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Ordinary watercourses are deemed to be all rivers and streams and all ditches, drains, cuts,
culverts, dikes, sluices, sewers (other than public sewers vested with utilities) and passages,
through which water flows that are not classified as Main River by the Environment Agency.
For more information, please see here.
The depiction of Ordinary Watercourses on this map is based on the best currently available data and should be taken as a guide rather than a definitive record. Not all ordinary watercourses may be shown and some alignments may be incorrectly mapped, especially where watercourses in built up areas are extensively cultivated. As the definition of an Ordinary Watercourse is based on a physical description rather than being documented on a map they, unlike Main Rivers, may not all be mapped. The record of Ordinary Watercourses will be updated as errors and omissions come to light. The status of watercourse may change over time if they are added to or removed from the map of Main Rivers maintained by the Environment Agency or due to changes to the public sewer inventories of Anglian Water and Thames Water Utilities Ltd.