Protecting river control structures against earthquake and tsunami
Based on lessons learned from the Great East Japan Earthquake of March 2011, the TMG compiled in August 2012 its basic policy on protecting infrastructure in lowland areas of eastern Tokyo against floods from earthquakes/tsunami. This aims to maintain the functions of each structure and prevent inundation from tsunami, etc. even in the event of the biggest earthquake predicted. The policy states that the TMG will take measures to protect embankments, floodgates and other structures against earthquakes and to improve the water resistance of pumping stations and other facilities in case they are flooded.
In December 2012, the Bureau developed a plan for improving river control structures, which includes specifics such as target facilities and construction period. Based on this plan, work began in fiscal 2012, with an eye to completing works on structures that urgently need to be fortified by 2020 (fiscal 2019).
The Bureau will continue efforts to quickly enhance the safety of the lowland areas.