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Everything Everywhere Daily

The World's Worst Located Cities

15 min episode · 2 min read

Episode

15 min

Read time

2 min

AI-Generated Summary

Key Takeaways

  • Urban Subsidence Rates: New Orleans sinks 5–6mm annually on average, with some neighborhoods dropping 20–30mm per year due to drained wetland soils compressing under infrastructure weight. At current rates, certain districts may become economically indefensible to protect within decades.
  • Mexico City Soil Amplification: Built on drained Lake Texcoco sediments, Mexico City sinks up to 50cm per year in worst-affected zones. The same soft clay amplifies distant earthquake waves like gelatin, explaining why the 1985 earthquake caused catastrophic damage despite its epicenter being hundreds of miles away.
  • Groundwater Pumping Consequences: Jakarta's severe subsidence was driven largely by residents pumping private groundwater wells due to inadequate piped water infrastructure. This single practice caused northern districts to sink below sea level, compounding flood risk enough that Indonesia decided to relocate its entire national capital to Borneo.
  • Tehran Water Crisis Timeline: Tehran's reservoirs reached critically low levels by late 2025, with neighborhoods experiencing pressure cuts. Overbuilt dams, subsidized water pricing, and groundwater over-extraction have depleted aquifers faster than recharge, simultaneously causing subsidence and random sinkholes that swallow buildings and streets.

What It Covers

Four major world cities — New Orleans, Mexico City, Jakarta, and Tehran — share a critical geological flaw: all are actively sinking due to water mismanagement, soil compression, and drainage decisions made centuries before modern urban growth.

Key Questions Answered

  • Urban Subsidence Rates: New Orleans sinks 5–6mm annually on average, with some neighborhoods dropping 20–30mm per year due to drained wetland soils compressing under infrastructure weight. At current rates, certain districts may become economically indefensible to protect within decades.
  • Mexico City Soil Amplification: Built on drained Lake Texcoco sediments, Mexico City sinks up to 50cm per year in worst-affected zones. The same soft clay amplifies distant earthquake waves like gelatin, explaining why the 1985 earthquake caused catastrophic damage despite its epicenter being hundreds of miles away.
  • Groundwater Pumping Consequences: Jakarta's severe subsidence was driven largely by residents pumping private groundwater wells due to inadequate piped water infrastructure. This single practice caused northern districts to sink below sea level, compounding flood risk enough that Indonesia decided to relocate its entire national capital to Borneo.
  • Tehran Water Crisis Timeline: Tehran's reservoirs reached critically low levels by late 2025, with neighborhoods experiencing pressure cuts. Overbuilt dams, subsidized water pricing, and groundwater over-extraction have depleted aquifers faster than recharge, simultaneously causing subsidence and random sinkholes that swallow buildings and streets.

Notable Moment

Tehran faces a dual crisis unique among the four cities: groundwater depletion causes both land subsidence and sudden sinkholes that randomly collapse entire buildings, while pre-weakened infrastructure means even moderate earthquakes could trigger disproportionate urban destruction.

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