Local Flood Risk Management Strategy
We have a duty to co-ordinate flood risk management within the borough and to ensure that certain flood risks are identified and managed appropriately.
Merton’s Local Flood Risk Management Strategy sets out our plan for managing local flood risk across the borough until 2020.
Following a public consultation, Merton’s Local Flood Risk Management Strategy was formally adopted on 28 May 2015.
Investigating significant flooding events
We have a duty to investigate and publish the findings of any significant flood events within Merton.
All reported flooding incidents require a formal flood investigation and will be recorded in our Flood Incident Database. This allows us to improve our understanding of flood risk and flooding mechanisms across Merton.
Managing ordinary watercourse activities
We make sure that watercourses are kept clear of obstructions to prevent flooding. This involves giving consent for work to be carried out and we will take enforcement action if work is unacceptable. In Merton the following rivers are defined as Main Rivers and fall under the responsibility of the Environment Agency:
- River Wandle
- Beverley Brook
- Pyl Brook (inc. East Branch)
- River Graveney
- Bunce’s Ditch
- The Pickle
- Wandle Park Ditch
- Figges Marsh Ditch
All other watercourses are classed as Ordinary Watercourses and fall under the responsibility of Merton LLFA.
If you own land above or with a watercourse running through it, you are a ‘riparian owner’ and have responsibilities. You must make sure that the watercourse is maintained and all obstructions (natural or otherwise) are cleared so the normal flow of water is not blocked..
If you want to do any any works to an ordinary watercourse you will need our permission before starting work. See
consent for works affecting a watercourse consent for works affecting a watercourse.
Flood risk management plans and maps
We produced our first Preliminary Flood Risk Assessment in 2011