Document Type



Virginia Institute of Marine Science

VIMS Department/Program

Center for Coastal Resources Management (CCRM)

Publication Date


Data Access

Eastern Shore, Middle Peninsula, and Northern Virginia localities in a zipped file under the download tab.

Peninsula and Southside localities are in a zipped file under the Additional files section.


Geospatial layers displaying annual flooding duration in the coastal zone of Virginia. These were generated from publicly available historical hourly tidal data from the NOAA Tides and Currents website from various tide gauges in the Chesapeake Bay region for the last 20 years. Particular tide gauges were linked to specific localities depending on location. The data was processed to determine average annual flooding duration at various flooding levels. Flood levels corresponding to specified average annual duration levels were then determined and used with lidar-derived digital elevation models to extract flood areas corresponding to the specified ranges of flood duration. Specifically, coastal flood areas corresponding to 0 - 5 hours, 5 - 100 hours, 100 - 200 hours, > 200 hours of annual flood duration were extracted. These time ranges are coded as 1, 2, 3, 4, respectively, in the flood duration rasters.

In addition to present day flooding, projected flooding was considered for future years 2050, 2100 using the Intermediate-High scenario from the 2017 NOAA Technical Report. The values were adjusted for regional subsidence. Sea level rise values of 0.457 meters and 1.280 meters were used, respectively, for 2050 and 2100. These values were added to the water levels in the tidal data to derive new frequency flooding results for 2050 and 2100.

Locality data is grouped into regions.


Data is in raster form in file geodatabases, readable by ESRI ArcGIS Pro/ArcMap software.

Data collection methods: Data acquisition and methodology are described in the metadata (embedded in the shapefile).

File | Description

  • EasternShore: Rasters within a File geodatabase – embedded metadata
  • MiddlePeninsula: Rasters within a File geodatabase – embedded metadata
  • NorthernVa: Rasters within a File geodatabase – embedded metadata
  • Peninsula: Rasters within a File geodatabase – embedded metadata
  • Southside: Rasters within a File geodatabase – embedded metadata



Coastal flooding, sea level rise

Associated Publications

Mitchell, Molly; Hendricks, Jessica; Schatt, Daniel; and Berman, Marcia, "Road accessibility from county seat under flooding: Hampton, Newport News, James City, Poquoson, Williamsburg, York, Accomack, Northampton, Alexandria, Fairfax, Gloucester, Mathews, Middlesex" (2021). Data. William & Mary.


This project, Task #92.01 was funded in part by the Virginia Coastal Zone Management Program at the Department of Environmental Quality through Grant FY2019 #NA19NOS4190163 of the U.S. Department of Commerce, National Oceanic and Atmospheric Administration, under the Coastal Zone Management Act of 1972, as amended. (276064 kB)
Peninsula and Southside localities