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A chart datum is the water level surface serving as origin of depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. [1] Common chart datums are lowest astronomical tide (LAT) [1] and mean lower low water (MLLW).
Major rivers of the United Kingdom. The Severn Bridges crossing near the mouth of the River Severn. The River Thames in London. The River Tay in Perth, by measured flow the largest in Great Britain. This is a list of the major rivers of the United Kingdom, as being prominent in length, flow volume (discharge rate), or both.
Thus, in the first catchment below, the River Sark is the lowermost tributary of the Border Esk and the Hether Burn is the lowermost tributary of the River Lyne. The main stem (or principal) river of a catchment is labelled as (MS), left-bank tributaries are indicated by (L), right-bank tributaries by (R). Note that in general usage, the 'left ...
List of rivers of the United Kingdom. For details of rivers of the United Kingdom, see. List of rivers of England. List of rivers of Scotland. List of rivers of Wales. Northern Ireland: see List of rivers of Ireland and Rivers of Ireland. Longest rivers of the United Kingdom.
View from Newlyn harbour showing the lighthouse and Newlyn Tidal Observatory to its right, both painted red and white. An ordnance datum (OD) is a vertical datum used by an ordnance survey as the basis for deriving altitudes on maps. A spot height may be expressed as above ordnance datum (AOD). Usually mean sea level (MSL) at a particular place ...
The River Douglas, also known as the River Asland or Astland, [1] flows through parts of Lancashire and Greater Manchester in North West England. It is a tributary of the River Ribble and has several tributaries, the major ones being the River Tawd and the River Yarrow. In 1720, an Act of Parliament authorized Thomas Steers and William Squire ...
River Colne, Hertfordshire. The Colne is a river and a tributary of the River Thames in England. Just over half its course is in south Hertfordshire. Downstream, it forms the boundary between Buckinghamshire and the London Borough of Hillingdon. The confluence with the River Thames is on the Staines reach (above Penton Hook Lock) at Staines ...
The River Severn (Welsh: Afon Hafren, pronounced [ˈavɔn ˈhavrɛn]), at 220 miles (354 km) long, is the longest river in Great Britain. [ 4 ] [ 5 ] It is also the river with the most voluminous flow of water by far in all of England and Wales , with an average flow rate of 107 m 3 /s (3,800 cu ft/s) at Apperley , Gloucestershire.