Study on Outlet Form and History of Development in Flooday

Abstract

Abstract:This paper describe the characteristics of the floodways in Japan through the history of their development . The object channels are 327 that the all floodways to be called in Japan today . A research adopts the method that inspects the attribute of the floodway individually in the outlet form, the diversion structure and the development year etc . As the second step, the correlation of each attribute had been considered. As a result , it was found that the Otozu River is oldest in the history of the floodway development, in the channels that discharges only flood that exist .