A Flood Alert was issued for Thorney Island to West Itchenor in West Sussex on 26th October 2026. Affected watercourses included the Chichester Harbour.
During this event, FloodRadar monitoring gauges recorded notable rises. The Tide at Medmerry rose 1.56m, peaking at 2.86m, while the West Brook at Emsworth climbed 0.40m.
Environment Agency advice issued
There is no longer a threat of flooding, though standing water and debris may still remain. Coastal conditions are expected to improve and no flooding is expected. We will continue to monitor the situation and work with emergency services and local authorities. Stay away from floodwater - it contains hidden dangers such as open manhole covers, sewage and chemicals.
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Medmerry | Tide | +1.56m | 2.86m |
| Emsworth | West Brook | +0.40m | 2.16m |
| Havant | Hermitage Stream | +0.20m | 5.28m |
| Crosslands Drive | River Lavant | +0.17m | 0.30m |
| Chichester Tozer Way | River Lavant | +0.06m | 12.68m |
| Graylingwell | River Lavant | +0.05m | 0.04m |
| Westbourne | River Ems | +0.05m | 0.11m |