抄録
The “Historical Curvilinear Oblique Weir” was built by Kenzan Nonaka in the Edo era. The shape of those weirs is unique and different from which made in the modern period, some weirs are remaining in Kochi prefecture. By the investigation and analysis of the location of these weirs, I tried to make a hypothesis that is different from the previous one about the design principle of the weir.
In this unique design principle, there is the opinion that it was built along the edge line of the sand bar. On the other hand, there is also a tradition of having been built by the technique of “ito-nagashi” in local Kochi. However, neither of the opinions explains enough about the shape of the weir. The hypothesis shown by this research is, “the weir was built crossing the run where the stabilized height of the river was located, and had a sluice gate in the deep pool of the river.” and I think that it has higher valid than the existing one.
