Main river

Main rivers (Welsh: prif afonydd) are a statutory type of watercourse in England and Wales, usually larger streams and rivers, but also some smaller watercourses. A main river is designated by being marked as such on a main river map, and can include any structure or appliance for controlling or regulating the flow of water in, into or out of a main river. Every other open watercourse in England and Wales is determined by statute as an 'ordinary watercourse'.

This article is about the statutory designation in England and Wales. For other uses, see Main River (disambiguation).
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