It is also referred to as the 100-year flood and is the basis for the NFIP administered by FEMA. Photo simulations of how future flooding might impact local landmarks are also provided, as well as data related to water depth, connectivity, flood frequency, socio-economic vulnerability, wetland loss and migration, and. Use of spaces below SLR-DFE are limited to access for vertical circulation structures, flood prevention measures, storage, and parking.Īll projects that are subject to BPDA’s Article 80 large and small project review will be required to comply with the CFR Design Guidelines. Base Flood A flood having a 1 percent (or 1 in 100) chance of occurring in any given year. NOAA's Sea Level Rise map viewer gives users a way to visualize community-level impacts from coastal flooding or sea level rise (up to 10 feet above average high tides).Gross Square Floor Area will exclude structures needed for vertical circulation and areas devoted to flood protection measures.Structures needed for vertical circulation and mechanical systems referenced above will be excluded from measurement of lot coverage and open space.An allowance for side and rear yard encroachments for new structures to house mechanical systems to ensure they are not located in basements or beneath the Sea Level Rise Design Flood Elevation (SLR-DFE). Areas subject to inundation by the 1 annual chance flood event with additional hazards due to storm induced velocity wave action.An allowance for side and rear yard encroachments for structures, such as stairs or ramps needed for vertical (access) circulation, due to a higher first floor elevation.Building heights to be measured from 2 feet above the Sea Level Rise Base Flood Elevation (SLR-BFE), rather than at grade. Areas subject to inundation by the 1-percent-annual-chance flood event with additional hazards due to storm-induced velocity wave action.The intent of the new overlay district is to facilitate flood resilient design and prevent flood damage by elevating buildings’ occupiable space and floodproofing areas beneath flood elevations. Based on climate modeling, Boston is anticipated to experience a 40-inch sea-level rise by 2070. Elevation and Freeboard (additional height above the NFIP’s base flood elevation) are specified as a function of the Flood Design Class and the nature of the flood hazard areas (see table on page 4 of these Highlights). The new zoning overlay includes areas beyond those identified in current FEMA flood maps. Article 25A provides a new Coastal Flood Resilience (CFR) Zoning Overlay District requiring new development and retrofits to take steps to limit building damages due to coastal storms and sea-level rise. As part of The City of Boston’s commitment to climate resilience, on September 13, 2021, the Boston Planning & Development Agency (BPDA) approved Article 25A of the Boston Zoning Code.
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