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Inundation flood mapping in Boston, USA

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 features three 2D solvers available for a range of applications - the 2D FAST solver is specifically designed for quick assessment of flooding, providing results up to 1,000 times faster than traditional 2D models.

  • Available free – up to 100,000 2D cells!
  • Rapidly estimates flood extents and depths from many sources of flooding, including coastal, fluvial, surface water and sewer flooding
  • Enables flood mapping at local, regional and national scales
  • Real-time flood mapping when linked to forecast rainfall
  • Used in conjunction with more detailed modelling software
  • Reduces the cost of detailed modelling by identifying the flood risk ‘hot spots’ where detailed analysis is needed
  • Can be used in probabilistic analysis frameworks

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 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.

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 to mapping flood risk scenarios for the Philippines.

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.

Rapidly tests solutions that protect people, property, critical infrastructure and the urban environment

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