Environment Agency monitoring directory
Areas at risk of groundwater flooding around Flamstead, including Trowley Bottom and Lower Sawpit Wood
Live Environment Agency feed
Is an official warning active now?
Official area details
- Watercourse or coast
- Groundwater
- Directory county
- Hertfordshire
- EA operational area
- Hertfordshire
- Coverage category
- Designated Flood Alert Area
Use this information safely
- For conditions now: use the live panel and verify on the official flood service.
- For a property: use the official long-term risk checker; this directory is not address-level evidence.
- For river levels: open a nearby monitoring station and check the reading time.
- For immediate danger: follow emergency-service instructions and call 999.
Nearby river-level stations
These are measuring instruments, not reported flood locations. A station reading must be interpreted with its timestamp, station datum and any official threshold context.
Colney Street
River Ver · Colne (Upper)
Radlett
Radlett Brook · Colne (Upper)
Hemel Hempstead, Old Fishery Lane
River Bulbourne · Colne (Upper)
Rickmansworth
River Chess · Colne (Upper)
Redbourn
River Red · Colne (Upper)
Fulling Mill
River Mimram · Mimram
Harpenden
River Lee · Upper Lee
Hemel Hempstead, Bury Mill
River Gade · Colne (Upper)
Nearby designated monitoring areas
Property and insurance decisions
Inclusion in an EA monitoring area does not by itself establish a property's flood probability, insurance eligibility or premium. Check the address-level official service and ask the insurer or a qualified surveyor about the property.
Read the flood insurance guide →