1990年19号台風による洪水災害-兵庫・滋賀県下を中心として-

Abstract

On September 18 through 20 of 1990, a heavy rainfall associated with an autumn rain front and the Typhoon No. 19 caused substantial damages throughout Japan, actually involving 40 out of 47 prefectures.Forty-one people were killed. About 41, 000 houses were inundated, 520 being fully and partially destroyed.The amount of damaged public construction works were estimated about 335 billion yen.The number of damaged construction works in the prefectures was compared with total and hourly maximum rainfalls, and, similarly, the number of inundated houses with these rainfall data.Being in excess of 300 mm for a total and 40 mm for an hourly rainfall, the number of damaged construcion works are preciously increased. On the other hand, the critical values of total and hourly rain-falls for the inundated houses are a little less than those for the construction works, and show the regional characteristics of climate and vulnerability for floodings.In respect to Hyogo and Shiga prefectures, rainfall distributions in time and space were discussed, comparing with damages to river structures and houses in their administrative districts.The serious inundation in Toyooka city of Hyogo due to stagnation of rainwater was described in comparison with records of the past major floods in the Maruyama river, refering to the drainage system.The flooding and sedimentation in Notogawa town of Shiga due to levee failures in the Echi river were examined based on estimation of the flood discharge and the coveyance capacity of the river channel with luxuriant coppices.