The prediction of inundation area and knowledge flood dynamics is a useful tool in floodplain and flood risk management. In the past, to use a one dimensional hydraulic model is a common practice among hydraulic modeller compared to the two dimensional (2-D) hydraulic models. This is due to the fact that 2-D models have been confined by the inadequacy of high quality topographic data. However, with development of topographic data collection techniques to form digital elevation models (DEMs), from conventional (e.g. ground survey) to airborne remote sensing techniques; light detection and ranging, and with availability of computational resources, the later hydraulic model, may produce more accurate simulated results. A higher resolution DEMs would therefore detect and describe small sinks and peaks more precisely whereas lower resolution DEMs may even be unable to capture these small sinks or peaks. Re-sampling of the DEMs may become more common due to important of flood modelling at regional or global scale.