Last January, Jakarta was flooded due to big storms. Used to that kind of situation, the indonesian metropolis is constantly flooded during the rain seasons, running from november to february.
Those rains are at the root of human being deads, large material damages, homeless people, economic standstill, health and polution risks. Facing up this permanent threat, the indonesian authorities decided to implement a Coastal Defense Strategy for Jakarta.
Located north on Java island, Jakarta was built on an extremely flat territory (23 feet, 7 m average).
Studies have shown that the metropolis soil tend to subside about 4 to 8 inches (10 to 20 cm) per year because of heavy urban constructions which make the groundwater sink.
According to the JCDS (Jakarta Defense Strategy) information, 40% of the Jakarta region is under the sea level. At some spots, it has been warmed a subsidence of 13 inches (4,1 m). By ten years from now, the northern capital city will be permantly flooded.
In 2009, a study, driven by the climatologist Armi Susandi at the Bandung Institue of Technology, had warmed national authorities on future flood risks for Jakarta if nothing was done in the 10 following years. With climate change and rising water levels, Armi Susandi had already estimated that a quarter of the capital-city would be flooded in 2050.
The members of the Jakarta Coastal Defense program, still under study, plan to built a wall of 37 miles (60 km) long and 5 miles (8 km) out from the shore between 2014 and 2020.
This whole wall will cover 24 710 acres (10 000 hectares). The project will include retention ponds and pumps designed to remove 500 cubic meters of water per second.
More than just a giant sea wall to protect Jakarta from land flooding, this construction will be part of a large urban masterplan. The wall will be used as a main corridor transport within of which transit will be added. A city of 3 706 acres (1,500 hectares) will be attached to the project.
The Dutch government is actively involved in this project financing the feasibility study of the giant sea wall construction. Their implication is also technical. Taking advantage of world known abilities in coastal land defense, their skills weem to be crucial to make the study succeed. Consequently, the Rotterdam administration is organizing a bid for a project consultant.
To finish, this program will be included in the world coastal cities at risk network that works on substainable solutions in order to protect coastal metropolis from global warming.