Matsushita J, Ozaki M, Nishimura S, Ohgaki S
Department of Systems Engineering, Shibaura Institute of Technology, Fukasaku, Saitama, Japan.
Water Sci Technol. 2001;44(2-3):295-303.
The Urban Development Corporation (UDC) is one of the biggest implementation bodies for urban development in Japan. UDC has developed rainwater infiltration technology since 1975. This technology has effectively reduced runoff to a river and sewer system in the new town project areas. Recently, UDC has developed a new system which is defined as a "Rainwater Recycle Sewer System", which is supported by "Rainwater Storage and Infiltration Technology (RSIT)" applicable to new town creation and urban renewal. The new system consists of two elements: RSIT components based on Public-Private Partnership (PPP) and a stormwater drainage system. Herein, the private sector is responsible for the main part of RSIT, and the public sector is responsible for the stormwater drainage from the development area. As a result, the capacity of public facilities, such as rainwater sewers and stormwater reservoirs, can be reduced effectively. In parallel, the initial/running cost of public facilities is expected to be reduced. In conclusion, the authors would stress the importance of a co-maintenance system also based on PPP, which will be required especially in order to properly operate the whole system for the long term.
城市开发公社（UDC）是日本最大的城市开发实施机构之一。自1975年以来，UDC一直在研发雨水渗透技术。这项技术在新城镇项目区域有效减少了流入河流和下水道系统的径流量。最近，UDC开发了一种新系统，被定义为“雨水循环下水道系统”，该系统由适用于新城镇建设和城市更新的“雨水储存与渗透技术（RSIT）”提供支持。新系统由两个部分组成：基于公私合营（PPP）的RSIT组件和雨水排水系统。在此，私营部门负责RSIT的主要部分，公共部门负责开发区的雨水排放。因此，可以有效降低雨水下水道和雨水蓄水池等公共设施的容量。同时，预计公共设施的初始/运营成本也会降低。总之，作者强调基于公私合营的共同维护系统的重要性，特别是为了长期妥善运营整个系统，这是非常必要的。
