river: river n. 川; 流れ.【動詞＋】ascend a river川をさかのぼるbank a river川に堤防を築くThe river is choked with silt.その川は沈泥で詰まっているclean up a river川を浄化するcontaminate a river with effluents廃水で川を汚染するThe river is crossed by an old
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he surrounded the castle with a moats , with a natural river flow used in some parts of them . 川を天然の堀として利用し、加えて堀を巡らせ守りを固めた。
the moat settlement spanned approximately 200 m across , and while the village was directly facing the natural river on the west side , it was apparently surrounded by a moat of about 20 m wide on the north , east and south sides . この環濠集落の直径が約200メートルで、西側が自然河川に繋がっており、北側と東側、南側には、幅約20メートルの濠が巡っているらしい。
it was completed in 1997 , twenty-five years after the announcement of the plan to construct it , with the following purposes; flood control , the description of specifications and purposes of dams in japan (maintaining the current flow of the katsura-gawa river , and protecting the natural river environment ), and the supply of drinking water to osaka city , kyoto city , kobe city , nishinomiya city , and ashiya city . 洪水調節、日本のダムダム諸元に関する表記（桂川の河川流量を維持し、河川環境を守る）、大阪市・京都市・神戸市・西宮市・芦屋市への上水道供給を目的とし、計画発表から25年後の1997年（平成9年）に完成した。
