巨椋低平流域の都市化と内水(10)-古川を中心とした内水排除施設-

Abstract

The Ogura low-lying basin located in the south of Kyoto has been urbanized rapidly in recent years.In this basin, several counter-measures against changes of flood runoff due to urbanization have been completed or are continueing, such as the construction of the Kumiyama Pump Station with a pump of 30m^3/s in 1973 and the channel improvements to the River Furu since 1971. Moreover, a pump of 30m^3/s was added at the Kumiyama Pump Station in 1987 and the Jouyou Pump Station with the drainage capacity of 10 m^3/s composed of two pumps of 5 m^3/s, was constructed at a point of the upper stream of the River Furu in 1990.In the previous paper, we discussed an optimum plan of drainage system from the viewpoint of minimum cost of costruction, on the basis of drainage conditions in 1960.This paper deals continually with an optimum plan of drainage system in future on the basis of the present condition of drainage system.As the result, it has been clarified that the optimum plan of drainage system in future is the combination of the improvement of channels and the increase of pump capacities at the existing pump stations, and that the construction of new drainage equipments become difficult because mainly of high price of lands.