Studies on flood control techniques of the Tokugawa era have been done from the Meizi period up to the present time. Previous studies concluded that river improvements during those days were conducted by two largest river improvement schools, namely “Kantouryu” and“Kisyuryu”. However, this conclusion and some other conclusions that were obtained through the scarcity of literatures are doubted by recent studies. Besides, these conclusions describe only the policy, and do not, in any way, report the details of flood control techniques during the Tokugawa era.
This study traces the Tokugawa era through written laws promulgated by the Tokugawa Shogunate in connection with flood control techniques. Thus, a thorough investigation of the flood control techniques during the Tokugawa era through these written laws is a primary objective. Results obtained from this study will then be useful in supplementing existing literatures describing flood control techniques of the Tokugawa era.
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