Case study on sediment control by a slit sabo dam

Abstract

How sediment was controlled by a slit sabo dam was reported based on data obtained from the September '98 storm which hit the Yunoiri-sawa basin, a branch of the Matsukawa River. Photogrephs and survey data taken before and after the event were analyzed with the following results. The slit sabo dam checked the sediment during the storm and released it probably during the recession period of the storm. The sediment newly deposited was easily and quickly eroded away during and after the storm. The wings of an ordinary closed typed sabo dam built downstream of the Yunoiri-sawa also worked as a slit sabo dam.