Hydrological river modeling for Sungai Lembing Area Bukit Kenau using Infoworks RS

Flood is an overflow or accumulation of an expanse of water that submerges land. It may result from the volume of water within a body of water, which overflows, resulting that some of the water escapes its usual boundaries. Floodplain and near river area nowadays are at risk of flood. Buldt Kenau area is also included. Whenever there are high precipitations, the water level will increase and could cause flood. Mitigation could be technical and nontechnical, structural and nonstructural. Structural mitigation such as constructing channels and sewers were the main method of flood mitigation. Infoworks software is chose to estimate the critical water level where flood could happen. This study can be used to help to prevent flood problem for the people especially at Pahang River. The objective of this study is to develop and validate 1-Dimensional hydrological modeling of Sungai Lembing on area Bukit Kenau using Infoworks RS. Hydrological data are collected from JPS and Map area obtained from JUPEM. Infoworks RS are used to simulate the flood event on Bukit Kenau. Steady and unsteady flow simulations were run for 20 and 50 ART. Rational method is used based on Manual Saliran Mesra Alam (MASMA) for the design rainfall calculation. The results shows that at some area, the water level is higher that left or right bank of the river, so that area will have risk of flood. The simulation water level on JPS station is 1.8m and actual level is 1.81 im, so the error calculated is 0.61%, which is allowable. Some methods can be taken for flood mitigation such as increasing the section area of the river or increasing height of bank so that the flow will have more space. The ability of Infoworks RS to run flood simulation on Sungai Lembing area Bukit Kenau is acceptable as the error calculated from validation process are small