About YOSHITANI JUN'ICHI
About river
About Nagano prefecture
About river levee
About flood
About flood damage
About tectonic forms
About river environment
About river management
About amount of precipitation
About river improvement
About farm land
About catchment area
About ecology(science)
About civil engineering history
About stream ecology
About Shinanogawa River
About Chikumagawa River
About flood
About Flood prevention measures
About Nature conservation
About 地域
About 河川整備
About 信濃川
About 水系
About 長野
About 治水
About 歴史
About 水環境