Abstract
Among the water distribution network, we had focused on the maintenance plan of water mains which is vital for distribution system and has a large diameter (400mm or more). In order to maintain the high ability of pipeline facilities, periodic maintenance is required. However, check of pipeline facilities is very difficult, because they are laid in the ground such as hidden. Therefore, reasonable preventive maintenance and management plan should be considered from the view point to prevent the leakage accidents.
In this study, first, we conducted an analysis of the pipeline leakage accident from the past of pipe leakage repair data accumulated in the 23 wards of Tokyo Metropolitan. Furthermore, it was quantified the effects of decreased pressure by water outage by using the distribution network analysis on the main distribution network model. We newly define “the risk index of pipe aging” and “the impact index of supply shortage” from estimated pipe accident rate and insufficient water supply by water outage. We have evaluated the pipeline renewal priority, using these two indicators. As a result, we got a pipeline renewal priority index which reflects not only the laid years of pipes but also the shape of distribution network and the spatial balance of water demand in the water distribution area.
