A Flood Warning was issued for Groundwater flooding in the upper Avon valley and the Nine Mile river in Wiltshire on 3rd March 2026. Affected watercourses included the Groundwater.
During this event, FloodRadar monitoring gauges recorded notable rises. The Groundwater Level at Windwhistle rose 2.07m, peaking at 76.25m, while the Groundwater Level at Homington climbed 1.74m.
Environment Agency advice issued
High groundwater levels are expected to cause flooding. Groundwater on the Salisbury Plain remain high. Areas that could be affected include: Upper Avon Valley and the Nine Mile River. The groundwater level at Everleigh borehole is at 131.18m, and remains reactive to further rainfall. Residents are advised to prepare property resilience measures and ensure that pumps are working where they have been installed. Residents may experience inundation of septic tanks and sewer systems. Properties may experience flooding in cellars in affected areas. Flooding of roads is expected, take particular car
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Windwhistle | Groundwater Level | +2.07m | 76.25m |
| Homington | Groundwater Level | +1.74m | 69.87m |
| Oakley Industrial Estate | Groundwater Level | +1.07m | 94.20m |
| Stoford Cross | Groundwater Level | +0.91m | 71.04m |
| Everleigh | Groundwater Level | +0.90m | 131.61m |
| Chitterne Down | Groundwater Level | +0.70m | 100.33m |
| Clarendon | Groundwater Level | +0.47m | 73.70m |
| Queen Manor Farm | Groundwater Level | +0.22m | 70.84m |
| Hazelberry Plantation | Groundwater Level | +0.19m | 126.77m |