Technology and Engineering
  • ISSN: 2333-2581
  • Modern Environmental Science and Engineering

Examination of DIP Accident Rate Estimation Formula by Logistic Regression

Takaharu Kunizane1, Akira Koizumi1, Toyono Inakazu1, Yasuhiro Arai1, Tetsuji Shitabo2, and Katsuya Osada2

1. Faculty of Urban Environmental Sciences, Division of Civil and Environmental Engineering, Tokyo Metropolitan University, Japan

2. Japan Water Research Center, Toranomon Denki Bldg, 2-8-1, Toranomon, Minato-ku, Tokyo, Japan



Abstract: An industry-government-academia joint study was conducted for three years (2008-2010) to explore research focused towards pipeline technology for sustainable drinking water services (e-Pipe project). As a result, new estimating equations for the pipeline accident rate were proposed to calculate the age and type of the pipe and ground condition. These equations were prepared via results derived from questionnaire surveys (2004-2007) that the Japan Water Research Center conducted for water supply utilities about leak accidents from pipelines. These equations have been widely used at sites for maintenance of pipeline utilities aiming toward leakage prevention. However, continuing investigations are required, as well as the validation of the accuracy of the estimating equations, as they were derived from water leak accident data consisting of only a four-year period. In this study, the aim was focused towards adding data from the questionnaire survey that focused on the water leak accidents that occurred in 2008 and 2009, and to recalculate the estimating equations for the pipeline accident rates proposed by the e-Pipe project.



 Key words: distribution pipelines, leakage accident, logistic curve


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