都市化と内水

Abstract

We have carried on the hydrological investigation since 1966 in the Ogura basin located in the south of Kyoto, in order to clarify the urbanization effects on floodrunoff and flood disaster potentialities. This report is a summary of the research delivered as the last lecture at Disaster Prevention Research Institute, Kyoto University.This report is composed of the following contents.1) Flood disaster potentialities increase with the progress of urbanization. To cope with the urbanization in the upper area of the river Furu, the improvement of the river Furu become urgent.2) The impact of arterial roads concentration forecasted in the Ogura basin is caused by the construction of attached facilities such as gas stations, restaurants and so on. The construction of the attached facilities must be restricted severely in a low-lying basin.3) Extreme urbanization of a low-lying area may be obliged to construct a new drainage system because of the limit of the improvement of existing system.4) The result of DP calculation shows that the present drainage system is near to an optimal one, but that the system with several pump stations along the river Furu may become optimal if the land cost goes up and the channel improvement become expensive.