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Mapa topográfico River Irwell
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River Irwell
The River Irwell catchment area extends from the moors above Bacup to the Manchester Ship Canal. The climate of the catchment area is wetter than the UK average, with rainfall of 1,456 millimetres (57.3 in) per annum compared to 1,231 millimetres (48.5 in) per annum, and the rivers quickly respond to rainfall. The topography varies considerably, with the upper reaches dominated by the Pennine moors at an altitude of between 350 and 450 metres (1,150 and 1,480 ft) AOD and the bottom of the catchment consisting of relatively flat land, which lies between 20 and 150 metres (66 and 492 ft) AOD. The watercourses are characterised by steep narrow valleys, which contributes to high rates of run-off, as does the underlying solid geology. This comprises Lower Coal Measures overlying Millstone Grit, both of which are classified as minor aquifers which will only hold relatively small amounts of water. The Millstone Grit is, in turn, underlain by limestone rocks from the lower Carboniferous period. The surface deposits comprise thick peat in the upper reaches, with glacial boulder clay and glacial sand and gravel in the lower parts. The sand and gravel are also classified as a minor aquifer, whilst the boulder clay is a non-aquifer. The higher, steeper slopes of the upper part of the catchment provide a large source of erodible material and debris which is transported downstream to the lower, flatter parts of the catchment. Where the channel is constricted, this material is then deposited and can contribute to a reduction in channel capacity.
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Acerca de este mapa
Nombre: Mapa topográfico River Irwell, altitud, relieve.
Altitud media: 178 m
Altitud mínima: 14 m
Altitud máxima: 477 m
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Otros mapas topográficos
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Larbreck
United Kingdom > England > Lancashire > Borough of Fylde > Little Eccleston
Altitud media: 12 m
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Billington and Langho
United Kingdom > England > Lancashire > Ribble Valley > Brockhall Village
Altitud media: 58 m
Old Langho
United Kingdom > England > Lancashire > Ribble Valley > Brockhall Village
Altitud media: 74 m
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Accrington
United Kingdom > England > Lancashire > Hyndburn
Geographical coordinates: 53° 46' 0" North, 2° 21' 0" West. Height above sea level: there is a spot height outside the Market Hall which is 133.5 metres (438 ft) the benchmark on the side of the neighbouring Town Hall is 441.10 feet (134.45 m). The highest height in the town is 320 metres (1,050 ft) which is…
Altitud media: 199 m
Bacup
United Kingdom > England > Lancashire > Borough of Rossendale
The geology and topography of the village lent itself to urbanisation and domestic industries; primitive weavers' cottages, coal pits and stone quarries were propelled by Bacup's natural supply of water power in the Early Modern period. The adoption of the factory system, which developed into the Industrial…
Altitud media: 337 m
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Haslingden Grane
United Kingdom > England > Lancashire > Borough of Rossendale > Haslingden
Altitud media: 287 m
Colne Water
United Kingdom > England > Lancashire > Borough of Pendle > Laneshaw Bridge
Altitud media: 202 m
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Walton Summit
United Kingdom > England > Lancashire > South Ribble > Bamber Bridge
Altitud media: 67 m
Irwell Springs
United Kingdom > England > Lancashire > Borough of Rossendale > Weir
Altitud media: 365 m
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Clowbridge
United Kingdom > England > Lancashire > Borough of Rossendale > Habergham Eaves
Altitud media: 319 m
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Brungerley Park
United Kingdom > England > Lancashire > Ribble Valley > Clitheroe > Waddington
Altitud media: 77 m
Whitewell Bottom
United Kingdom > England > Lancashire > Borough of Rossendale > Sagar Holme
Altitud media: 281 m
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Trough Gate
United Kingdom > England > Lancashire > Borough of Rossendale > Britannia
Altitud media: 341 m
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Forest Holme
United Kingdom > England > Lancashire > Borough of Rossendale > Water
Altitud media: 318 m
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Nun Hills
United Kingdom > England > Lancashire > Borough of Rossendale > Stacksteads
Altitud media: 316 m
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Cowm Reservoir
United Kingdom > England > Lancashire > Borough of Rossendale > Whitworth > Shawforth
Altitud media: 302 m
Rishton
United Kingdom > England > Lancashire > Hyndburn
Rishton is situated in an area of low moorland north east of Blackburn and north west of Accrington. Its elevation above sea level varies from 250 feet (76 m) in the east, where Norden Brook flows into the River Hyndburn, to 785 feet (239 m) on Rishton Height, north west of the town.
Altitud media: 151 m
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