NDLI: The Proportional Hazards Modeling of Water Main Failure Data Incorporating the Time-dependent Effects of Covariates

Content Provider	Springer Nature Link
Author	Park, Suwan Jun, Hwandon Agbewosi, Newland Kim, Bong Jae Lim, Kiyoung
Copyright Year	2010
Abstract	Proportional hazards models (PHMs) for the times between consecutive pipe breaks were constructed using case study water main break data. The 150 mm individual cast iron pipes in the case study water distribution system were categorized into seven groups according to the past break history to construct a distinct PHM for each group. During the modeling process the assumption of the proportional hazards of covariates was examined to include the time-dependent effects of covariates on the failure hazard in the models. By analyzing the baseline hazard rates, the hazards of the third through the seventh break were found to follow a form similar to a bath-tub. The estimated regression coefficients and the hazard ratios of the selected covariates were used to analyze the variations in the factors and their effects, including the time-dependent effects on the pipe failures. The changes in the relative hazards of the covariates were also analyzed according to the number of breaks. The constructed PHMs were verified by analyzing the deviance residuals of each model.
Starting Page	1
Ending Page	19
Page Count	19
File Format	PDF
ISSN	09204741
Journal	Water Resources Management
Volume Number	25
Issue Number	1
e-ISSN	15731650
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-06-18
Publisher Institution	European Water Resources Association (EWRA)
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hazard rates Pipe break Proportional hazards model Consecutive breaks Time-dependent effects of covariates Water main Environment Civil Engineering Meteorology/Climatology Geotechnical Engineering Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Water Science and Technology Civil and Structural Engineering

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