| It has been becoming difficult to construct new dams in Japan due to financial pressure on public works and growing social concerns on the preservation of nature. In addition, suitable sites for dam construction are becoming scarce. For these reasons, it is important to effectively utilize existing dams for flood mitigation and water supply in the future. On the other hand,technical problems related to the modifications for improving existing dams and establishment of discharge facilities are becoming important. Subcommittee for the Research on Effective Use of Existing Dams of Japan Commission on Large Dams (JCOLD) published the report on the examples and trend of effective use of existing dams on 2004. JCOLD subcommittee for the Research on Dam Refreshment was established on 2005 for the purpose of examining technical problems related to the effective use of existing dams mentioned in the previous subcommittee report. Through the research works of the subcommittee for two years, the cases related to designs and construction works for the effective use of existing dams were collected and analyzed. The research works are categorized as follows: a) the raising methods of existing dams, b) improvement works methods of outlet works,and c) reservoir maintenance methods for sedimentation. As a result, problems related to the dam refreshment were pointed out and the methods solving those problems were examined.This paper introduces the “Engineering for raising construction of existing dams.” |
