Abstract
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.
