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The objectives of this study are to estimate the annual and monthly actual evapotranspiration for the Bokhacheon upper-middle watershed using the data from 1996 to 2012 simulated by SWAT-K model, and to evaluate the effect of storage change on the actual evapotranspiration based on water balance estimates. The simulated results of the annual actual evapotranspiration showed the range from 401 mm to 494 mm and the annual mean of 436 mm, about 31% of the annual mean of precipitation. The average monthly estimates of the actual evapotranspiration showed the range of 10 mm/month in Dec to 84 mm/month in Jul. From the analyses of annual mean storage changes according to data length, it was found out that more than four to five years of data of precipitation and runoff are needed to estimate the watershed based actual evapotranspiration with ignorance of the storage change for this study area. Furthermore, annual and monthly relations between the storage change and the difference of precipitation and runoff were derived which can be effectively used for estimating actual evapotranspiration based on water balance analysis. keywords : actual evapotranspiration, SWAT-K, water balance estimates, watershed storage change

Estimation of Actual Evapotranspiration and Storage Change for the Bokahcheon Upper-middle Watershed