A collection of citywide Geographic Information System (GIS) layers that show areas of potential flooding scenarios under varying sea level rise conditions. Please see the New York City Stormwater Resiliency Plan for more information about the methodology applied to develop the maps. Please direct questions or comments to StormwaterResiliency@cityhall.nyc.gov.

This collection contains the following NYC Stormwater Flood Maps:

• NYC Stormwater Flood Map - Extreme Flood (3.66 inches/hr) with 2080 Sea Level Rise
• NYC Stormwater Flood Map - Moderate Flood (2.13 inches/hr) with 2050 Sea Level Rise
• NYC Stormwater Flood Map - Moderate Flood (2.13 inches/hr) with Current Sea Levels
• NYC Stormwater Flood Map - Limited Flood (1.77 inches/hr) with Current Sea Levels

Source Data: http://nyc.gov/stormwater-map

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.

NYC Stormwater Flood Map - Extreme Flood (3.66 inches/hr) with 2080 Sea Level Rise NYC Stormwater Flood Map - Moderate Flood (2.13 inches/hr) with 2050 Sea Level Rise NYC Stormwater Flood Map - Moderate Flood (2.13 inches/hr) with Current Sea Levels NYC Stormwater Flood Map - Limited Flood (1.77 inches/hr) with Current Sea Levels https://www1.nyc.gov/assets/orr/pdf/publications/stormwater-resiliency-plan.pdf Source Data: http://nyc.gov/stormwater-map

These datasets contain the Risk and Equity metrics used to quantify the impact of pluvial flooding in NYC. They are obtained combining several sources (US Census data, New York State Traffic data, etc.) with the NYC Stormwater Flood Map corresponding to an extreme rain event.