• Journal of Korea Water Resources Association
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• v.57 no.10
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• pp.725-739
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• 2024

In Korea, the national PMP map is used to calculate the Probable Maximum Precipitation (PMP) but the intercept adjustments are necessary to obtain uniform PMP envelopment results. The Box-Cox and cubic Spline methods to get the PMP envelopment modeling were proposed by the past studies.. However there has been no significant progress in the study of PMP envelopment modeling since then. This study, which focused on the last step of PMP estimation process in Korea, used the Monotone Cubic Spline (MCS) and compared with existing methods. As a result, the intercept adjustments involving the engineer's subjectivity were necessary to obtain smooth envelopment curves in case of using the existing method such as the cubic spline. However, a smooth envelopment curves were obtained without intercept adjustment in case of using MCS method. Therefore, using the MCS method for dam-related new projects can get smooth and consistent envelopment results without intercept adjustment for PMP calculation in Korea.