maps.nyc.gov

maps.nyc.gov

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FEMA Modeling Task Force (MOTF) - Hurricane Sandy Impact Analysis created from field-verified High Water Marks (HWMs) and Storm Surge Sensor data from the U.S. Geological Survey (USGS), as of February 14, 2013. HWMs and Surge Sensor data are used to interpolate a water surface elevation, then subtracted from the best available Digital Elevation Model (DEM), to create a depth grid and surge boundary.
1% Annual Chance Floodplain (100 Year Floodplain) The area that has a 1% chance of flooding in any given year.

Flood Insurance Rate Maps (FIRMs) The best available flood hazard data. FEMA is in the process of updating the FIRMs for NYC & issued Preliminary FIRMs in December 2013 & 2015 as part of this process. The NYC Building Code requires new & substantially improved buildings to use the Preliminary FIRMs (unless the Effective FIRMs are more restrictive) until the maps become effective following the public comment period. The Preliminary FIRMs are not used to guide the requirements of the National Flood Insurance Program.

The potential areas that could be impacted by the 100-Year flood in the 2050s based on projections of the high-estimate 90th percentile sea level rise scenario (NYC Panel on Climate Change (NPCC) 2015 data).
High Tide with Projected 30" of Sea Level Rise High Estimate 90th percentile (NPCC & NYC Department of City Planning).