Super levees along the Arakawa River in Tokyo

A super levee is a high river embankment with a broad width which can withstand overflow. The concept of a super levee is designed especially for extreme events in dense urban areas. These levees are build in order to prevent catastrophic damage due to dyke breach in low-lying highly urbanized areas, such as Tokyo and Osaka.

On the Sumidagawa and other major rivers, super levees and gently sloping embankments are being constructed to make the areas better protected against a potential strong earthquake and to improve the riverside environment. Construction is carried out in an integrated manner with redevelopment and other community development projects in areas along the rivers. Also, terraces are built before the completion of levees/embankments to allow the public to enjoy jogging and strolling in waterfront areas.