A Flood Alert was issued for Groundwater flooding in the Alton area in Hampshire on 31st March 2026. Affected watercourses included the Groundwater.
During this event, FloodRadar monitoring gauges recorded notable rises. The River Wey at Alton High Street rose 0.09m, peaking at 0.26m.
Environment Agency advice issued
Groundwater levels are high but slowly declining at our Farringdon borehole near Alton and flooding of low-lying areas and roads is possible. Despite the declining trend, we expect levels to remain high over the coming days. Due to the nature of groundwater flooding, this situation could continue for several weeks or longer. We are closely monitoring rainfall and groundwater levels. Residents are advised to prepare property resilience measures and ensure that pumps are working where they have been installed. Take particular care when driving through flood water both for your own safety and to
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Alton High Street | River Wey | +0.09m | 0.26m |