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This is an archived message. The status has changed more recently.
Flooding possible. Be prepared.
This flood alert is being issued based on the forecast heavy rainfall we are expecting overnight on Monday 4 October into Tuesday. This is likely to cause the river to rise.
The main area of concern is currently Warrengate including South Mimms, Potters Bar, Brookmans Park and Welham Green.
There is likely to be flooding to low lying land and roads close to the river on Monday night. Flooding from surface water, where water gathers and flows off road surfaces, could also occur.
We expect the river to rise and then remain high overnight. Further showers are then forecast on Tuesday.
We have staff attending site who will be closing the Warrengate Road flood gates. We are also constantly monitoring river levels and have staff on standby to attend to any blockages in the river.
This message will be updated on Tuesday morning or earlier if the situation changes.
Information supplied by the Environment Agency
This information last updated 8:10pm, Monday 4th October 2021.
This page is a dedicated URL for a specific message issued at a particular time. You should not bookmark this page, as the current situation may have changed since this message was issued.
Warning no longer in force
Wed 27 Mar 2024, 9:32am
Flood alert
Tue 26 Mar 2024, 7:16pm
Warning no longer in force
Fri 5 Jan 2024, 8:35am
Flood alert
Thu 4 Jan 2024, 9:04pm
Warning no longer in force
Tue 5 Oct 2021, 9:05am
Flood alert
Mon 4 Oct 2021, 8:10pm
The Mimmshall Brook at Warrengate Road including South Mimms, Potters Bar, Brookmans Park and Welham Green
Region: Herts and North London
Country: England
Counties covered: Barnet, Greater London, Hertfordshire
Watercourses covered: Mimmshall Brook
The area bounded in blue on the map shows the area covered by flood alerts and warnings for Mimmshall Brook.
Note: the area shown on the map is the area covered by flood alerts and warnings. It is not a live map of current flooding. The area covered broadly equates to the area where the risk of flooding in any year is greater than 1% (the "hundred year" flood risk).
No current or recent warnings.
No current or recent warnings.
Recent warnings no longer in force.
No current or recent warnings.
No current or recent warnings.