Connecticut Flood Maps for Different Storm Return Intervals

Brief Description | Dataset Content | Temporal Coverage | Spatial Coverage | Update Schedule | Usage Restrictions | Detailed Description | Documentation | Related File Naming & Structure Information | Download | Citation | Contact | Disclaimer

Brief Description:

The projected maps of the annual exceedance probability of storm surge water levels from FVCOM-SWAVE model.

Dataset Content:

GIS map files for different return interval flood maps and added 20 inc sea level rise. The return period of the storms are 10, 30, 100, and 500 year.

Temporal Coverage:

Results covers the simulation of highest 44 storms between 1950-2018.

Spatial Coverage:

Individual 24 locations of the grid points for towns are mapped to topographic data.

Update Schedule:

• Recently updated on May 15, 2020.
• Next update: Fall 2020

Usage Restrictions:


Detailed Description:

The maps represent the modeled Long Island Sound using a coupled coastal circulation and wave model (FVCOM-SWAVE) and hindcast the highest 44 storms between 1950-2018. The dataset contains the empirical probability results that fit Poisson-GPD distribution. The storm surge water level for the specific event annual exceedance probability is provided for 24 Connecticut coastal towns are selected and project to 2016 LIDAR topographic data with 1 m spatial resolution.


Please read the journal article to learn more about the methodology (Link to the article)

Related File Naming & Structure Information:

Dataset Format and Size:
• The data size is less than 100 MB
• The file includes GIS files with layer packages.
• No missing data.


Storm Surge FloodMaps-CT


For dataset source, please cite: Massidda, C., Liu, C., Jia, Y., Onat, Y., Cifuentes-Lorenzen, A., Ilia, A., McCardell, G., Fake, T. and O’Donnell, J. (2020) Connecticut Flood Maps for Different Storm Return Intervals, (v.1), [GIS], University of Connecticut, Connecticut Institute for Resilience and Climate Adaptation, Retrieved from

Please note: If you acquire any data products from CIRCA, we ask that you acknowledge us in your use of the data. This may be done by including text such as “The data is provided by the UConn CIRCA, Connecticut, USA OR By citing the dataset in any documents or publications using these data.
We would also appreciate receiving a copy of the relevant publications. This will help us to justify keeping the data set freely available online in the future. Thank you!


Data Disclaimer:

This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the sole responsibility of the user. Attempts have been made to ensure that this data or documentation is accurate and reliable; The University of Connecticut, nor the Department of Marine Sciences, does not assume liability for any damages caused by inaccuracies in this data or documentation, or as a result of the failure of the data or software to function in a particular manner. The University of Connecticut, nor the CIRCA, makes no warranty, expressed or implied, as to the accuracy, completeness, or utility of this information, nor does the fact of distribution constitute a warranty.