A Flood Alert was issued for Groundwater flooding in Finchdean, Dean Lane End and Rowlands Castle in Hampshire, West Sussex on 23rd February 2026. Affected watercourses included the Groundwater.
During this event, FloodRadar monitoring gauges recorded notable rises. The River Lavant at West Street rose 0.46m, peaking at 7.43m, while the West Brook at Emsworth climbed 0.20m.
Environment Agency advice issued
High groundwater levels may lead to flooding. Flooding is possible , as a lot of rain (42mm) has fallen in the last week. Groundwater levels at the borehole in Finchdean are relatively stable. The Idsworth and Chalton Lavants are both flowing. Road flooding is expected to be deep in all villages. Cellar flooding in Finchdean, Dean Lane End and Rowlands Castle is ongoing. Sewerage system impacts could also be possible. From Monday 23/02/2026 to Wednesday 25/02/2026, dry weather is expected. From Thursday 26/02/2026 to Friday 27/02/2026, further rain (15 to 25mm) is forecast. If heavy rain occ
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| West Street | River Lavant | +0.46m | 7.43m |
| Emsworth | West Brook | +0.20m | 2.06m |
| Havant | Hermitage Stream | +0.17m | 5.48m |
| Crosslands Drive | River Lavant | +0.16m | 0.74m |
| Denmead | River Wallington | +0.09m | 33.56m |