In the original FloodMap, floodplain inundation is described with a 2D diffusion-based treatment (Yu and Lane 2006a). This coupled with the 1D description of the river flow, allow coupled modelling of flood inundation.
The underlining principle of FloodMap_Subgrid is similar to FloodMap. This mode allows the sub-grid topography to be represented by a finer grid. Mass distribution is accounted for by the sub-grid topographic variation. Results suggest this produced better predictions as compared to the original formulation. (Yu and Lane 2006b)
FloodMap has recently adopted an inertial formulation of Bates et al. (2010).
FloodMap has been developed to incorporate hydrological processes as a tightly-coupled module, considering key processes associated with hydrology, along with inundation. Distributed rainfall and parameter sets can be taken.
Flood modelling often involves prediction of the inundated extent over large spatial and temporal scales. As the dimensionality of the system and the complexity of the problems increase, the need to obtain quick solutions becomes a priority. However, for large-scale problems or situations where fine resolution data is required, it is often not possible or practical to run the model on a single computer in a reasonable timeframe. FloodMap-Parallel was developed to enable large-scale simulations to be run on distributed multi-processors.
For more details, please refer to Yu, D. 2010. Parallelization of a 2D flood inundation model based on domain decomposition. Environmental Modelling & Software 25:935-945. doi:10.1016/j.envsoft.2010.03.003.