2. London – Surface Water Threats Across the Capital
While London has some defences like the Thames Barrier, it remains highly susceptible to surface water flooding. One in four properties lie in areas at medium or high risk from surface water—resulting from overwhelmed drains during heavy rain.
The recent extreme rainfall event on July 25, 2021 (a month’s worth of rain falling in just two hours) is a reminder that autumn downpours can trigger similar chaos—disrupting transport, damaging hospitals, and causing extensive property damage. Experts warn a £2 billion investment is required to protect the city long-term.