Sullivan’s Island Home Page

Risk Mapping - Some Links and Information

So I have done a lot in the past, and since I am not one to re-invent the wheel I am going to provide links to those who would like to see how the information provided in the SLR (most specifically) sections are derived.

Rainwater (Pluvial) Flooding

There has been lots of talk of SLR and flooding from storms and Spring tides (King tides). Another aspect of climate change is precipitation increases (or decreases) and how that will affect our present infrastructure. In coastal areas of South Carolina these two aspects of climate change can or could present together to bring on larger changes than when speaking of them separately. As a result, there has been lots of discussion about how the changing climate will affect coastal development and habitats. Most of the time this is focused, for good reason, on the trend towards increased coastal flooding, erosion, and the potential for more damaging storm effects. On a daily basis, however, it is often the constant wetness that causes chronic problems for landowners and the town in certain sections of the island.

Many new homeowners may not be aware of this problem because it is not nearly as easy to define the groundwater depth as the risk of coastal flooding. There are numerous online sites (e.g., NOAA OCM, First Street, Climate Central, etc) that can help define the risk of coastal inundation; there are no known sites (to me anyway) that highlight the depth to groundwater at the same neighborhood-type scale. This exercise/process may help in mapping future risks of prolonged flooding from rain, especially given the trends towards heavier precipitation events.

To learn more about the process used to map the ‘wet areas’ you can follow this link

To see the mapped results of the 2017 and 2057 wet areas in google earth (kmz’s) you can follow this link