Hull Fluvial Flooding

Following a request from The Association of British Insurers to the UK Environment Agency to increase the robustness and extent of pluvial flood modelling Ambiental undertook a robust pluvial modelling test to set a best practice standard on modelling inputs.

Primarily due to the overprediction of flooding caused by artefacts in DSM’s these performed less well than either DTM’s. Of the DTM approaches, simulations based on DTM + buildings slightly underperformed bald earth DTM due to the effect adding detailed building information has upon floodplain storage. LiDAR was proven significantly better than IfSAR for building-level pluvial modelling due to poorer representation of flow paths and accumulation areas with IfSAR data.

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