If you wish to undertake work on a watercourse you need permission from the appropriate authority.
This depends on whether the watercourse is classed as a:
If the watercourse is classed as a main river you need to apply for consent from the Environment Agency.
The district land drainage bye-laws state that formal agreement must be granted for any works to or within 8 metres of an ordinary watercourse.
If the work you are proposing requires land drainage consent fill in an application form: