Skip to main content
London Borough of Southwark Home

Flash Flooding: Advice and Guidance

Flood Aware: Helping Southwark Residents Prepare for Flash Flooding

Flash flooding can happen quickly during periods of heavy rainfall, particularly in urban areas where drainage systems can become overwhelmed. Residents living in basement or lower-ground-floor properties may face a higher risk and should take steps to prepare in advance.

Why This Matters

Climate change is increasing the likelihood of intense rainfall events across London. While the risk remains relatively low for most homes, flooding can cause significant damage and may pose risks to life when it occurs.

Support Your Community

If it is safe, check on neighbours who may need additional support, particularly older residents and those with health or mobility needs.

Useful Contacts

  • Emergency services: 999
  • Environment Agency Floodline: 0345 988 1188
  • Thames Water (sewer flooding): 0800 316 9800
  • National Flood Forum: 01299 403 055

Taking Action Across London

The Mayor of London and partners are investing in projects to improve London's resilience to flooding, including major infrastructure and environmental improvements. The Flood Ready London partnership has also published a long-term strategy to help communities prepare for and respond to flash flooding.