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 water environment
About class A river
About Kinokawa river
About inundation
About irrigation canal
About Water quality control
About River construction work
About 紀の川
About 水環境
About 概要