Flood flow simulations and return period calculation

What is it about?

The City of Kota Tinggi in Malaysia was under more than 5 m of water during the floods in December 2006 and January 2007. The watershed received between 280 and 530 mm of rain in 4 days. These extreme events occurred 3 weeks apart and caused extensive damages. The application of the TREX model to simulate these events and the estimation of the return period of such extreme events are the main objectives of this study. The model performance was very good in simulating these extreme flood events. The December 2006 rainstorm event at Kota Tinggi is extremely rare, and the estimated return period is greater than 2000 years. A flood threshold graph was produced by integrating both the hydrological modelling process using TREX and the theoretical formulation of return period. The proposed flood threshold graph is useful in the estimation of the amount of accumulated rainfall from multiday rainfall that can cause flooding on a large watershed like Kota Tinggi.

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Why is it important?

1. The application of the TREX model to simulate extreme rainfall events 2. Introduce a methodology to estimation the return period of an extreme event, as a result of multiday rainfall 3. The December 2006 rainstorm event at Kota Tinggi is extremely rare, and the estimated return period is greater than 2000 years. 4. The proposed flood threshold graph is useful in the estimation of the amount of accumulated rainfall from multiday rainfall that can cause flooding on a large watershed