Integrated Earthquake Risk Assessment and Application Study for Urban Areas Considering Water Supply System Performance

In this study, we evaluated the risk to urban areas due to the hydraulic and water quality availability of water supply facilities caused by medium- and large-scale earthquakes, applied the results to City A in Korea, and compared and analyzed them. The analysis confirmed that the damage to hydraulic availability increased rapidly as the earthquake magnitude increased, but the water quality did not deteriorate compared to hydraulic availability. This suggests that the water quality supply risk is low except for extreme interruption in the water supply route. However, if an earthquake of a certain magnitude or greater occurs, the building risk, evacuation risk, fire risk, and water outage risk are at a certain level or higher. When considering the water quality supply risk, the overall comprehensive earthquake risk in urban areas increased. Thus, uniformly applying the weights of all factors in the earthquake risk assessment does not correctly reflect the characteristics and environment of the region, and a process of realistically calculating the weights of each factor through various methods is necessary.