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River Levels

Groundwater flooding in upper River Ems Valley

Message issued at 4:15pm, Monday 23rd February

This is an archived message. The status has changed more recently.

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Flooding possible. Be prepared.

Flood alert

Groundwater is high, very close to the surface, but slowly falling at the Compton borehole. Springs will appear, water will be in fields, and water will flow down roads, including Stoughton main road, the road from East Marden, between Cooks Lane and Barley Mow in Walderton, and the B2146 near Woodlands Lane. Groundwater will also affect a small number of cellars in Stoughton and Walderton. Only isolated showers are forecast Monday to Wednesday 25/02/2026. On Thursday 26/02/2026 a weather front is forecast to bring widespread rainfall. There is uncertainty in rainfall amounts, and predictions may change, but it is probable that groundwater at Compton borehole will rise again from Friday 27/02/2026 through to next week. Groundwater levels should not rise significantly higher than they have been so far this winter. Groundwater flood impacts will continue until the middle of March. Weather could remain unsettled through March, although perhaps with rain less often. Take care on roads that flood (Stoughton, Walderton). Ensure pumps work. We will update this message by 18:00 27/02/2026.

Information supplied by the Environment Agency

This information last updated 4:15pm, Monday 23rd February.

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Most recent flood warnings and alerts for Groundwater flooding in upper River Ems Valley

Flood Warning Area Details

Areas at risk of groundwater flooding on the upper River Ems at Compton, West Marden, Stoughton, Walderton and Racton

Region: Solent and South Downs

Country: England

Counties covered: West Sussex

Watercourses covered: Groundwater

Area covered by this alert location

The area bounded in blue on the map shows the area covered by flood alerts and warnings for Groundwater flooding in upper River Ems Valley.

Note: the area shown on the map is the area covered by flood alerts and warnings. It is not a live map of current flooding. The area covered broadly equates to the area where the risk of flooding in any year is greater than 1% (the "hundred year" flood risk).

Other Nearby Flood Warning Locations

Groundwater flooding in Stoughton and Walderton
Areas at risk of groundwater flooding on the upper River Ems, including Stoughton, Walderton and Walderton Bridge

No current or recent warnings.

Groundwater flooding in Finchdean, Dean Lane End and Rowlands Castle
Areas at risk of groundwater flooding in Finchdean, Dean Lane End, Idsworth and Rowlands Castle

No current or recent warnings.

Westbourne, Lumley and Emsworth on the River Ems
Westbourne, Lumley and Emsworth on the River Ems, including New Brighton and Commonside

No current or recent warnings.

Lower River Ems
The River Ems and tributaries from Racton to Emsworth Harbour including Westbourne

No current or recent warnings.

Lavant Stream at Havant
Lavant Stream from Woodberry Lane to Langstone and Brockhampton

No current or recent warnings.

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