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。
both yura-gawa and yohoro-gawa river flow through maizuru city , with 1 ,620 ha of accompanying land area used for agriculture which comprises 4 .7% of the total area . 舞鶴市は由良川と与保呂川をもち、市の耕作に用いられる土地は全体の4.7％の1,620haである。
however , it was decided that tramlines would be laid out in areas where no other means would be available , tramlines were planned to be laid out that started from the field practice forest administration building and reach to nakayama along the river flow in the headwaters area of the yura-gawa river . しかし、やむをえない場所については軌道で整備されることとなり、演習林事務所から由良川源流に沿って中山に至る区間に軌道を敷設することが計画された。
after that he also carried out the work to level the uemachi plateau and construct a channel in order to make yamato-gawa river flow directly into the osaka bay , but his attempt failed (it is said that kawazoko-ike pond situated in the premise of chausuyama tumulus (osaka ), in tennoji ward , osaka city is a remain of this failed project and there is a bridge called ' wake-bashi bridge .' ) その後、に上町台地を開削して大和川を直接大阪湾に注ぐ工事を行ったが失敗している（大阪市天王寺区の茶臼山古墳 (大阪市)にある河底池はその名残りとされ、「和気橋」という名称の橋がある）。
