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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