Using Green-Ampt Loss Method in Surface Runoff Simulationff Klang Watershed in West Malaysia

摘要

Usual methods of runoff and flooding estimation are expensive, time consuming and inaccurate because of various variables of the watershed. As such, using Geographic Information System (GIS) to develop hydrology model through the sub-watershed data in water resources management and planning is the only viable method to date. The main aim of this research is to estimate of the peak flow in the Klang watershed using the Green-Ampt method as a major component in runoff and flood modelling. The storm daily surface runoff and flow data were compared to observed values at the outlet of the watershed. The study is conducted in the 674 km~2 Kuala Lumpur watershed located in Klang basin of Malaysia. The catchment delineation is generated for the Klang watershed to obtain the sub-watershed parameters using HEC-GeoHMS extension in ARCGIS. All necessary parameters are assigned to the models applied in this study to run the runoff and flood model. The results show in a high accuracy and a good fit with the measured discharge and flow at the basin outlet. These results show that the method is capable to make accurate calculations and predictions for flooding events in the Kuala Lumpur watershed.