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How do sea walls and flood-control projects protect low-lying parts of Shanghai?
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Shanghai
Skyline of Shanghai, China.
Shanghai is situated on a low-lying deltaic plain with an average elevation of only 10 to 16 feet above sea level, making the city vulnerable to tidal inundation.1
To mitigate these risks, the city has implemented significant public works projects:
- Sea Walls: The existing sea walls surrounding the city have been systematically strengthened and enlarged to provide a robust barrier against the sea. Notably, two major sea walls extend east of the Huangpu River for a combined length exceeding 13 miles.2
- Flood Walls: In specific low-lying areas that are particularly susceptible to tidal flooding, authorities have constructed dedicated flood walls to protect urban infrastructure and residential zones.2
- Drainage Improvements: These structural defenses are complemented by modern improvements to the city's drainage and sewage-treatment facilities, which help manage water levels and prevent flooding within the municipality.2