In this study unit hydrograph and infiltration capacity curves have been determined based on
rainfall-runoff data for the upper Ansung stream basin. Infiltration capacity curve also has been computed based on
measurements of accumulated infiltration. Accumulated infiltration curve which has close relationship with unit
hydrograph has been found in adopting the following two approach methods. In the first method the mean
infiltration capacity with infiltration index method and the Kostiakov accumulation infiltration curves have been
computed based on hydrological data for the GongDo gauging station of the upper Ansung stream basin. In the
second method the accumulation curve has been determined through directly observed infiltration data for four points
in the upper basin and has been compared with the infiltration capacity curves by three observed rainfall-runoff
event.
Keywords : Infiltraion capacity, Accumulated infiltration, Kostiakov