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New York City's hurricane contingency plans are based on six evacuation zones. For more information visit NYC.gov or call 311 (TTY: 212-504-4155).
Hurrican evacuation zones should not be confused with flood insurance risk zones, which are designated by FEMA and available in the form of Flood Insurance Rate Maps (FIRMs).
The geodatabase contains a single feature class that shows two (2) flooding categories. The "1-Nuisance Flooding" (ponding depths greater or equal to 4 in. and less than 1 ft.) and "2-Deep and Contiguous Flooding" (ponding depths 1 ft. and greater) categories were created using hydrologic and hydraulic computer models and represent flood risk due to extreme rainfall. Please refer to the New York City Stormwater Resiliency Plan for more information on the purpose of the study, how datasets were developed, applications for this data, and other details.
A coded value domain is used for the "Flooding_Category" field. See Column Info tab of the Data Dictionary for definition of each code.
The New York City Stormwater Flood Maps show areas of potential flooding of at least 0.25 contiguous acres with flood depths of 4 inches or more. This dataset contains some potential flooding areas less than 0.25 acres due to proximity and overlap with masking layers.
The geodatabase contains a single feature class that shows three (3) flooding categories. The "1-Nuisance Flooding" (ponding depths greater or equal to 4 in. and less than 1 ft.) and "2-Deep and Contiguous Flooding" (ponding depths 1 ft. and greater) categories were created using hydrologic and hydraulic computer models and represent flood risk due to extreme rainfall. The third category, "3-Future High Tides 2050", shows coastal tidal inundation based on the NYC Panel on Climate Change 90th percentile estimates for the 2050's and is sourced from the NYC Flood Hazard Mapper. Please refer to the New York City Stormwater Resiliency Plan for more information on the purpose of the study, how datasets were developed, applications for this data, and other details.
A coded value domain is used for the "Flooding_Category" field. See Column Info tab of the Data Dictionary for definition of each code.
The New York City Stormwater Flood Maps show areas of potential flooding of at least 0.25 contiguous acres with flood depths of 4 inches or more. This dataset contains some potential flooding areas less than 0.25 acres due to proximity and overlap with masking layers.
The geodatabase contains a single feature class that shows three (3) flooding categories. The "1-Nuisance Flooding" (ponding depths greater or equal to 4 in. and less than 1 ft.) and "2-Deep and Contiguous Flooding" (ponding depths 1 ft. and greater) categories were created using hydrologic and hydraulic computer models and represent flood risk due to extreme rainfall. The third category, "3-Future High Tides 2080", shows coastal tidal inundation based on the NYC Panel on Climate Change 90th percentile estimates for the 2080's and is sourced from the NYC Flood Hazard Mapper. Please refer to the New York City Stormwater Resiliency Plan for more information on the purpose of the study, how datasets were developed, applications for this data, and other details.
A coded value domain is used for the "Flooding_Category" field. See Column Info tab of the Data Dictionary for definition of each code.
The New York City Stormwater Flood Maps show areas of potential flooding of at least 0.25 contiguous acres with flood depths of 4 inches or more. This dataset contains some potential flooding areas less than 0.25 acres due to proximity and overlap with masking layers.