Abstract
In this study, we investigated the relationship between the geographical and hydrologic factors andamount of deposit sand in many dams. The geographical factors include drainage area, value of undulation and are a of landslides which influence the amonut of flow-out sand. The hydrologic factors include an annual maximum amount of in-flow and tow day rain fall of maximum year. We also investigated the total amount of deposit sand and lapsing years to obtain the characteristic of depositing sand. From these results. We obtained the equation estimating the amount of deposit sand.
