Risk of Flooding from Surface Water - Flow Direction

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 flow direction. It shows the direction in which water will flow when the water is travelling at maximum speed during a flood. There are separate layers for each of the following likelihoods of flooding: 3.3% chance in any given year (1 in 30); 1% (1 in 100) chance in any given year; 0.1% (1 in 1000) chance in any given year. Attribution statement: © Environment Agency copyright and/or database right 2025. All rights reserved.