA publish new Preliminary FIRMs based on the study’s findings, and hold a new 90-day appeal and public comment period.
"These maps have significant implications for Bostonians," Boston Mayor Martin J. Walsh said in a statement. "We are doing our due diligence to make sure they are established with the best available data and appropriate modeling methodology."
FEMA released Suffolk County’s new maps on Nov. 15, 2013, for public review. The new maps added 1,585 acres of land to the 100-year floodplain, which includes 13,709 housing units and 4,202 businesses. All properties with federally backed mortgages or loans in the 100-year floodplain are required to carry flood insurance and comply with flood protection standards in local zoning and state building codes.
The city of Boston hired Woods Hole Group (WHG) through a competitive bid process to evaluate FEMA’s flood mapping methodology, data sources and modeling. WHG’s final report found inconsistencies in FEMA’s mapping and flood study approach, which resulted in "approximately 507 acres of land that should be removed from the 100-year floodplain, as well as 33 acres that should be included," according to a press release from Walsh’s office.
FEMA has been updating FIRMs to more accurately delineate the areas subject to coastal flood hazards, known as the 100-year floodplain. Suffolk County’s maps were the last to be released in Massachusetts last November. The official comment and appeal period began on May 29 and ended on Aug. 27. The city solicited comments and appeals from the community to be submitted with its appeal. One comment was submitted.
WHG is currently conducting more detailed and accurate hydrodynamic flood modeling of Boston Harbor, which will be completed and submitted as supplemental information for a scientific appeal, according to the release.
