Risk of Flooding from Surface Water - Model Origin

Risk of Flooding from Surface Water (RoFSW) map is an assessment of where surface water flooding may occur when rainwater does not drain away through the normal drainage systems or soak into the ground, but lies on or flows over the ground instead. It is produced using national scale modelling and enhanced with compatible, locally produced modelling from lead local flood authorities (LLFAs). The RoFSW datasets include information about flooding extents, depths, speed and hazards. This dataset shows information about the data used in the RoFSW maps. For each location it shows which flood risk model has been used, whether national scale modelling or a detailed local model, and information about that model. It applies to the RoFSW present-day datasets. Attribution statement: © Environment Agency copyright and/or database right 2025. All rights reserved.