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Service Description: Inundation surfaces that highlight areas of possible concern for different Sea Level Rise (SLR) scenarios. Flood surfaces were created for the following scenarios: Mean Higher High Water (MHHW) plus 1’ Sea Level Rise (SLR) MHHW plus 3’ SLR MHHW plus 1’ SLR and 3’ storm surge MHHW plus 5’ SLR Hurricane of ’38 flood levels in Newport, RI

All elevation values reference NAVD88. The Hurricane of 1938 flooding was estimated using an 9.46 foot surge above MHHW, which was the maximum recorded value at the Newport Tide station. This is estimated to be similar to the FEMA "100-year storm”. Sea Level Rise (SLR) scenarios were based on the current CRMC policy which accommodates a 3 to 5 foot rise by 2100 and are illustrated at 1’, 3’ and 5’ intervals. These elevation estimates are based on real data and are not a model.

Caveats: Inundation zones were created using single-value “bathtub” analyses, where the water level rises without detailed modeling or changes in topography. Inland hollows and other lowland areas maybe be seen as flooded, whereas they may not be connected to the sea and affected by the sea level rise. All flood surfaces are for general planning purposes only. They are very useful for highlighting vulnerabilities, but could vary widely from the results of an actual event. It is expected that these maps will be used in conjunction with expert local knowledge to refine the exposure risks.

DISCLAIMER: Sea Level Rise (SLR) map services are for reference only. The user of this information understands and acknowledges that the data may be inaccurate or contain errors or omissions and the user assumes full responsibility for any risks or damages resulting from any use of or reliance upon this data. The University of Rhode Island's Environmental Data Center does not guarantee the accuracy or reliability of the data generated from this service. The user of this information should always consult official FEMA Flood Insurance Rate Maps and certified elevation data if there is any doubt of flood risk.

Map Name: Sea Level Rise Scenarios

Legend

All Layers and Tables

Layers:

• MHHW Plus 1' SLR and 3' Surge (0)

Description:

Copyright Text: Rhode Island Sea Grant; University of Rhode Island Environmental Data Center (URIEDC); RI Division of Planning; RI CRMC

Spatial Reference: 102100  (3857)


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Document Info:

Title: Rhode Island Inundation Scenarios Developed from a LiDAR-Derived Elevation Model
Author: CDamon (URIEDC)
Comments: This work sought to compile the best-available elevation and bathymetry data for the state, then construct a new, continuous topographic/bathymetric digital elevation model (DEM). These combined data would generate a much more useful picture of the coastal environment, allowing for better coastal hazards planning along with the more traditional upland uses. In addition to the DEM both a hillshade and 2, 5, and 10-foot contour datasets were developed. These products are in high demand for effective visualization and analysis, and create a complete elevation product package for the state that can then be used for evaluating coastal hazards.
Subject: Inundation surfaces that highlight areas of possible concern for different Sea Level Rise (SLR) scenarios. All flood surfaces build upon mean higher-high water.
Category:
Keywords: SLR,sea level rise,inundation,climate change,RI,RhodeIsland,RhodeIslandDigitalAtlas,RIGIS,URIEDC
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