The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to earth's surface using the UTM projection and coordinate system.The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000.

This layer illustrates an area of Westchester County that may be particularly vulnerable to the impact of coastal storms, including: storm surge, coastal flooding and wind hazards. Hazard potential associated with rainfall flooding is not considered. The boundaries of this zone were developed by Westchester County in cooperation with local municipal officials to promote community emergency planning and preparedness.

In July 2020, Westchester County GIS launched the new GeoHub website to make Westchester County geospatial data more organized and accessible to the general public. The site offers an abundance of free County-focused data and maps, including interactive mapping applications, which provide information on specific topics. From infrastructure to flood zones, ecosystems to census data, local businesses to nonprofits, the GeoHub offers a way to visualize, communicate, explore, analyze and plan. Click on this link to explore the GeoHub site.