A Flood Alert was issued for Groundwater flooding in West Ilsley, East Ilsley, Compton, Chilton and West Hagbourne in West Berkshire on 21st April 2026. Affected watercourses included the Groundwater.
During this event, FloodRadar monitoring gauges recorded notable rises. The Groundwater Level at Longacre rose 0.35m, peaking at 140.66m, while the Groundwater Level at Water Acre climbed 0.32m.
Environment Agency advice issued
Continued high groundwater levels may lead to flooding. Flooding of low-lying areas and roads is possible. Groundwater levels are high but slowly declining at our Hodcott borehole affecting West Ilsley, East Ilsley, Compton, Chilton and West Hagbourne. Groundwater levels are expected to continue slowly falling over the coming weeks in response to a period of more settled weather. Due to the nature of groundwater flooding, this situation could continue for several weeks or longer. Residents are advised to consider property resilience measures and ensure that pumps are working where they have be
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Longacre | Groundwater Level | +0.35m | 140.66m |
| Water Acre | Groundwater Level | +0.32m | 139.79m |
| Hodcott | Groundwater Level | +0.18m | 118.39m |
| Stonor Estate | Groundwater Level | +0.11m | 82.05m |
| Chapel Wood | Groundwater Level | +0.08m | 111.65m |