About II HIROYUKI
About 和歌山大 システム工
About 水環境学会誌
About river
About water effluence
About river improvement
About river management
About irrigation canal
About weir
About water quality control
About class A river
About Kinokawa river
About aqueous environment
About inundation
About irrigation canal
About Water quality control
About River construction work
About 紀の川
About 水環境
About 概要