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The NRCS-CN method is generally applied for estimating effective rainfalls in practice, in which the basin-averaged CN is norma lly used. In order to develop a more appropriate method for estimating effective rainfalls in a basin, this study compared estimate d effective rainfalls from two distinct methods with the observed direct runoff. The first method is to estimate the basin-representative effective rainfall using the basin-averaged CN (hereafter, effective rainfall I), whereas the second method to estimate the basin-average d effective rainfall through areal-averaging sub-area effective rainfalls corresponding to the soil type and landuse type (hereafter, effec tive rainfall II). The overall results indicated that the effective rainfall II was higher than the effective rainfall I and closer to the observed direct runoff. The study also performed error analyses to verify that the effective rainfall II can be applied in practice in a basin as more accurate estimate of basin-representative effective rainfall.Key words : Rainfall-Runoff, Effective rainfall, Direct runoff, NRCS-CN method          CN  NRCS-CN   .           ,  CN    CN   ( I)  CN       ( II)  ,  -      .   ,  II  I    ,   I       . ,      II  I          . : -, , , NRCS-CN

Comparative Analysis of Estimation Methods for Basin Averaged Effective Rainfall Using NRCS-CN Method