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김현준,김승,김형섭,정성원,Kim Hyeon-Jun,Kim Sung,Kim Hyeong-seop,Jung Sung-won 한국관개배수위원회 1995 한국관개배수논문집 Vol.2 No.1
Since precipitation is variable with time and space, a mean annual precipitation should be estimated with adequate consideration of their variations. In Korea, the thirty-year period has been widely used to estimate the mean annual precipitation. However,