This study investigated the effect of the lag time on the concentration time and the change in effective rainfall depending on the infiltration capacity and rainfall intensity by the status of land use to research the relevance of infiltration capacity-rainfall intensity and the effective rainfall by land categories according to the characteristics of the drainage basin. As a result of analysis, deviation in the lag time is significantly occurring from two hours to nineteen hours and fifty-five minutes depending on the rainfall intensity and the form of the flood hydrograph rising limb is being determined by this. It has been analyzed that the forest land is divided into the region where runoff does not occur even with the rainfall of more than 500 mm/hr and the region where runoff occurs 100% with the rainfall of more than 80 mm/hr and there is an upland field area where runoff does not occur even with the rainfall of more than 120 mm/hr and the area where runoff occurs 100% if the rainfall of more than 20 mm/hr occurs while runoff may occur 100% in the land and rice paddy with the rainfall of 20 mm/hr. As the infiltration capacity varies according to the soil series and status of land use, the objective application of the runoff coefficient of rational method and runoff curve number is needed.
This study provided the value of infiltration capacity by soils after taking experiments of initial infiltration capacity on 29 sites from 18 soil series that were selected from the area of Hongcheon River. According to the result of our study, there is no significant difference between the field and the paddy in terms of initial infiltration capacity, but there is a huge difference between woods and the earth. Then, we suggested a curve formula of infiltration capacity on soil series that have a high defining coefficient based on the data from our study. In the end, we compared effective precipitation by methods of measuring it. The result of this comparison suggested that water is spilled intensively in the latter half of raining when Horton's method is used, and water is spilled from the beginning and is spilled more in the latter half when NRCS is used. The value of effective precipitation was calculated less when Horton's infiltration capacity curve formula was used than when NRCS's AMC-II conditions were applied.
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