About OTSUKA HIDEKI
About 茨城県 農林水産部 農地局
About earthquake disaster
About farm land
About liquefaction(fluidization)
About Ibaraki prefecture
About drainage basin
About river improvement
About land improvement
About history
About part
About civil engineering work
About river channel
About dredged soil
About reclaimed land(filled in ground)
About 稲敷市
About former river
About 屈曲部
About 直線化工事
About Great East Japan Earthquake
About 利根川流域
About Agricultural engineering
About Earth pressure,dynamic properties of soil,stress and deformations of ground
About 茨城
About 周辺
About 農地
About 歴史