HighWaterLine Delray Beach Elevation Map with Chalk Line Route by Dr. Keren Bolter
South Florida is vulnerable to sea level rise from climate change, due to its generally low elevation
The HighWaterLine elevation map illustrates this vulnerability in 3 districts in Delray Beach:
- The Nassau Historic District is east of the intracoastal waterway and marked by the black line.
- The Marina Historic District is west of the intracoastal waterway and marked by a black line.
Both districts are between 2 and 6 feet elevation and have been subject to flooding from the intracoastal. In the future, as the seas continue to rise, along with high tides, storm surge and extreme weather (some of the consequences of climate change), the flooding will occur more often.
- Frog Alley is the district further west on the map. The elevation around the black line is between 12 and 16 feet. The depth to the groundwater in this area is about 7 feet. For every foot the sea level rises, the groundwater will be lifted one foot closer to the surface, which reduces the storage available underground.
The City of Delray Beach is responding to flooding in these 3 districts:
- In the Nassau Historic District, water containers have been installed underground to collect excess water. Pumps help alleviate flooding more quickly.
- In the Marina Historic District, the City is adapting the drainage outfalls with tide valves to stop the intracoastal waterway from entering the drainage system when there is a high tide.
- In Frog Alley, the City has constructed retention areas to store stormwater and reduce street flooding.
In the future, with rising waters predicted, more will need to be done.