- River Lambourn
The River Lambourn is a
chalk streamin the English county of Berkshire. It rises in the Berkshire Downsnear its namesake village of Lambournand is a tributaryof the River Kennet.
The upper reaches of the river are seasonal, with a perennial source derived from a number of springs located upstream of the village of
Great Shefford. At times when the water tablein the chalk aquiferfeeding the river is high (usually between November and March) the source of the river migrates upstream. The normal seasonal source of the river is from springs in Lynch Wood on the edge of the village of Lambourn, but when groundwaterlevels are exceptionally high the source migrates even further upstream to the hamlet of Upper Lambourn.
Along the winterbourne section of the river are located the villages of Eastbury and
East Garston, while along the perennial section of the river are the villages of Great Shefford, Welford, Boxford, Bagnor, Donnington and Shaw. Below Shaw is the confluence of the River Lambourn with the River Kennet, located between Newbury and Thatcham.
The River Lambourn itself has a single perennial tributary, the
Winterbourne Stream, which joins it at the village of Bagnor.
The River Lambourn is almost unique for a chalk stream in southern England in that its flow regime remains near-natural in form; not being significantly modified by groundwater abstraction. Ironically, this situation developed because of a major groundwater abstraction project. In the 1960s the long term water supply situation for London was regarded as vulnerable and one avenue investigated to rectify this was to use untapped water resources naturally stored in the chalk aquifer of low population density areas of south east England. One such area was the West Berkshire Downs, including the catchment of the River Lambourn. The plan was to abstract groundwater from the chalk aquifer during times of drought and then use the existing river system as a natural conduit to transport the water to London, via the River Kennet and the River Thames.Fact|date=March 2007
An area in the catchment of the River Lambourn was selected as a pilot study to assess the feasibility of the project, and the Lambourn Valley Pilot Scheme was undertaken between 1967 and 1970. The final conclusion from the pilot study was that the overall scheme appeared feasible and a significant number of large abstraction boreholes and observation boreholes, together with pipelines and control equipment, were installed in the Lambourn catchment and also in other nearby river catchments. The project, named the Thames Groundwater Scheme, was completed in 1976 to coincide with the most serious drought in 50 years, but on final testing of the scheme it was found that the effective increase in river flow downstream was minimal, and essentially the project was a failure.Fact|date=March 2007
Almost all of the infrastructure for the project (now known as the West Berkshire Groundwater Scheme) is still in place and maintained, albeit on a rather shoestring budget. But the lasting legacy of the scheme is that the catchment has been preserved as a near-natural groundwater system, almost totally unaffected by groundwater abstractions. This factor made it an ideal candidate for selection as one of the flagship research sites for the
NERC LOCARresearch project investigating permeable (i.e. groundwater dominated) catchments.Fact|date=March 2007
Rivers of Great Britain
Wikimedia Foundation. 2010.
Look at other dictionaries:
Lambourn — infobox UK place country = England official name = Lambourn lieutenancy england = Berkshire civil parish = Lambourn unitary england = West Berkshire region = South East England constituency westminster = Newbury post town = HUNGERFORD postcode… … Wikipedia
River Kennet — The upper reaches of the River Kennet near AveburyThe Kennet is a river in the south of England, and a tributary of the River Thames. The lower reaches of the river are navigable to river craft and are known as the Kennet Navigation, which,… … Wikipedia
Newbury, Berkshire — Coordinates: 51°24′03″N 1°19′25″W / 51.4009°N 1.3235°W / 51.4009; 1.3235 … Wikipedia
Berkshire — For other uses, see Berkshire (disambiguation). Berkshire County Council Coat of Arms 1947 – 1974  … Wikipedia
Chilton Foliat Meadows — (grid reference SU315703) is a 54.6 hectare biological Site of Special Scientific Interest in the civil parish of Chilton Foliat in the English county of Wiltshire. It was notified in 1971 and is split across Berkshire and Wiltshire. Source… … Wikipedia
Eastbury, Berkshire — infobox UK place country = England official name = Eastbury civil parish = Lambourn lieutenancy england = Berkshire unitary england = West Berkshire region = South East England constituency westminster = Newbury os grid reference = SU347771… … Wikipedia
List of Special Areas of Conservation in England — The following is a list of Special Areas of Conservation in England* Arnecliff and Park Hole Woods * Asby Complex * Ashdown Forest * Aston Rowant * Avon Gorge Woodlands * Barnack Hills and Holes * Baston Fen * Bath and Bradford on Avon Bats *… … Wikipedia
Boxford, Berkshire — infobox UK place country = England static static image caption = The mill at the centre of the village latitude= 51.441 longitude= 1.38 official name= Boxford population= 501 os grid reference= SU429715 lieutenancy england= Berkshire unitary… … Wikipedia
Decoy Pit, Pools and Woods — is a 20.27 hectare (50.08 acre) Site of Special Scientific Interest (SSSI) at Aldermaston Wharf in the civil parish of Aldermaston in the English county of Berkshire, notified in 1993. Located at grid reference SU612632, the site comprises… … Wikipedia
Newbury bypass — The Newbury bypass near Donnington The Newbury bypass, officially known as The Winchester Preston Trunk Road (A34) (Newbury Bypass), is a 9 mile (14 km) stretch of dual carriageway road which bypasses the town of Newbury in Berkshire,… … Wikipedia