Help and guidance on sewers, drains and land drainage Common queries for sewers, drains and land drainage Where can I get advice on sewers and drains? Who is the local land drainage authority? What is land drainage? What are main and ordinary watercourses? Who maintains them? Who owns the watercourse? What are the responsibilities of a riparian owner? How is the operation of the land drainage network maintained? What consents are required for work on watercourses What other legislation applies to ordinary watercourses? What about roadside ditches? What if the legislation does not cover my problem? What are agricultural land tribunals?