A Flood Alert was issued for River Ash in the Borough of Spelthorne in Greater London, Hounslow, Surrey on 8th October 2026. Affected watercourses included the River Ash.
During this event, FloodRadar monitoring gauges recorded notable rises. The River Ash at Knowle Green rose 0.35m, peaking at 0.76m, while the River Thames at Penton Hook climbed 0.11m.
Environment Agency advice issued
There is no longer a threat of flooding. Further rainfall is forecast but no further flooding is expected. Water levels have now dropped and no further flooding is expected with further rainfall forecast for Friday. We will continue to monitor the situation and will issue further alerts or warnings if necessary. Continue to take care on waterside roads and footpaths and don't put yourself in unnecessary danger.
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Knowle Green | River Ash | +0.35m | 0.76m |
| Penton Hook | River Thames | +0.11m | 0.20m |
| Staines | River Thames | +0.10m | 2.70m |
| Chertsey Lock | River Thames | +0.09m | 0.23m |
| Shepperton Lock | River Thames | +0.08m | 0.17m |
| Sunbury Lock | River Thames | +0.06m | 0.28m |
| Staines Ash | River Ash | +0.06m | 0.10m |