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KMID : 1024520040130121033
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Journal of the Environmental Sciences
2004 Volume.13 No. 12 p.1033 ~ p.1039
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Estimation of Precipitation Recharge in the Pyungchang River Basin Using SCS-CN Method
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Lee Seung-Hyun
Bae Sang-Keun
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Abstract
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The methodology developed by Soil Conservation Service for determination of runoff value from precipitation is applied to estimate the precipitation recharge in the Pyungchang river basin. Two small areas of the basin are selected for this study. The CN values are determined by considering the type of soil, soil cover and land use with the digital map of 1:25,000. Forest covers more than of the study area.. The CN values for the study area vary between 47 in the forest area and 94 in the bare soil under AMC 2 condition. The precipitation recharge rate is calculated for the year when the precipitation data is available since 1990. To obtain the infiltration rate, the index of CN and five day antecedent moisture conditions are applied to each precipitation event during the study period. As a result of estimation, the value of precipitation recharge ratio in the study area vary between for the total precipitation of the year. The average annual precipitation recharge rate is , meaning 377.9mm/year and 397.5mm/year in each basin.
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KEYWORD
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Precipitation, Recharge, SCS-CN
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