A city already 40% below sea level faces torrential rain and flooding in the first days of 2020. Jakarta, Indonesia is a metropolitan area of around 30 million people. Land around the city is subsiding from overuse of pumping of underground water. Floodwaters do not drain into the sea as is normal. Walls protect the parts of the city that are below sea level.
During heavy rain the water from upland areas comes down to Jakarta further overwhelming a poor drainage canal system.
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