Hydrologic Modeling of Extreme Events

Authored by: Jazuri Abdullah , Jaehoon Kim , Pierre Y. Julien

Encyclopedia of Natural Resources

Print publication date:  July  2014
Online publication date:  June  2014

Print ISBN: 9781439852583
eBook ISBN: 9781351043847
Adobe ISBN:


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The TREX watershed model has become a very powerful tool to simulate floods from extreme rainstorms. Malaysia experiences some of the world’s most devastating floods and the Semenyih watershed was selected for this study. Approximately half of this 236 km2 watershed is covered with forest under rapid development for agriculture and urbanization. The TREX model has been calibrated using precipitation data from April 13, 2003 and has been validated with several other storms. The model is numerically very stable and matches both the peak discharge and the time to peak very well. The potential effects of the world’s greatest precipitation at 68 mm/hr for 16 hours have been simulated to represent the case of long monsoon precipitation on the Semenyih watershed. The model results provide a dynamic illustration of the magnitude and duration of the vast flooding area with flow depths in excess of 6.0 m which would occur in the relatively flat and wide agricultural and urbanized areas. These flood mapping results should facilitate the analysis of flood hazards and disaster prevention.

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