Flood Warning: Groundwater Flooding in South Wiltshire Downs

The Environment Agency has issued a formal flood warning for the South Wiltshire Downs and the Chilmark stream area. High groundwater levels, resulting from recent heavy rainfall, are expected to cause flooding in the region.

Alert Details

• Alert Type: Flood Warning (Severity Level 2)
• Issuing Agency: Environment Agency
• Effective Date: March 3, 2026

Affected Areas

The warning specifically covers the South Wiltshire Downs and areas surrounding the Chilmark stream. Groundwater levels across Salisbury Plain are currently high, posing a risk to residents in these geographic zones within Wiltshire.

Expected Conditions

Monitoring data indicates that groundwater levels at The Terraces borehole have reached 115.45m. These levels remain highly reactive to any additional rainfall. Residents should expect the following conditions:

• Flooding of local roads.
• Potential inundation of septic tanks and sewer systems.
• Groundwater flooding affecting property and infrastructure.

What You Should Do

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

• Property Resilience: Prepare and deploy property resilience measures immediately.
• Pump Maintenance: Ensure that all installed water pumps are switched on and functioning correctly.
• Power Backup: Consider alternative power sources in the event of power outages.
• Travel Safety: Exercise extreme caution when driving on flooded roads to ensure personal safety and to avoid creating waves that could flood nearby properties.

Timeline

This alert was officially raised at 2:19 PM on March 3, 2026. The Environment Agency is closely monitoring the situation and expects to provide an update by 3:00 PM on March 10, 2026, or sooner if conditions change significantly.