Author(s): Taegyun Kim; Kanghoon Yoon; Jongnam Choi; Myoungsun Han

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Keywords: CN; Rela-time forecasting system; Water stage

Abstract: According to the experience and existing research about flooding forecasting system, the new method to estimate CN would be necessary, since it is very difficult to operate the flood forecasting system using the method which uses the AMC from 5-day antecedent rainfall developed by SCS. It could be assumed that the maximum potential retention (S) will be related to the groundwater or groundwater levels; therefore, the relationship between water stage in river and maximum potential retention (S) would be investigated. In order to derive the relationship, the flooding data of 1980 through 2007 in SulMaChun Stream is used, since this data is delicately constructed. Here, the CN is calculated using the total rainfall discharge and the total depth of runoff discharge at the flooding period and then water stage in river and maximum potential retention (S) would be determined. The relationship between water level in river and maximum potential retention (S) or CN has a higher correlation under the specific water stage of about 0.1m3/sec/km2; however, it shows relatively lower correlation above the specific water level. This result shows that NRCS method represents the relationship very well in the lower water stage as infiltration is actively occurred with relatively higher maximum potential retention (S).

DOI:

Year: 2009