Abstract
In this study HEC-HMS rainfall-runoff Model was used for flood season discharge analysis at
Sutong watershed located at upstream of Daecheong dam. Initial parameters were computed by
using empirical formula commonly applied at domestic level. The runoff Curve Number(CN)
estimated to be 88 according to AMC-III. Rating curve was estimated on the basis of measured
discharge of major rainfall events from 2012 to 2014 for the calibration and validation of the
model. Calibration was performed using the estimated rating curve for major rainfall event of
2014 and verification was performed for major rainfall events of 2012 and 2013. The
quantitative comparison between observed and simulated runoff through the calibration and
verification showed a good result of relative error within 5%. Applying the parameters calibrated
in this study, future flood season runoff analysis at Daecheong dam upstream is believed to be
able to simulate a more reliable flood runoff.
Key words: Dam, rainfall-runoff model, calibration, verification