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Main rivers (Welsh: prif afonydd [1]) 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.
Ordinary watercourses include every river, stream, ditch, drain, cut, dyke, sluice, sewer (other than a public sewer) and passage through which water flows and which does not form part of a main river.
The Environment Agency has powers to manage flood control on main rivers, which are defined by a series of statutory main river maps, and for water quality on all watercourses. Responsibility for watercourses other than the main rivers resides with Internal Drainage Boards (IDBs). [37] The Rother is a main river below Mayfield. [38]
The weir at Watercress Farm marks the start of the formal statutory main river designation of the Land Yeo. Flowing west past the Tyntesfield Estate it has been diverted north and embanked into higher ground around what is now the Barn Public House. The original much smaller channel is still fed via a sluice through the water meadows.
Severn Trent Water Authority was one of ten regional water authorities established in 1974. Its area of operation was the catchments of the River Trent and River Severn.It assumed the powers and responsibilities of existing water supply authorities in those catchment areas, the Severn River Authority, the Trent River Authority and the sewage and sewage disposal responsibilities of the councils ...
Under the Land Drainage Act 1930, the authority was responsible for the maintenance of what are still termed main rivers which, as the name implies, were the most important stretches of water channels within its area. The total length of statutory main river which the authority was responsible for was 905 miles [1,445 km].
The longest rivers of the United States include 38 that have main stems of at least 500 miles (800 km) long. The main stem is "the primary downstream segment of a river, as contrasted to its tributaries". [ 1 ]
List of longest rivers of the United States (by main stem) List of longest rivers of the United States by state; List of rivers of the United States by discharge; List of National Wild and Scenic Rivers; List of river borders of U.S. states; List of rivers of U.S. insular areas; List of rivers of the Americas by coastline