Flood Alert Issued for Groundwater Flooding in Denmead, Hampshire

Alert Details

The Environment Agency has issued a flood alert for groundwater flooding in Denmead. This alert was raised on March 11, 2026, following observations of high groundwater levels in the Solent and South Downs area.

Affected Areas

The alert specifically covers Denmead in the county of Hampshire. Within this region, water is expected to affect Anmore Road and Mill Close. High groundwater levels may also impact the effectiveness of the local sewage network.

What You Should Do

Residents in the affected areas are advised to take the following precautions:

• Prepare and implement property resilience measures.
• Ensure that any installed water pumps are in good working order.
• Monitor local conditions closely as heavy rain could prolong flooding impacts.

Expected Conditions

While groundwater levels at the Rookwood Farm borehole have fallen by 70cm over the last week, they remain high. A weather system is forecast to bring between 15mm and 20mm of rain to Hampshire starting Thursday, March 12, 2026, and continuing into Friday, March 13, 2026. Drier weather is anticipated over the following weekend. However, if heavy rain occurs, the ongoing flooding impacts in Denmead will be prolonged.

Timeline

The alert is currently effective as of March 11, 2026. The forecast rainfall is expected between Thursday (12/03/2026) and Friday (13/03/2026). The Environment Agency will monitor the situation and provides a scheduled update for this message by 18:00 on March 18, 2026.