Lea Valley
| Designations | |
|---|---|
| Official name | Lee Valley |
| Designated | 9 October 2000 |
| Reference no. | 1037[1] |
The Lea Valley, the valley of the River Lea, has been used as a transport corridor, a source of sand and gravel, an industrial area, a water supply for London, and a recreational area. The London 2012 Summer Olympics were based in Stratford, in the Lower Lea Valley. It is important for London's water supply, as the source of the water transported by the New River aqueduct, but also as the location for the Lee Valley Reservoir Chain, stretching from Enfield through Tottenham and Walthamstow.
Geography
[edit]Physical geography
[edit]The catchment area of the River Lea is located in the central part of the London Basin, on that basin's northern flank.
The main underlying geological formation of the upper part of the Lea catchment, north of Hoddesdon, is Cretaceous Chalk. The main underlying geological formation of the lower part of the Lea catchment, south of Hoddesdon, is Eocene London Clay.
However, large areas of these formations are overlain by much more recent Quaternary formations, including Clay-with-Flints (on the Chalk), till and other glacial deposits (mostly in the upper part of the catchment), and fluvial sand, gravel and alluvium (in the lower parts of today's valleys, but also on some higher ground in east Hertfordshire, Middlesex and west Essex, where such deposits were laid down by the pre-glacial "proto-Thames"[2] and its former tributaries).[3][4]
The northern boundary of the Lea catchment area rises to an altitude of almost 180 metres, in hills north-east of Luton. The lowest point of the catchment area is the junction of the Lea with the Thames in east London, at an altitude of barely 5 metres.
The relief of the upper part of the Lea catchment is one of gently rolling hills, which are divided by the valleys that fan out to the north and north-west from an area between Hertford and Hoddesdon.
The lower part of the Lea catchment runs from Hoddesdon southwards to east London, with the flood plain of the River Lea as its central feature. That flood plain has a width which extends to about 7 kilometres in Edmonton. From there, the land rises on either side to an altitude of around 120 metres, to gravel-capped plateaus in Hertfordshire (Northaw) and Middlesex (Southgate) to the west, and to Essex (Epping Forest) in the east.[5]
The upper part of the catchment area of the River Lea was formerly a group of valleys whose rivers flowed approximately north–south directly into the River Thames (the "proto-Thames"). Until the Anglian glaciation about 450,000 years ago, the Thames flowed north-eastward past Watford, through what is now the Vale of St Albans, then eastwards towards Chelmsford and the North Sea.[6]
The lower part of today's Lea valley was formed during the Anglian glaciation. During that period, ice from the north of England advanced at least as far south as Watford, Finchley and Chingford. As a result, the River Thames was diverted to a more southerly route, broadly along the line of its current course.
As the ice retreated, the lower part of the River Lea was formed. It flowed almost directly north–south into the newly diverted Thames (see further notes below).
Further north, the newly formed lower Lea was fed by rivers which, as mentioned above, had flowed directly into the proto-Thames prior to the Anglian glaciation. These rivers - the upper Lea, the Mimram, the Beane, the Rib, the Ash and the Stort - today follow courses which are mostly similar to those of their pre-Anglian predecessors.[7]
(Note - the above summary is accurate as far as it goes, but in reality the processes of glaciation and river diversion were more complex than in this summary - for example, four separate ice advances of the Anglian glaciation in this area have been identified.[8])
Further notes on the lower Lea Valley
[edit]Prior to the Anglian glaciation, a "proto-Mole-Wey" river was flowing northwards from the Weald and North Downs, through the "Finchley depression", to join the proto-Thames somewhere around Hoddesdon.[9]
Just prior to the arrival of the Anglian ice sheet in the Thames basin, this proto-Mole-Wey river appears to have been flowing over a wide, low-gradient valley floor between Palmers Green and Hoddesdon at what is today an altitude of around 60 metres.
When the Anglian ice sheet diverted the Thames southwards, the Mole-Wey was cut off at Richmond.[10] As meltwater from the retreating Anglian ice sheet gave birth to the south-flowing lower River Lea, that river cut into and followed the line of the former proto-Mole-Wey, between Hoddesdon and Palmers Green. It flowed into the newly diverted Thames, which at that time was spread over a wide flood plain extending as far north as Islington.[11]
The earliest line of the lower River Lea is indicated by what appear on the BGS 1:50,000 map as deposits of "Boyn Hill gravel", notably at Forty Hill, Bush Hill and Palmers Green (Broomfield Park).[4] These deposits lie at an altitude of approximately 50 metres, just to the east of, and slightly lower than, the lowest gravel deposits left by the proto-Mole-Wey (shown on BGS maps as "Dollis Hill Gravel"[12]).
But the River Lea has clearly moved eastwards since the Boyn Hill terraces were laid down. In fact, the lower Lea Valley has been noted for the striking width of its valley floor, especially the section from Wormley down to Tottenham, as well as for the relative steepness of parts of its eastern slope.
For example, in the London Borough of Enfield, the ground slopes from an altitude of only about 25 metres at the Ridge Avenue library to about 15 metres at the foot of Kings Head Hill, some five kilometres to the east. It then rises to an altitude of 85 metres on the summit of Pole Hill, barely a further one kilometre to the east. Across that five kilometres of valley floor, the ground is mostly covered by river terrace deposits of decreasing altitude and age, thus demonstrating that the lower River Lea has migrated eastwards since it was formed some 400,000 years ago.[13]
Some authors have proposed that the notable width of the lower Lea Valley indicates that it was once occupied by a larger and more powerful river, namely the proto-Thames.[14][15]
However, this hypothesis is not universally supported. In any case, even if all or some of the water being conveyed by the proto-Thames as it flowed north-east through the Vale of St Albans was diverted southwards from around Hoddesdon by an advancing Anglian ice sheet, this could only have been for a brief (geologically speaking) period, because the ice then progressed further to the south and caused the above-mentioned complete diversion of the Thames to its more southerly course of today.[6]
In addition, it is clear that the River Lea alone has been powerful enough to cause significant erosion below the surface across which the Anglian ice sheet flowed and on which it left till and other deposits. A cross-section across the Lea Valley at Enfield shows that the Lea has cut down by as much as 45 metres, over a width of more than six kilometres, since the Anglian glaciation.[16][17]
But why did the River Lea move eastwards? It has been suggested that the River Lea has been "tilted...into its eastern bank" by "a north-south monocline" which was established "at least as early as the beginning of Eocene times".[16][18] Pleistocene isostatic adjustment of the London Basin (with uplift in the west caused by erosion and subsidence in the east caused by accumulation of deposits in the North Sea) may also have played a role.[19]
Human geography
[edit]The northern section of the valley, although including several towns (Luton, Harpenden, Hertford and Ware), is mainly rural. Below Hertford the Lea flows on a wide floodplain, which becomes an increasingly urban transport corridor as it enters Greater London. Many of the upper sections have been exploited for sand, gravel or brickearth, and are now part of the Lee Valley Park.
From Hoddesdon a more or less continuous ribbon development runs south to the west of the river, running through Wormley, Broxbourne, Cheshunt and Waltham Cross to Freezy Water. To the south the wider expanse of Greater London includes the floodplain settlements of Enfield Lock, Enfield Highway, Brimsdown, Ponders End, Edmonton, Tottenham, Tottenham Hale, Clapton, Lea Bridge, Leyton, Hackney Wick, Old Ford, Bow, Stratford, West Ham, Bromley-by-Bow, Canning Town and Leamouth.
A combination of factors led to the development of the valley as an important industrial area. These included, in the early days, distance from London for noxious industries and the availability of water power. Later factors included cheap electrical power from Brimsdown and large expanses of flat land.
History
[edit]Boundary
[edit]In earlier centuries the river Lea and its marshland formed a natural boundary between the historic areas of Middlesex and Essex, some 2 km wide and 20 km long. The river was crossed at several points by fords or ferries, which were eventually replaced by bridges. At Stratford a stone causeway on the Roman road to Colchester was supplemented by bridge in 1100. In 1745 the valley was crossed at Clapton by Lea Bridge.[20] In 1810 an iron bridge was built linking East India Dock Road.[21] In the late 1920s the Lea Valley Viaduct, carrying the North Circular Road, was built to a design by Owen Williams.[22] This was replaced in the 1980s.
Byway
[edit]The valley of the Lea formed a route followed by the New River and Lee Navigation, and roads including the Roman Ermine Street, the Hertford Road (A1010) and the later Great Cambridge Road (A10) and A1055. The valley is also followed by two routes of what became the Great Eastern Railway and had important marshalling yards and locomotive works at Temple Mills.
Industry
[edit]Much early industrialisation was a result of the availability of water power for numerous mills. These include the Waltham Abbey Royal Gunpowder Mills (originally a fulling mill but already producing gunpowder by 1665), the 19th century Royal Small Arms Factory at Enfield and Wright's Flour Mill (Greater London's last surviving working mill) at Ponders End. Further south at Bow is the Three Mills tidal complex.
In the 18th century Bow porcelain factory flourished. In the 19th century the lower Lea became an important area for the manufacture of chemicals, in part based on the supply of by-products such as sulphur and ammonia from the Gas Light and Coke Company's works at Bow Common. Other industries included Bryant and May, Berger Paints, Stratford Railway Works and confectionery manufacturer Clarnico (later Trebor). Where the river meets the Thames were the Orchard House Yard and Thames Ironworks shipyards.
In the 20th century the combination of transport, wide expanses of flat land and electricity from riverside and canal-side plants such as Brimsdown, Hackney, Bow and West Ham led to expansion of industries including for example Enfield Rolling Mills and Enfield Cables, Thorn Electrical Industries, Belling, Glover and Main, MK Electric, Gestetner, JAP Industries, Ferguson Electronics, Hotpoint, Lesney (original makers of Matchbox toys), a Ford components (later Visteon) plant and Johnson Matthey.[23] Much industry has now gone, replaced by warehousing and retail parks.
Small scale farming
[edit]North of Cheshunt the Lea Valley, particularly around Nazeing, is associated with market gardening, nurseries and garden centres. The industry once dominated the area from Ponders End, north through Enfield Lock, Waltham Cross and Cheshunt, to Wormley, Turnford and Nazeing, and spawned industries such as Pan Britannica Industries. In the 1930s the valley contained the largest concentration of greenhouses in the world.[24] Stamp writing in 1948 described how glasshouses, originally established on the 'warm brickearth soils' of Tottenham and Edmonton in the 1880s, had been progressively driven north into the often poorer soils further north by the growth of London. At the same time the growth of industry had intensified the lack of winter sunshine.[25] Today, in most parts south of Cheshunt greenhouses have been replaced by residential areas.
Protection and preservation
[edit]The Lee Valley Park occupies large areas of the valley. An extensive area of open land, built up using rubble from the Blitz, is Hackney Marshes. By contrast, Walthamstow Marshes is retained as a Site of Special Scientific Interest (SSSI).
Further reading
[edit]Author Jim Lewis wrote several books, covering many subjects about the area, ranging from industry to sport.[26]
See also
[edit]Notes and references
[edit]- ^ "Lee Valley". Ramsar Sites Information Service. Retrieved 25 April 2018.
- ^ McGregor, DFM and Green, CP (1983), Lithostratigraphic subdivisions in the gravels of the proto-Thames between Hemel Hempstead and Watford. Proceedings of the Geologists’ Association, 94, pages 83-5.
- ^ See BGS Geology Viewer (British Geological Survey) for more information on the distribution of all the formations mentioned here.
- ^ a b British Geological Survey (BGS) maps at a scale of 1:50,000 which cover most of the Lea Valley can be viewed online at largeimages.bgs.ac.uk/ (Hertford) and largeimages.bgs.ac.uk/ (North London).
- ^ See the online topographic map at en-gb.topographic-map.com/ (London) for more details.
- ^ a b Bridgland, DR and Gibbard, PL (1997), Quaternary River Diversions in the London Basin and the Eastern English Channel, Géographie physique et Quaternaire, vol. 51, n° 3, 1997, pp. 337-346. Online at www.erudit.org/fr/revues/. See in particular Figure 1.
- ^ Brown, Joyce C. (1959), The Sub-Glacial Surface in East Hertfordshire and Its Relation to the Valley Pattern. Transactions and Papers (Institute of British Geographers), 1959, No. 26, pp. 37-50. See in particular Figure 1, Figure 4, and page 49 - "There is seen to be a general correspondence between the present and pre-glacial drainage lines".
- ^ Bridgland, DR and Cheshire, DA (1994), Westmill Quarry, in Bridgland, DR (1994), The Quaternary of the Thames. Chapman & Hall, London.
- ^ Murton, Della K. and Murton, Julian B. (2012), Middle and Late Pleistocene glacial lakes of lowland Britain and the southern North Sea Basin. Quaternary International, Volume 260, 18 May 2012, Pages 115-142, Fig. 7A. Online at coek.info. See also Bridgland, DR and Gibbard, PL (1997), Fig. 3.
- ^ Gibbard, PL (1979), Middle Pleistocene drainage in the Thames Valley, Geological Magazine, Volume 116, Issue 1, January 1979.
- ^ Ellison, RA (2004), Geology of London, British Geological Survey, Fig. 29, p54.
- ^ British Geological Survey - Dollis Hill Gravel Member. See also Gibbard PL (1979).
- ^ The celebrated "Lea Valley Arctic Beds" have been found among the youngest and easternmost of these deposits. These beds, carbon-dated to approximately 28,000 years ago, contained "a distinctive vegetation which has no precise modern equivalent. Known as ‘tundra steppe’ this grassy vegetation covered much of Europe, northern Asia and North America during the Devensian stage (100,000 to 10,000 years ago) and was the main habitat and diet of the woolly mammoth." The Essex Field Club, Pickets Lock and Angel Road Pits (site of) (Lee Valley Arctic Bed). Online at www.essexfieldclub.org.uk
- ^ For example, Ellison RA (2004), page 74.
- ^ See references dating from 1912 cited in Bridgland, DR and Cheshire, DA (1994), "Interpretation".
- ^ a b Wells, AK and Wooldridge SW, Notes on the Geology of Epping Forest, Proceedings of the Geologists' Association, Volume 34, Issue 3, 1923, page 251.
- ^ This downcutting by the River Lea as it moved eastwards lowered the base levels of its tributary streams. This in turn enabled, for example, Pymmes Brook, Salmons Brook and Cuffley Brook, at times of "high discharge, under cold climatic conditions" (Bridgland, DR (1994), The Quaternary of the Thames. Chapman & Hall, London, chapter 1, "Terrace Formation"), to become deeply incised into slopes to the west of the Lea flood plain. This is apparent, for example, in the steep slopes of Pymmes Brook between Cat Hill (Barnet) and Arnos Park, of Salmons Brook between Slades Hill (Enfield) and Grange Park, and of the headwaters of Cuffley Brook in the Cuffley - Newgate Street area.
- ^ Ellison RA (2004), Fig. 45, page 81.
- ^ Bridgland, DR (1994), The Quaternary of the Thames. Chapman & Hall, London, chapter 1, "Terrace Formation".
- ^ 'Hackney: Communications', A History of the County of Middlesex: Volume 10: Hackney (1995), pp. 4–10, retrieved 14 February 2011
- ^ "The Iron Bridge Over The River Lea, 1810 (p. 126)", Survey of London vol=43 and 44: Poplar, Blackwall and Isle of Dogs (1994), pp. XI–XX, retrieved 14 February 2011
- ^ Lea Valley Viaduct, site of, retrieved 14 February 2011
- ^ Jim Lewis 1999, London's Lea Valley, Phillimore, ISBN 1-86077-100-9
- ^ History of the Lea Valley greenhouse industry Retrieved 23 November 2012
- ^ Stamp, Laurence Dudley (1948). The Land of Britain - Its Use and Misuse (1 ed.). London: Longmans, Green & C Ltd. p. 142.
- ^ Books written by Jim Lewis Retrieved 17 July 2015
