Flood alert
Areas affected: River Mimram in Hertfordshire
ACTIVE
Started at: 13:08 BST on Wed 21 May
Flooding is possible - be prepared
Flooding is affecting low lying land, roads and gardens close to the River Mimram. The situation is now improving with reduced water levels in key hotspots.
We are monitoring the flooding affecting the Fulling Mill Lane, Singlers Marsh, and Codicote Road areas in Welwyn.
Flooding to homes and businesses is unlikely at this time, but there may be a risk to very low-lying properties or those with basements. River levels in other areas remain below levels of concern.
Avoid using low lying footpaths and any bridges near local watercourses and do not attempt to walk or drive through flood water. We are continuing to monitor the situation.
This message will be updated by 5pm, Wednesday 28th May 2025, or as the situation changes.