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Later, the data, which was accessible by the community and the general public, was used in 2011/2012 Jakarta contingency emergency planning exercise. The risk information it produced was very useful for decision makers in preparedness, development and investment planning. [43] Petabencana.id can now be consulted and it contains a flood map.
Jakarta lies on a low flat basin 23 feet (7 m) above sea level. 40 percent of that, particularly the northern areas, is below sea level. Given the continuous groundwater extraction and the pressure of skyscraper developments, Jakarta is sinking at 5 to 10 centimeters per year, up to 20 centimeters.
Floods have hit Jakarta several times in the past, including in 1621, 1654, 1918, 1942, 1976, 1996, 2002, 2007, 2013 and 2015. A significant contributing factor is that a substantial part of Jakarta is low-lying; some 24,000 ha (240 km 2) of the main part of Jakarta are below sea level. [6]
Severe floods have been reported to have hit Jakarta in the past, including in 1621, 1654, 1918, 1942, 1976, 1996, 2002 and 2007. An important part of the flooding problem is caused by the fact that a substantial part of Jakarta is low-lying. Around 24,000 ha (about 240 square km) of the main part of Jakarta is estimated to be below sea level. [2]
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The mean sea level rise globally was 3–10 mm per year, while the subsidence rate for Jakarta was around 75–100 mm per year, making the relative rise in sea level nearly 10 cm per year. [39] Continued carbon emissions at the 2019 rate, in combination with unlicensed groundwater extraction, is predicted to immerse 95% of Northern Jakarta by 2050.
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The 2007 Jakarta flood was a major flood in Jakarta, the capital of Indonesia and affected several other areas around the city, such as West Java and Banten. The flood, beginning on February 2, 2007 was a result of heavy rain, deforestation in areas south of the city, and waterways clogged with debris. [ 2 ]