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	Types of watercourses
	Main rivers – include rivers and watercourses that form part of the main drainage network. Ordinary watercourses – watercourses other than main rivers (e.g. minor ditches and streams).   Culvert – a main river or an ordinary watercourse that has been diverted underground (for instance, under houses and roadways). Major Watercourses in Spelthorne, classification and responsibility Watercourse Classification Management responsibility Maintenance responsibility River Thames River Wraysbury River Colne River Ash Main river Environment Agency Riparian owners Sweeps Ditch Main river Environment Agency Riparian owners Moor Lane Ditch Ordinary watercourse Environment Agency Spelthorne Borough Council Riparian owners Stanwell Moor Ditch Ordinary watercourse Environment Agency Spelthorne Borough Council Riparian owners Feltham Hill Brook Mixed main river and ordinary watercourse Environment Agency Spelthorne Borough Council Riparian owners Sunbury Ditch “Markway” Ordinary watercourse Environment Agency Spelthorne Borough Council Riparian owners Black Ditch Ordinary watercourse Environment Agency Spelthorne Borough Council Riparian owners West Bedfont Ditch Main river Environment Agency Riparian owners

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