In England, the Environment Agency decides which watercourses are main rivers. It consults with other risk management authorities and the public before making these decisions. The main river map is then updated to reflect these changes.
This is where the Environment Agency amends sections of the main river map to reflect changes in the environment or to correct inaccuracies. These changes only correct the line of the main river and do not change who has legal power to carry out flood risk management work.
Following the public consultation for changes, the Environment Agency takes decisions on whether to transfer flood risk management activities for watercourses, either to a main river or to an ordinary watercourse.
The following list of decisions are part of the Rationalising the Main River Network (RMRN): De-maining proposals.
Designation changes (notices to be live for 30 days)