JBA 5m GB Flood Map provides flood hazard information for different flood types and return periods at 5 metres resolution, including easy to use Flood Scores and Floodability ratings. The product provides flood hazard information for river, surface water, ground water (chalk areas) and coastal flooding for up to five return periods in defended and undefended scenarios, including flood depth and extent data. The JBA 5m GB Flood Map is maintained with a regular update cycle driven by the availability of the latest science and improvements to underlying datasets (e.g. terrain data).

The output from the modelling includes flood outlines and flood depth grids in five depth bands for up to five return periods (20-year; 75-year; 100-year; 200-year and 1,000-year Return Periods). ?Flood Scores summarise the JBA 5m GB Flood Map information into a single score per flood type, including or excluding the consideration of defences, and a combined score for all flood types (ranging from 0 to 53), whilst Floodability data provides easy to use colour rating scheme, banding the GB Flood Scores into 5 risk classes ranging from Green (“low”) to Black2 (“very high”).