Design Optimization Methodology for Diversion Structure with Concrete Cofferdam Using Risk-Based Least-Cost Design Method

The optimal size of a diversion structure should be carefully studied to ensure economic viability and safety during construction. In practice, determine the structure, design flood frequency is selected as suggested return period presented by standard, which differently. This study proposes methodology for with concrete cofferdam adopting risk analysis reflect more practical hazard dam proposed based on risk-based least-cost process analysis. optimization result lowest expected monetary value, accounts construction cost, reconstruction delay liquidated damage failure probability recovery cost overflow probability. was applied case Gulpur hydropower project in Pakistan. results showed that 1 year USD 0.5 mil. 1~2 years 1.0~2.0 3, 4, 5 usage structure. Furthermore, 2~10 value 3.0~4.0 These indicated increases increase. reveal use affect From perspective, determined or method, whereas depends countermeasure method. Therefore, after preparing proactive plan estimating determined.