雨水利用システムにおける雨水利用効率と都市型洪水防止効果の検討 : 福岡市の戸建て住宅を事例として  [in Japanese] RAIN WATER USAGE EFFECIENCY AND FLOOD CONTROL EFFECT IN RAIN WATER USAGE SYSTEM : A case study of detached dwellings in Fukuoka city  [in Japanese]

This paper develops the efficiency of rainwater usage system in detached dwelling by carrying out the numerical simulation with hourly water consumption and hourly rainfall in Fukuoka city, with considering water usage and human life cycle. From there, we indicate the beneficial efficiency of small rainwater usage system with showing the three rainwater usage efficiency indexes and one flood control index, the reduction number. Moreover, considering the relations among the four indexes, we show the rate of effective usage and the reduction number having the same content and the difference between the rate of alternation and the yield of cistern.,