In Jakarta, that sinking feeling is all too real

Bill Tarrant at the Thomson Reuters Foundation via Reuters: …"Jakarta is a bowl, and the bowl is sinking," said Fook Chuan Eng, senior water and sanitation specialist with the World Bank, who oversees a $189 million flood mitigation project for the city.

The channels of the Ciliwung and other rivers are sinking. The entire sprawl of Jakarta's north coast - fishing ports, boatyards, markets, warehouses, fish farms, crowded slums and exclusive gated communities - it's all sinking. Even the 40-year-old seawall that is supposed to keep the Java Sea from inundating the Indonesian capital is sinking.

…Flooding from overflowing rivers and canals in the area is at least an annual event that forces Rahmawati and the rest of the kampong to evacuate to public buildings nearby. High-water marks from the last big flood, in 2013, are still visible on the walls of the kampong.

Jakarta is sinking because of a phenomenon called subsidence. This happens when extraction of groundwater causes layers of rock and sediment to slowly pancake on top of each other.

The problem is particularly acute in Jakarta because most of its millions of residents suck water through wells that tap shallow underground aquifers. Wells also provide about a third of the needs of business and industry, according to city data….

Jakarta's skyline, shot by Vian kadal, Wikimedia Commons,  under the Creative Commons Attribution-Share Alike 3.0 Unported license