7. Conclusion

What matters most in dam safety is not an issue of conflicts or interests of each party, but an issue of preventing crucial disaster when dam fails. Therefore, dam safety should be always considered in the first priority. But when we face with making sure a dam safety, sometimes conflicts occur regarding which method or solution is the best way in terms of both safety and economic aspects. Thus, the best decision-making should be made within angles of reasonable cost and rational decision with appropriate amount of conservatism and reasonable confidence.