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The 2D FAST solver is an innovative flood inundation modelling tool designed to allow quick assessment of flooding using simplified hydraulics. It provides results in seconds or minutes as opposed to hours or days, which are up to 1,000 times faster than traditional 2D models.

Flood Modeller Pro features three 2D solvers available for a range of applications - the 2D FAST solver is specifically designed for quick assessment of flooding. The software works by identifying depressions on the floodplain then routing water through these depressions. Water depths in the depressions are determined by the volume of water flowing into each one, the level at which water can spill into neighbouring depressions and the water level in the neighbouring depressions. The FAST solver is able to do this by adopting new ways of resolving the detailed hydraulics.

It allows modellers to rapidly estimate flood extents and depths from multiple sources of water, including tide, surge and fluvial overtopping or breaching of defenses, surface water and sewer flooding. The speed with which it calculates water depths gives modellers the flexibility to explore uncertainty. Event magnitude and the interactions and dependency between flood sources were previously unpractical or economical. The FAST solver now makes this viable at the touch of a button.

Flood Modeller Pro also provides the 2D FAST Dynamic solver which includes a method to capture the time evolution of a flood event. This solver is a prototype development and we recommend users check results against other solvers.

Download the 2D FAST factsheet

The application of this solver includes near real-time flood inundation prediction on the Tidal Thames in London, England, through to prediction of areas susceptible to pluvial flooding for the whole of Scotland.

Inundation flood mapping in Boston, USA

The 2D FAST solver has been applied on flood inundation projects for the City of Boston, USA

ISIS 2D flood modelling outputs displayed within ISIS MAPPER

It has been used on large-scale floodplain mapping projects in Southern Ontario, Canada

Visualising flood depths and velocities in the Marikina, Philippines

It has been utilised for real-time surface water flood forecasting in Manila, Philippines.

Storm surge barriers NYC.png

It has supported a storm surge barrier study for New York City’s Gowanus Canal and Newtown Creek.

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