Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Development and Applications of a Methodology and Computer Algorithms for Long-term Management of Water Distribution Pipe Systems

상수도 배수관로 시스템의 장기적 유지관리를 위한 방법론과 컴퓨터 알고리즘의 개발 및 적용

  • Park, Suwan (Department of Civil & Environmental Engineering, Pusan National University)
  • 박수완 (부산대학교 사회환경시스템공학부)
  • Received : 2007.03.14
  • Accepted : 2007.04.24
  • Published : 2007.05.30
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Abstract

In this paper a methodology is developed to prioritize replacement of water distribution pipes according to the economical efficiency of replacement and assess the long-term effects of water main replacement policies on water distribution systems. The methodology is implemented with MATLAB to develop a computer algorithm which is used to apply the methodology to a case study water distribution system. A pipe break prediction model is used to estimate future costs of pipe repair and replacement, and the economically optimal replacement time of a pipe is estimated by obtaining the time at which the present worth of the total costs of repair and replacement is minimum. The equation for estimating the present worth of the total cost is modified to reflect the fact that a pipe can be replaced in between of failure events. The results of the analyses show that about 9.5% of the pipes in the case study system is required to be replaced within the planning horizon. Analyses of the yearly pipe replacement requirements for the case study system are provided along with the compositions of the replacement. The effects of water main replacement policies, for which yearly replacement length scenario and yearly replacement budget scenario are used, during a planning horizon are simulated in terms of the predicted number of pipe failures and the saved repair costs.

Keywords

Acknowledgement

Supported by : 부산대학교

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