When a levee fails, the result can be more catastrophic than if the levee had never been constructed. For that reason, some urban areas in Japan (especially in Tokyo and Osaka) developed a new flood protection known as Super levee. Super levees are thicker levees that will not fail even in the most extreme events. Super levees are failure proof embankments that ensure safety even during a flood larger than the design one. The three main examples describing the safety advantages of Super Levees are: