• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.126-126
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• 2017

수도권 광역상수도는 관로 매설 이후 30년 이상 경과하여 수도관로 사고 발생빈도가 증가하고 있다. 이에 노후관로를 갱생하여 사고예방과 용수공급 안정성 강화를 도모할 필요가 있으며, 이러한 사업의 수행 여부에 대한 판단을 위해서는 사업 시행으로 발생하는 경제적 편익에 대한 정량적 정보가 필요하다. 노후관로 갱생사업의 경제적 편익은 크게 관로사고 피해저감 편익과 복구비용 절감편익으로 구분되는데 후자는 공학적 접근을 통해 비교적 쉽게 평가할 수 있는 반면에, 전자는 평가가 어렵다. 이에 본 논문에서는 조건부 가치측정법이라는 경제학적 기법을 적용하여 관로사고 피해저감 편익을 추정하고자 한다. 수도권 광역상수도 갱생사업의 수혜지역 주민 600 가구를 무작위로 추출하여 수도권 광역상수도 갱생사업이 시행되지 않을 경우 관로사고가 발생할 수 있음을 설명한 후, 관로사고를 막기 위한 지불의사액을 조사하였다. 분석결과 관로사고 피해 회피를 위한 가구평균 지불의사액은 톤당 약 41.7원이었다. 이 정보는 노후관로 갱생사업에 대한 의사 결정시 활용할 수 있다.

• Journal of Korea Water Resources Association
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• v.36 no.1
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• pp.45-59
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• 2003

The method in this study, which is more efficiency than the existing method, propose the optimal rehabilitation model based on the deterioration prediction of the laying pipe by using the deterioration survey method of the water distribution system. The deterioration prediction model divides the deterioration degree of each pipe into 5 degree by using the probabilistic neural network. Also, the optimal residual durability is estimated by the calculated deterioration degree in each pipe and pipe diameter. The optimal rehabilitation model by integer programming base on the shortest path can calculate a time and cost of maintenance, rehabilitation, and replacement. Also, the model is divided into budget constraint and no budget constraint. Consequently, the model proposed by the study can be utilized as the quantitative method for the management of the water distribution system.

• Journal of Korea Water Resources Association
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• v.44 no.11
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• pp.903-913
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• 2011

In this paper important factors in determining improvement priorities for water pipes were categorized into the effects of a pipe failure to entire pipe network and the characteristics of individual pipe. Subsequently, mathematical models that can quantify these factors were developed using the Fuzzy techniques. The effects of a pipe failure to entire pipe network and the characteristics of individual pipe that were estimated byFuzzy techniques were coined as Fuzzy Importance Index and Fuzzy Characteristic Index, respectively. The Fuzzy Characteristic Index was further categorized into Fuzzy Deterioration Index and Fuzzy Difficulty Index. Considerations were given to applying weights to specific factors in the developed model depending on the circumstances of model applications. To provide an example of the methodology an example pipe network, Net3, of the EPANET program was used. The Fuzzy Importance Index (FII) and Fuzzy Deterioration Index (FDI) were calculated for the Net3 network by considering the hydraulic effects of a pipe failure on the entire pipe network and the pipe deterioration as one of the individual pipe characteristics. Subsequently, the improvement priorities of the pipes in the Net3 pipe network were established based on the FII and FDI.

• Water for future
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• v.29 no.3
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• pp.197-205
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• 1996

Flow carrying capacity of water distribution systems is getting reduced by deterioration of pipes in the systems. The objective of this study is to develop a managerial decision-making model for the rehabilitation of water distribution systems with a minimum cost. The decisions made by the model also satisfy the requirements for the discharge and pressure at demanding nodes in the system. The replacement cost, pipe break repair cost, and pumping cost are considered in the economic evaluation of the decision along with the break ratio and interest ratio to determine the optimal replacement time for each pipe. Then, the hydraulic integrity of the water distribution system is checked for the decision by a pipe network simulator, KYPIPE, if the discharge and pressure requirements, the decision made for the optimal replacement time is revised until the requirements are satisfied. The model is applied to an existing water distribution system, the Metropolita Water Supply Project (1st Phase). The result shows that the decisions for the replacement time determined by the economix analysis are accepted as optimal and the hydraulic integrity of the system is in good condition.