A Flood Alert was issued for Groundwater flooding in Denmead in Hampshire on 26th February 2026. Affected watercourses included the Groundwater.
During this event, FloodRadar monitoring gauges recorded notable rises. The River Lavant at West Street rose 0.10m, peaking at 7.41m, while the Hermitage Stream at Havant climbed 0.09m.
Environment Agency advice issued
High groundwater levels may lead to flooding. Flooding is possible . Little rain (10mm) has been recorded in the last week. The rate at which groundwater levels are rising in Denmead has started to slow. Water is flowing into the road and could affect the sewage network in operating as efficiently. From Thursday 26/02/2026 to Monday 02/03/2026, only small amounts of rain are expected in Hampshire. Groundwater levels in Denmead will begin to stabilise during the next week. We are closely monitoring the situation . Residents are advised to prepare property resilience measures and ensure that
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| West Street | River Lavant | +0.10m | 7.41m |
| Havant | Hermitage Stream | +0.09m | 5.37m |
| Denmead | River Wallington | +0.08m | 33.54m |
| North Fareham weir | River Wallington | +0.07m | 0.51m |
| Crosslands Drive | River Lavant | +0.06m | 0.58m |