This file contains 3 sets of shapefiles representing possible Flood Hazard Zone Areas in the 2020's, 2050's, and 2080's, based upon a rapid ice melt scenario. The NYC Office of Long-Term Planning and Sustainability (NYC OLTPS) and the City of New York assume no responsibility for the accuracy of this data or its suitability for any purposes. All users should independently verify the accuracy of the data for their purposes. This data on 1-in-100 year flood zones for New York City with Projected Sea Level Rise was produced by the Institute for Sustainable Cities, City University of New York for an analysis of large geographic areas only. 1. Methods and Caveat – The projected flood extents included in this data reflect a “bathtub” methodology whereby a flood elevation is extrapolated landward until it reaches the equivalent contour height on land. This approach does not account for cumulative effects of soils, vegetation, surface permeability, bathymetry, infrastructure and beach structures, friction, and other factors that affect the movement of floodwaters resulting in local variations in flooding extent. 2. Error – Numerous sources of potential error are present in the data. These include limitations of model input and scope (climate and FEMA floodplain models), error inherent in model output, errors in and coarseness of topography, the rounding of base flood elevations to the nearest foot, and in GIS technique. 3. Interpretation - The floodplains delineated in this data do not represent precise flood boundaries but rather illustrate two distinct areas of interest: A) areas that do not currently flood but are expected to potentially do so in the future and B) areas that do not currently flood and are unlikely to do so in the timeline of this research.
In the next map, I added the Hurricane zones where A is the most servere. The 2080 senario is in cross hatch. You can see for the St. George area, the projected flood zones for 2080 follows the Hurricane Zone pattern, but not exactly.