Time-Based Modeling of Unit Hydrograph Using the Radial Watershed Physical Parameters

M. Firman, Mohammad Bisri, Ussy Andawayanti, Runi Asmaranto


This study intends to develop a time-based (Tb) model using radial watershed physical parameters. The methodology consists of (1) determining the unit hydrograph time base (Tb), (2) identifying the characteristics of the physical radial watershed, (3) identifying the radial watershed physical parameters that have a significant effect on the time base and (4) developing a time-based (Tb) model. This research involves ten physical watershed parameters from ten radial watersheds spread across Java and Sulawesi islands to be tested. As a result, parameters of the main river slope (S) and factor of the main river length and the river length from outlet to the nearest to the center gravity of the watershed [L.Lc] together have significant ability to estimate the time base (Tb) variability. The resulting statistical indicator is Adj. R2 = 0.87, standard error of the estimate (SEE) = 0.10, Sig. F = 0.00, and also the requirements of the model residual test are met. It has a good level of accuracy, with mean absolute error (MAE) = 0.07%, root mean square error (RMSE) = 0.09 and Nash-Sutcliffe Efficiency (NSE) = 0.89.


Keywords: radial watershed, physical parameters, time base, statistic, modeling.

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