A Flood Alert was issued for Groundwater flooding in the Alton area in Hampshire on 24th February 2026. Affected watercourses included the Groundwater.
During this event, FloodRadar monitoring gauges recorded notable rises. The Petersfield Stream at Winchester Road rose 0.06m, peaking at 64.96m.
Environment Agency advice issued
Rising groundwater levels may lead to flooding. Flooding is possible from 24 February 2026. Groundwater levels are currently rising at our Farringdon borehole near Alton. Groundwater levels are above normal for this time of year and have now reached a level where communities may be affected by groundwater flooding within the next few days. We expect levels to continue rising. Due to the nature of groundwater flooding, this situation could continue for several weeks or longer. We are closely monitoring the situation. Residents are advised to prepare property resilience measures and ensure t
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Winchester Road | Petersfield Stream | +0.06m | 64.96m |