I confirmed the MIZUYA·MIZUKA in the Arakawa basin in 13 city and district municipalities from Kumagaya-shi, Saitama to Kita-ku, Tokyo. I was distributed over the basin much in the right bank, and they in particular were located on a natural levee formed of an old river. By the configuration of the premises, traditional policies such as forest or dug were seen other than MIZUYA·MIZUKA. In addition, they placed a ground surface of the premises by the section constitution functionally and coped with a flood by establishing level differences and ground. By the transformation of the space constitution in the premises before and after the modern river improvement business, 3 areas were common, and decrease, extinction of MIZUYA·MIZUKA and forest minded, and an inning of dug was seen. In addition, MIZUYA·MIZUKA which existed was converted not a function as a place of refuge and the storage of preservation as a warehouse. I was able to classify the factor roughly into "the internal environment" such as changes of the inhabitants life and a change of "external environment" such as the river repair work.

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 This study found that was present in 31 river flood prevention by focusing on flood zone spread throughout the country, had been released so far by the Ministry of land, infrastructure and transport 8 rivers of river tradition technology local-architecture initiatives. Also, captured about this flood, flooded water, water in the seedpods that are from the characteristics of the river basin and flood control as the regional initiatives found similarities in each location and architectural initiatives show the specificity of each region. Architectural ingenuity seen parts depending on the heigh and members of the dynamic characteristics have also seen. This is devised to meet than expected inundation, revealed it was in addition, combination of layered flood response. There were architectural ingenuity has been resident behavior in the flood zone are flooding in before the earthquake - disaster - stricken after the cycle of life and recovery as soon as possible to support, to help it.

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