Flood Frequency Analysis Due to Climate Change Condition at the Upper Klang River Basin

The effects of flood in many countries in Asia and around the world are so tremendous, especially on economies and human lives. The climate change due to the global warming phenomena is projected to have serious impacts on the hydrological system such as severe droughts and floods. The mitigation measures to save lives and properties from the floods are related to the projection of the flood magnitude and return period of interest which is called design flood. The design flood is very important for construction and development plans along the river and flood plain. In this chapter, the study attempts to perform flood frequency analysis through the Log-Pearson type III distribution method for the historical and projected river discharges in the Upper Klang River Basin. The results show the flood frequency distribution estimated from the simulation results of the climate change data is lower than the distribution projected by the available historical recorded data of river discharges. The discharges from the projected results for the recurrence intervals of 100, 25, and 2 years are approximately 350, 182, and 61 m³/s, respectively. The outcomes of the study provide the useful information associated with the flood magnitudes and recurrence periods for the sites along the river.