Groundwater flooding in Vernham Dean, Upton and the Bourne Valley
Communities at risk of groundwater flooding in Vernham Dean, Upton and the Bourne Valley in North Hampshire including Hurstbourne Tarrant and St Mary Bourne
Groundwater
Hampshire
Solent and South Downs
Code: 065FAG002
Flood Alert
Active Warning
Raised: 24 Feb 2026 at 4:41pm • Updated: 24 Feb 2026 at 4:41pm
High groundwater levels may lead to flooding.
Flooding is possible . Mostly light rain (19mm) has fallen in the last week.
At Vernham Dean, the groundwater level has started to stabilise. Flooding is affecting a small number of cellars in Upton. Septic tanks will also struggle to operate properly. On Tuesday 24/02/2026, Wednesday 25/02/2026 and Saturday 28/02/2026, the weather is expected to be dry. From Thursday 26/02/2026 into Friday, further rain (between 15 and 25mm) is forecast to affect Hampshire. If heavy rain affects the Bourne Valley, levels will rise for another 2 weeks. Cellar flooding and sewerage system impacts in St Mary Bourne, Hurstbourne Tarrant, Stoke, and Vernham Dean could occur during March.
We are closely monitoring the situation .
Residents are advised to prepare property resilience measures and ensure that pumps are working where they have been installed , especially if you are in Upton.
This message will be updated by 6:00PM on 03 March 2026 or as the situation changes.
