Identifying Flood Risk from Surface Water

Surface water flooding occurs when rainfall exceeds the drainage or infiltration capacity of the surface it falls on.

This can occur naturally in rural environments when heavy rain exceeds soil infiltration rates and flows as runoff overland. More common however is surface water flooding in urban/paved areas where impermeable surfaces allow little or no infiltration of rainwater and local drainage systems cannot cope with the volume of rainfall.

The responsibility of assessing, managing and controlling the risk of surface water flooding in the county now rests with us. We are responsible for maintaining the highway drainage network to help limit the possibility of surface water flooding as far as possible.

In general, highway gullies and culverts should work without routine maintenance. However we do periodically (once a year normally) empty and cleanse gullies, removing any silt and other debris which may have built up.

We are also now responsible for identifying risk from surface water and are currently preparing a Local Flood Risk Strategy which will outline our objectives and proposals for managing surface water flood risk in the future.

The Environment Agency has produced the second generation Flood Maps for Surface Water which show areas on a national scale potentially at risk from surface water flooding. This dataset is presently not available publicly, but please contact the Environment Agency with any queries regarding the Flood maps for Surface Water.

If you have any report any issues concerning flood risk from surface water, please email our flood risk team on