流りゅう域いき治ち水すいMeaningsNoun1. river basin management; river basin flood control; river flood risk reductionKanji used流current (in a fluid)域region治rein in水waterComposed of流りゅう域いきdrainage basin; catchment basin; river basin; watershed; valleyNoun治ち水すいriver management; river improvement; flood controlNoun