The River Misbourne rises in a field on the outskirts of

Great Missenden Great Missenden is an affluent village with approximately 2,000 residents in the Misbourne Valley in the Chiltern Hills in Buckinghamshire, England, situated between the towns of Amersham and Wendover, with direct rail connections to London Mary ...

Buckinghamshire Buckinghamshire (), abbreviated Bucks, is a ceremonial county in South East England that borders Greater London to the south-east, Berkshire to the south, Oxfordshire to the west, Northamptonshire to the north, Bedfordshire to the north-ea ...

, passing through

Little Missenden Little Missenden is a village and civil parish on the River Misbourne in Buckinghamshire, England. It is in the Chiltern Hills, about southeast of Great Missenden and west of Amersham. The village lies on the River Misbourne in the Misbourne v ...

, Old

Amersham Amersham ( ) is a market town and civil parish within the unitary authority of Buckinghamshire, England, in the Chiltern Hills, northwest of central London, from Aylesbury and from High Wycombe. Amersham is part of the London commuter belt. ...

Chalfont St Giles Chalfont St Giles is a village and civil parish in southeast Buckinghamshire, England. It is in a group of villages called The Chalfonts, which also includes Chalfont St Peter and Little Chalfont. It lies on the edge of the Chiltern Hills, ...

Chalfont St Peter Chalfont St Peter is a large village and civil parish in southeastern Buckinghamshire, England. It is in a group of villages called The Chalfonts which also includes Chalfont St Giles and Little Chalfont. The villages lie between High Wycombe a ...

and under the Chiltern railway line and the

M25 motorway The M25 or London Orbital Motorway is a major road encircling most of Greater London. The motorway is one of the most important roads in the UK and one of the busiest. Margaret Thatcher opened the final section in 1986, making the M25 the lon ...

to its

confluence In geography, a confluence (also: ''conflux'') occurs where two or more flowing bodies of water join to form a single channel. A confluence can occur in several configurations: at the point where a tributary joins a larger river (main stem); o ...

with the River Colne just north of where the Colne is crossed by Western Avenue, the

A40 road A4 most often refers to: *A4 paper, a paper size defined by the ISO 216 standard, measuring 210 × 297 mm A4 and variants may also refer to: Science and mathematics * British NVC community A4 (''Hydrocharis morsus-ranae - Stratiotes aloide ...

. It falls by around in the course of its length.

Etymology

The name ''Misbourne'' is first attested, in the form ''Misseburne'', in 1407. The ''-bourne'' element is agreed to derive from

Old English Old English (, ), or Anglo-Saxon, is the earliest recorded form of the English language, spoken in England and southern and eastern Scotland in the early Middle Ages. It was brought to Great Britain by Anglo-Saxon settlement of Britain, Anglo ...

''burna'' ('stream, river'), but the etymology of the first element is uncertain. It is thought to occur in the names of both

Great Great may refer to: Descriptions or measurements * Great, a relative measurement in physical space, see Size * Greatness, being divine, majestic, superior, majestic, or transcendent People * List of people known as "the Great" *Artel Great (born ...

and

, and also in the

Tring Tring is a market town and civil parish in the Borough of Dacorum, Hertfordshire, England. It is situated in a gap passing through the Chiltern Hills, classed as an Area of Outstanding Natural Beauty, from Central London. Tring is linked to ...

place-name Miswell.

Frank Stenton Sir Frank Merry Stenton, FBA (17 May 1880 – 15 September 1967) was an English historian of Anglo-Saxon England, and president of the Royal Historical Society (1937–1945). The son of Henry Stenton of Southwell, Nottinghamshire, he was edu ...

and

Allen Mawer Sir Allen Mawer (8 May 1879 − 22 July 1942) was an English philologist. A notable researcher of Viking activity in the British Isles, Mawer is best known as the founder of the English Place-Name Society, and as Provost (education), Provost ...

guessed that it came from a hypothetical Anglo-Saxon personal name ''Myrsa'', which they also supposed to be found in the name of

Mursley Mursley is a small village in and also a civil parish in Buckinghamshire, England. It is located about three miles east of Winslow and about seven miles south west of Central Milton Keynes. The village name is Old English in origin, and is thou ...

Eilert Ekwall Bror Oscar Eilert Ekwall (born 8 January 1877 in Vallsjö (now in Sävsjö, Jönköpings län), Sweden, died 23 November 1964 in Lund, Skåne län, Sweden), known as Eilert Ekwall, was Professor of English at Sweden's Lund University from 1909 to ...

suggested that it came from a lost Old English word related to English ''moss'', and to Danish ''mysse'' and Swedish ''missne'' (which denote plants of the genus ''

Calla ''Calla'' (bog arum, marsh calla, wild calla, squaw claw, and water-arumDickinson, T.; Metsger, D.; Bull, J.; & Dickinson, R. (2004) ROM Field Guide to Wildflowers of Ontario. Toronto:Royal Ontario Museum, p. 62.) is a genus of flowering plant i ...

'', such as water arum). Recent researchers have tentatively preferred Ekwall's guess, in which case the name ''Misbourne'' would once have meant something like 'river where water-plants/marsh-plants grow'.A. D. Mills, ''A Dictionary of English Place Names'' (Oxford: Oxford University Press, 1991), p. 330.

History

River Misbourne, M25 Motorway culvert - geograph

In 1906 the

Great Western Railway The Great Western Railway (GWR) was a British railway company that linked London with the southwest, west and West Midlands of England and most of Wales. It was founded in 1833, received its enabling Act of Parliament on 31 August 1835 and ran ...

(GWR) constructed the

Chalfont Viaduct The Chalfont Viaduct (also known as the Misbourne Viaduct) is the first of two five-arch brick railway viaducts on the Chiltern Main Line in south-east England. It is located between and stations. The M25 motorway passes beneath it between ju ...

to carry trains between London and across the river. In the mid-1980s, when the M25 was being constructed, the Misbourne was diverted under the motorway via underground concrete

culvert A culvert is a structure that channels water past an obstacle or to a subterranean waterway. Typically embedded so as to be surrounded by soil, a culvert may be made from a pipe, reinforced concrete or other material. In the United Kingdom ...

s. The route of the motorway was then aligned to pass through the arches of the Chalfont Viaduct.

Flow

The river is a 'perch' stream, flowing over a bed of impermeable material on top of a porous substrate. This state is only quasi-stable since in periods of low rainfall the water table drops below the level of the impermeable layer. If groundworks are then carried out which damage this layer, the river can sink into the porous substrate and disappear. The Misbourne has had intermittently reduced or stopped-flow due to abstraction for domestic supply from the

aquifer An aquifer is an underground layer of water-bearing, permeable rock, rock fractures, or unconsolidated materials (gravel, sand, or silt). Groundwater from aquifers can be extracted using a water well. Aquifers vary greatly in their characterist ...

s feeding it. This has caused its course to be neglected to lead to partial obstruction. When the water company undertook remedial measures to restore the flow, there were episodes of flooding in both Chalfont St Peter and Chalfont St Giles. Subsequent work has restored the integrity of the course. The upper part of the river was dry for over 3 years starting in November 2003 but re-appeared in February 2007 following several months of above-average rainfall which raised the water table.Misbourne starts flowing again (Bucks Free Press article)
/ref>

References

External links

{{DEFAULTSORT:Misbourne, River 1Misbourne Rivers of Buckinghamshire Amersham