Delaware Sea Level Rise Inundation Maps

Delaware's Department of Natural Resources and Environmental Control (DNREC) and the scientists from Delaware Coastal Programs have developed Sea Level Rise (SLR) inundation maps for the state as an online interactive tool. The maps show the possible impacts of inundation based on various SLR scenarios for Delaware’s waterways and watersheds. The scenarios available include .5, 1.0, and 1.5 meter SLR projections that can be viewed at a large statewide scale, detailed street level images, or focused in between, by entering an appropriate address. The maps are a representation of inundation based on local Mean Higher High Water (MHHW), which is the long‐term average of the higher of the daily high tides. The maps represent a constant, watershed based, water level and do not include any changes in water level due to the distance from tidal forcing, downstream flow, or other factors which could possibly change water levels.

The coast of Delaware encompasses 381 miles of shoreline, including the 24 miles that front the Atlantic Ocean, with barrier beaches, inland bays, small islands, and highly productive estuaries, marshes, and tidal flats. Potential effects from SLR include inundation of wetlands and other low-lying lands, erosion of beaches, intensified flooding, and increased salinity of rivers, bays, and groundwater tables. Storm surge becomes a threat to high-valued property located along the coast of Delaware as sea level rises as well.

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  • Mapping tool

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