Publication Details

FLOOD MITIGATION MEASURES TOWARDS ACHIEVING ZERO FLOOD FOR SUNGAI KERAYONG CATCHMENT, SUNGAI KLANG RIVER BASIN

Flash floods have caused a lot of distress to the people living in Klang River Basin; from long hours of traffic jam congestion, damages of cars, to the destruction of homes and business properties. Comprehensive flood mitigation measures have been implemented by the authority. However, the effectiveness of the flood mitigation measures are still being questioned since floods still occurs. Thus, this research aims to analyse, evaluate, predict and provide recommendations for flood mitigation measures towards achieving zero floods for Sg Kerayong river basin, a subcatchment of Klang River Basin. This research covers the development of a hydrodynamic model which is capable to simulate the integrated hydrologic and hydrodynamic analysis, production of flood forecasting maps in real-time simulation which in later stage to serve as an important data for flood relief operations as well as to propose environmental-friendly soft-structures with appropriate flood mitigation system. Flood maps for three different rainfall designs (50-year, 100-year and Probable Maximum Precipitation (PMP) events) are produced using river modelling - TREX. This study found that Kerayong River Basin has undergone quite comprehensive flood mitigation measures which include ponds and river rehabilitation. The model simulations indicate that the mitigation measures are satisfactory to cater for the 50-year and 100-year design rainfall. However, about 7% of the catchment areas are predicted to be flooded if PMP storm events occur. If rainwater harvesting is implemented in these areas, then peak discharge can be reduced by 39% and a reduction of 50% in peak discharge can be achieved if new materials such as porous rock matrix filters are used for open spaces such as parking or pavement