2022 Volume 77 Issue 5 Pages I_1-I_8
It can be said that modern times was a process in which the existed equilibrium in the management system of social infrastructure facilities was collapsed, and a new equilibrium was gradually formed while seeking cooperations. The water system in the Gi-Toh area had been flexibly formed for about 20 years, from river improvement to land improvement projects, and the construction of modern sewerage systems based on them. In the process of forming these series of systems, engineers often presented a vision that transcended the existed field of view, which was believed technically possible. The plan perfectly drawn to completion was denied at the beginning, and the feasibility was guaranteed by the method of making a plan that allowed correction and expansion. It can be said that the actual system had been flexibly constructed while keeping the same field of perspective. And although the division of duties of each organization had been clarified in modern times, there was a system supported by a human network that enabled collaboration while sharing this huge project.
