The suggestion about ways of protection for flood exceeding the designed level in the eastern part of Tokyo Lowland（below sea level area）. The East Tokyo inundation area will be seriously damaged if once the dyke is destroyed because there is densely populated with highly economically activated. In order to increase the safety against the flood, super dyke would be the most effective countermeasure, which aims to achieve the protection of dyke from the excessive flood. The super dyke would be enough strong for the excessive flood and seepage failure as the width would be 30 times of its height. At the same time, this dyke with soil improvements against liquefaction could be enough strong for the earthquake and would be possible to protect the low land below sea level from flood. Furtherer more, the dyke could produce the safe high land as an evacuation area to protect human lives and properties from flood and high tide. From these characteristics, the main effectiveness and objective of the super dyke can keep the evacuation area for the citizens in the east lowlands in Tokyo. Nakagawa river is the most urgent area to equip the super dyke among East Tokyo basin because it is located at the lowest elevation with highly dense populations. Therefore, the author would like to propose to Arakawa river let to increase flood through capacity enough to use the space of Nakagawa for construction the super dyke. This plan would be the only way to protect human life and properties in Edogawa district from the coming excessive flood and high tide.
食料の多くを海外からの輸入に頼っている日本は，世界各国が気候変動によって蒙る様々な影響と無縁ではない。本研究は，気候変動による世界の水資源量と食料生産への影響推計モデルを作成し，世界の水の安全保障の観点から我が国の技術的な貢献の在り方について検討することを目的とするものである。 本推計モデルによると，2000年に対する2050年の生活用水需要量は3. 07倍，工業用水需要量は1. 67倍と大きく増加し，大規模な水資源開発が必要であることが明らかとなった。同時に，日本が誇る水再生技術を導入すれば工業用水の需要量の削減に大きな効果を有していることを確認することができた。