Abstract
Most of water supply pipes have constructed in 1960's1970's in Japan, and they are becoming too superannuated. Those aged pipes may cause obstruction and/or decline in water supply performance. Appropriate improvement and renewal in pipe network system is necessary to prevent accidents of water supply performance. Although pipes renewal investment should be balanced both with its effects and revenues on water supply, renewal effects had been insufficiently quantified.
This paper quantifies the effects of renewal in pipe network system, and formulates the scheduling problem to maximize benefits of water supply performance in the planning period under the revenue constraints of water supply. And we propose the new methodology of how to select the target pipes to renew and how to decide the renewal timing, and examine usefulness of this approach.
