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Nishi-Tokyo-shi, Japan

Suzuki Y.,Japan Water Research Center | Adachi W.,Japan Water Research Center | Amano M.,Nippon Jogesuido Sekkei Co. | Fujiwara M.,Nippon Jogesuido Sekkei Co.
Journal of Water Supply: Research and Technology - AQUA | Year: 2014

In Japan, many drinking water systems were developed during the 1960s and 1970s, and a considerable proportion of them is now showing various signs of aging or seismic vulnerability. The major issue for many drinking water utilities is how to update those facilities in the best way to improve their deteriorating/insufficient performance. The existing performance assessment methods for water supply facilities need relatively high technical knowledge and they are only applicable to evaluate individual facilities. The Japan Water Research Center (JWRC) has thus developed a performance assessment method for drinking water infrastructure which requires no special technical investigation or a complicated calculation. Thus, staff of small- and medium-scale drinking water utilities can easily carry out logical function evaluation for their facilities using performance indices and answering questions on daily operation and maintenance. This development is part of the e-Pipe research project that was conducted at JWRC from 2008 through 2010 with Health and Labour Sciences Research Grants from the Ministry of Health, Labour and Welfare. © IWA Publishing 2014. Source

Hayashi K.,Nippon Jogesuido Sekkei Co. | Ohtake K.,Nippon Jogesuido Sekkei Co. | Baba K.,Nippon Jogesuido Sekkei Co. | Suto T.,Nippon Jogesuido Sekkei Co. | Yoshikawa H.,Tokyo City University
Journal of Water Supply: Research and Technology - AQUA | Year: 2014

In Japan, earthquake resistance improvement (earthquake proofing) of drinking water infrastructure is not as developed as for other types of infrastructure such as gas and electricity. To facilitate earthquake proofing, it is important for water utilities to encourage customers to better understand its importance and effectiveness. So that water consumers could instinctively understand the effectiveness of earthquake proofing, we applied the concept of 'recovery time expectancy' as an indicator of earthquake resistance of water treatment plants. In this study, we performed a recovery simulation of a medium-scale water treatment plant based on the system reliability theory, and then evaluated the effectiveness of earthquake proofing using recovery time expectancy as an indicator. The simulation was performed with five cases: the present condition of the facility and four hypothetical cases with different levels of earthquake proofing. As a result, the effectiveness of earthquake proofing was able to be expressed by a recovery curve showing the reduction of recovery time expectancy, and the priority became clear for seismically proofing each component of the plant according to the earthquake scale. Finally, the optimum capital investment was determined by comparing total costs (damage cost plus investment cost) of the five cases, which were computed according to recovery time expectancy after earthquake proofing. © IWA Publishing 2014. Source

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