Mapa topográfico River Irwell
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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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Fold Head
United Kingdom > England > Lancashire > Borough of Rossendale > Healey
Fold Head, Whitworth, Healey, Borough of Rossendale, Lancashire, England, OL12 8XL, United Kingdom
Altitud media: 294 m
Lancaster
United Kingdom > England > Lancashire
Lancaster, Lancashire, England, United Kingdom
Altitud media: 84 m
Preston
United Kingdom > England > Lancashire
Preston, Lancashire, England, United Kingdom
Altitud media: 58 m
Burnley
United Kingdom > England > Lancashire
Burnley, Lancashire, England, United Kingdom
Altitud media: 247 m
Lower Bartle
United Kingdom > England > Lancashire > Preston > Woodplumpton
Lower Bartle, Woodplumpton, Preston, Lancashire, England, PR4 0RX, United Kingdom
Altitud media: 30 m
Chorley
United Kingdom > England > Lancashire
Chorley, Lancashire, England, United Kingdom
Altitud media: 113 m
Rivington Pike
United Kingdom > England > Lancashire > Horwich
Rivington Pike, Georges Lane, Rivington, Horwich, Chorley, Lancashire, Greater Manchester, England, BL6 6RU, United Kingdom
Altitud media: 270 m
White Coppice
United Kingdom > England > Lancashire > Chorley
White Coppice, Anglezarke, Chorley, Lancashire, England, PR6 9DB, United Kingdom
Altitud media: 184 m
Lancaster Canal
United Kingdom > England > Lancashire
Lancaster Canal, Lancashire, England, United Kingdom
Altitud media: 98 m
Borough of Fylde
United Kingdom > England > Lancashire
Borough of Fylde, Lancashire, England, United Kingdom
Altitud media: 13 m
Hardhorn
United Kingdom > England > Lancashire > Borough of Wyre
Hardhorn, Borough of Wyre, Lancashire, England, FY6 8DN, United Kingdom
Altitud media: 13 m
Little Thornton
United Kingdom > England > Lancashire > Borough of Wyre
Little Thornton, Borough of Wyre, Lancashire, England, FY5 5LU, United Kingdom
Altitud media: 8 m
Borough of Rossendale
United Kingdom > England > Lancashire
Borough of Rossendale, Lancashire, England, United Kingdom
Altitud media: 273 m
Silverdale
United Kingdom > England > Lancashire > Lancaster
Silverdale, Lancaster, Lancashire, England, United Kingdom
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Samlesbury
United Kingdom > England > Lancashire > South Ribble
Samlesbury, South Ribble, Lancashire, England, United Kingdom
Altitud media: 58 m
Arkholme
United Kingdom > England > Lancashire > Lancaster
Arkholme, Lancaster, Lancashire, England, LA6 1RA, United Kingdom
Altitud media: 57 m
Read
United Kingdom > England > Lancashire > Ribble Valley
Read, Ribble Valley, Lancashire, England, United Kingdom
Altitud media: 114 m
Stodday
United Kingdom > England > Lancashire > Lancaster
Stodday, Aldcliffe-with-Stodday, Lancaster, Lancashire, England, LA2 0AG, United Kingdom
Altitud media: 26 m
Over Kellet
United Kingdom > England > Lancashire > Lancaster
Over Kellet, Lancaster, Lancashire, England, United Kingdom
Altitud media: 69 m
Whitewell Bottom
United Kingdom > England > Lancashire > Borough of Rossendale > Sagar Holme
Whitewell Bottom, Sagar Holme, Borough of Rossendale, Lancashire, England, BB4 9DE, United Kingdom
Altitud media: 281 m
Hayshaw Fell
United Kingdom > England > Lancashire > Lancaster
Hayshaw Fell, Over Wyresdale, Lancaster, Lancashire, England, LA2 9DW, United Kingdom
Altitud media: 226 m
Gisburn
United Kingdom > England > Lancashire > Ribble Valley
Gisburn, Ribble Valley, Lancashire, England, United Kingdom
Altitud media: 160 m
Old Langho
United Kingdom > England > Lancashire > Ribble Valley > Brockhall Village
Old Langho, Billington and Langho, Brockhall Village, Ribble Valley, Lancashire, England, BB6 8AP, United Kingdom
Altitud media: 74 m
Wray-with-Botton
United Kingdom > England > Lancashire > Lancaster
Wray-with-Botton, Lancaster, Lancashire, England, United Kingdom
Altitud media: 261 m
Parlick
United Kingdom > England > Lancashire > Borough of Wyre
Parlick, Borough of Wyre, Lancashire, England, PR3 2NZ, United Kingdom
Altitud media: 251 m
Warton Crag
United Kingdom > England > Lancashire > Lancaster > Warton
Warton Crag, Trig Point to Cleft Stone, Warton, Lancaster, Lancashire, England, LA5 9NE, United Kingdom
Altitud media: 45 m
Billington and Langho
United Kingdom > England > Lancashire > Ribble Valley > Brockhall Village
Billington and Langho, Brockhall Village, Ribble Valley, Lancashire, England, United Kingdom, Chew Bank Wood
Altitud media: 58 m
Lytham St Annes
United Kingdom > England > Lancashire > Borough of Fylde
Lytham St Annes, Borough of Fylde, Lancashire, England, FY8 4AR, United Kingdom
Altitud media: 5 m
Brungerley Park
United Kingdom > England > Lancashire > Ribble Valley > Clitheroe > Waddington
Brungerley Park, Clitheroe, Waddington, Ribble Valley, Lancashire, England, United Kingdom
Altitud media: 77 m
Warton Bank
United Kingdom > England > Lancashire > Borough of Fylde > Warton
Warton Bank, Bryning-with-Warton, Warton, Borough of Fylde, Lancashire, England, PR4 1TB, United Kingdom
Altitud media: 8 m
West Lancashire
United Kingdom > England > Lancashire
West Lancashire, Lancashire, England, United Kingdom
Altitud media: 30 m
Forest of Bowland AONB
United Kingdom > England > Lancashire
Forest of Bowland AONB, Lancashire, England, United Kingdom
Altitud media: 201 m
Leyland
United Kingdom > England > Lancashire > South Ribble
Leyland, South Ribble, Lancashire, England, PR25 2EX, United Kingdom
Altitud media: 41 m
Billington
United Kingdom > England > Lancashire > Ribble Valley
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Altitud media: 89 m
Ewood Bridge
United Kingdom > England > Lancashire > Borough of Rossendale
Ewood Bridge, Borough of Rossendale, Lancashire, England, BB4 6LZ, United Kingdom
Altitud media: 226 m
Whitewell
United Kingdom > England > Lancashire > Ribble Valley
Whitewell, Bowland Forest Low, Ribble Valley, Lancashire, England, BB7 3AT, United Kingdom
Altitud media: 184 m
Ormskirk
United Kingdom > England > Lancashire > West Lancashire
Ormskirk, West Lancashire, Lancashire, England, L39 2XN, United Kingdom
Altitud media: 39 m
Brookhouse
United Kingdom > England > Lancashire > Lancaster
Brookhouse, Lancaster, Lancashire, England, LA2 9PA, United Kingdom
Altitud media: 82 m
Capernwray
United Kingdom > England > Lancashire > Lancaster
Capernwray, Over Kellet, Lancaster, Lancashire, England, LA6 1AE, United Kingdom
Altitud media: 60 m
Farington Moss
United Kingdom > England > Lancashire > South Ribble
Farington Moss, South Ribble, Lancashire, England, PR26 6RD, United Kingdom
Altitud media: 36 m
Walton-le-Dale
United Kingdom > England > Lancashire > South Ribble
Walton-le-Dale, South Ribble, Lancashire, England, PR5 4BA, United Kingdom
Altitud media: 31 m
River Brock
United Kingdom > England > Lancashire > Borough of Wyre
River Brock, Borough of Wyre, Lancashire, England, United Kingdom
Altitud media: 111 m
Poulton-le-Fylde
United Kingdom > England > Lancashire > Borough of Wyre
Poulton-le-Fylde, Borough of Wyre, Lancashire, England, FY6 7BL, United Kingdom
Altitud media: 12 m
Ash
United Kingdom > England > Lancashire > Preston
Ash, Water Head, Lane Ends, Ashton-on-Ribble, Preston, Lancashire, England, PR2 3TU, United Kingdom
Altitud media: 28 m
Eccleston
United Kingdom > England > Lancashire > Chorley
Eccleston, Chorley, Lancashire, England, PR7 5TE, United Kingdom
Altitud media: 36 m
Clowbridge
United Kingdom > England > Lancashire > Borough of Rossendale > Habergham Eaves
Clowbridge, Habergham Eaves, Borough of Rossendale, Lancashire, England, United Kingdom
Altitud media: 319 m
Euxton
United Kingdom > England > Lancashire > Chorley
Euxton, Chorley, Lancashire, England, United Kingdom
Altitud media: 50 m
Heskin
United Kingdom > England > Lancashire > Chorley
Heskin, Chorley, Lancashire, England, United Kingdom
Altitud media: 56 m
Brindle
United Kingdom > England > Lancashire > Chorley
Brindle, Chorley, Lancashire, England, United Kingdom
Altitud media: 114 m
Clayton-le-Woods
United Kingdom > England > Lancashire > Chorley
Clayton-le-Woods, Chorley, Lancashire, England, United Kingdom
Altitud media: 72 m