Optimal management planning model of water suspension risk in water supply system

In step with rapid economic development, the water supply system of Korea has achieved a remarkable quantitative development in water supply. The water supply ratio, which was below 20% in the 1960s, increased to 98.8% by the end of 2015. However, it has now become necessary to pursue qualitative development to satisfy the recent growing demand of people for a higher level of water supply service. Here were cases where long-Term limited water supply was inevitable because of frequent droughts. Moreover, the scale of damage from water suspension caused by pipeline failure accident is showing an increasing trend, while the frequency of such accidents is also increasing. The occurrence of various water suspension accidents not only has inflicted enormous economic losses to both consumers and water suppliers, but also is raising distrust in water supply service. Accordingly, this study analyzed the causes of various water suspension accidents that can occur in water supply system, and then suggested a methodology that enables the assessment of the cause of individual accident from an integrated viewpoint by utilizing a fault tree analysis. In addition, for water suppliers who pursue plans for reducing water suspension risk, an optimization model was developed that enables them to set up an optimal management plan that considers both the costs incurred by the plan and the efficacy of the plan. The proposed methodology of this study for deducing optimal water suspension risk management plan could be utilized as a good tool for setting up mid-To-long term plans for stable water supply, such as the Master Plan for Water Supply System.