About YUYAMA YOSHITO
About KINOSHITA YOJIRO
About 北部九州土地改良調査管理事務所
About NAKAMURA KIYOFUMI
About 日本農業集落排水協
About 農業土木学会誌
About alluvial plain (civil engineering)
About Water quality research and measurement in general
About Agricultural engineering
About 農業用水
About 水質保全
About 筑後川
About 下流域
About クリーク
About 水質
About 診断