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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.

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.

Additional solvers

The 2D FAST solver dynamically links to the 1D solver to enable an integrated modelling approach. Users can also switch between the 2D ADI and 2D TVD solvers when building models, enabling large and complex studies to be undertaken much quicker than previously possible.

1D solver

Developed for 40 years, our 1D solver has become one of the fastest and most robust solutions available. The 1D solver provides a comprehensive range of methods for simulating flows and water levels and can be confidently applied to a range of applications.

2D ADI solver

The ADI solver has been developed for fluvial, overland, estuarine and coastal modelling problems where the flow is not rapidly changing. It is quick, accurate and robust, and is based on the long-established DIVAST solution - first developed in the 1980s.

2D TVD solver

The TVD solver has been developed specifically to provide accurate representation of 2D ‘shocks’ (rapid changes in water surface profile). It allows complex hydraulics to be calculated more accurately and provides increased stability.

Featured products

Flood Cloud

Flood Cloud enables users to seamlessly undertake flood modelling, at any scale, in the cloud. It provides users of Flood Modeller Pro and Flood Modeller Free with an innovative new way to run 1D, 2D and linked 1D-2D models.

Flood Modeller Pro

Flood Modeller Pro delivers a fully integrated flood modelling experience. With a legacy stretching back 40 years, it allows users to model rivers, floodplains and urban areas, using our powerful 1D and 2D solvers.

Flood Alert

Our innovative smartphone application provides real time flood warning updates direct to your mobile phone.  Freely available on Apple, Android, Windows and Blackberry devices (in the UK).

Flood Viewer

A new way to share flood model results with almost anybody, without the need to install any specialist software or be connected to the internet. Create projects for free and easily with Flood Modeller.

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