Abstract
The effect of soil and water conservation works on the runoff was analyzed by three tank models: the 1981 model, 1983 model and 2000 model, which reproduced the runoff for the year before the conservation works was executed, the year of completion, and eighteen years after completion, respectively. These three models were used to analyze the same rainfall data, and the results were compared. Both the flood control and drought control functions were temporarily lowered during the conservation works. Eighteen years after the conservation works, the flood control and drought control function was better than that before the executed.
