巨椋低平流域の都市化と内水(11)-内水排除施設計画の最適化-

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  • URBANIZATION EFFECTS ON FLOOD RUNOFF AND INUNDATION CHARACTERISTICS IN OGURA BASIN (11)-OPTIMAL DESIGN OF DRAINAGE SYSTEMS IN OGURA BASIN-
  • オグラ テイヘイ リュウイキ ノ トシカ ト ナイスイ 11 ナイスイ ハイジ

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The Ogura low-lying basin located in the south of Kyoto has been urbanized rapidly in recent years. To cope with changes of flood runoff due to urbanization, the improvement of the River Furu was begun in 1971, and the Kumiyama Pump station with a pump of 30 m^3/s was constructed at the downstream end of the River Furu in 1973. Moreover, a pump of 30 m^3/s was added to this pump station in 1987, and the Joyo Pump station with two pumps of 5 m^3/s was constructed at Haccho located in the upstream of the River Furu in 1990.In addition to these counter-measures, several measures have been proposed in our previous papers. The latest paper showed an optimum plan of drainage systems along the River Furu from the viewpoint of minimum cost of construction.This paper deals continually with an optimum plan of drainage systems in the whole of the Ogura basin which consists of three sub-basins such as the Jodan, the Chudan, and the Gedan Zones from the viewpoint of minimizing a total amount of annual interests, depreciation, and maintenance of drainage equipment. In particular, two counter-measures against the increase of flood runoff due to urbanization in the Nakauchi and Ouchi sub-basins situated in the western part of the Gedan Zone are examined. The one of them is the improvement of existing drainage systems in these sub-basins connected with the Gedan Main Channel through two culverts, and the other is the separation of the drainage systems from the Gedan Main Channel after closing these culverts and constructing the new drainage pump station at the downstream end of the River Ouchi.As the result, it has been clarified that there is little difference in total amount of annual cost of these measures, and that the separating plan has an advantage of reduction of annual flood damage of paddy field in the Gedan Zone.

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