Flood modelling
Flood risk can be complex. Water does not always follow obvious paths, and during heavy rainfall or river flooding it can move quickly across land, through drainage systems, and around buildings and infrastructure.
Flood modelling helps us understand how water is likely to behave during these events. By recreating rainfall and river conditions in specialist software, we can simulate how water flows across a site and through the surrounding landscape.
This allows us to identify where flooding may occur, how deep it could be, and how quickly water may move. With this information, we can design developments and infrastructure that manage flood risk responsibly and safely.
Flood modelling is commonly required to:
-
support planning applications and site allocations
-
assess flood risk to existing and proposed development
-
identify exceedance flow routes and residual risks
-
test the effectiveness of mitigation measures
-
inform land shaping, drainage, and flood alleviation design
What do we offer?
Flood & Civil provide robust, transparent flood modelling services to support development, infrastructure, and flood alleviation projects. Our capabilities include:
-
2D surface water (pluvial) modelling to assess overland flow, ponding, and exceedance routes
-
1D–2D linked modelling of rivers, culverts, bridges, and channels
-
Climate change and sensitivity testing to assess future flood risk
-
Options appraisal and mitigation testing, including basins, bunds, channel modifications, and flow restrictions
-
Model build reports and methodology notes suitable for planning, EA/LLFA review, and technical assurance
-
Flood outputs, including extent, depth, velocity, and hazard mapping
-
GIS deliverables (GeoTIFF / ASCII grids) for integration with client and stakeholder datasets
-
Clear visuals and animations to support stakeholder engagement and decision-making
All models are developed using appropriate topographic data, hydraulic assumptions, and verification checks to ensure results are proportionate, auditable, and fit for purpose