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This study analyzed the hydrologic conditions and the effects of selected runoff characteristics as an attempt to estimate the optimal dredge amount for Asan-Lake in Korea. The runoff feature was calculated by utilizing the water balance simulation from DIROM (Daily Irrigation Reservoir Operation Model), which allowed changes in landuse to be quantified using remote sensing for 14 years. The distribution of prospective sediment deposits was been tallied based on the changes in landuse, and quantity of incoming sediment estimated. From these findings, we were then able to simulate the fluctuation for around the requirement annual water storage and the changing water level. The optimal dredge amount was calculated in the basis of the distribution of frequency, taking into account the design criteria for agricultural water with the 10-yaer frequency of resistant capacity.