water supply
Water supply is the provision of water by public utilities, commercial organisations, community endeavors or by individuals, usually via a system of pumps and pipes. Public water supply systems are crucial to properly functioning societies. Th ...
London
London is the capital and List of urban areas in the United Kingdom, largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary dow ...
Wraysbury
Wraysbury is a village and civil parish in the Royal Borough of Windsor and Maidenhead in England. It is under the western approach path of London Heathrow airport. It is located on the east bank of the River Thames, roughly midway between Winds ...
, and directly under the western approach path of
Heathrow Airport
Heathrow Airport (), called ''London Airport'' until 1966 and now known as London Heathrow , is a major international airport in London, England. It is the largest of the six international airports in the London airport system (the others be ...
. The reservoir was begun in 1967 and completed by W. & C. French in 1970 with a capacity of 34,000 million litres (8,000 million gallons).
Engineering design data for the Wraysbury reservoir is as follows.
The reservoir is owned and operated by
Thames Water
Thames Water Utilities Ltd, known as Thames Water, is a large private utility company responsible for the public water supply and waste water treatment in most of Greater London, Luton, the Thames Valley, Surrey, Gloucestershire, north W ...
; 400 million litres (100 million gallons) of water are pumped daily from an inlet at
Datchet
Datchet is a village and civil parish in the Royal Borough of Windsor and Maidenhead in Berkshire, England, located on the north bank of the River Thames. Historically part of Buckinghamshire, and the Stoke Hundred, the village was eventual ...
on the
River Thames
The River Thames ( ), known alternatively in parts as the The Isis, River Isis, is a river that flows through southern England including London. At , it is the longest river entirely in England and the Longest rivers of the United Kingdom, se ...
. A neighbouring reservoir is the King George VI Reservoir, opened in 1947, which is supplied from
Hythe End
Wraysbury is a village and civil parish in the Royal Borough of Windsor and Maidenhead in England. It is under the western approach path of London Heathrow airport. It is located on the east bank of the River Thames, roughly midway between Winds ...
. To keep the grass short and make inspections easier, Thames Water maintains a flock of
sheep
Sheep or domestic sheep (''Ovis aries'') are domesticated, ruminant mammals typically kept as livestock. Although the term ''sheep'' can apply to other species in the genus '' Ovis'', in everyday usage it almost always refers to domesticate ...
on the earthen banks.
The reservoir is the site of the National Physical Laboratory's Open-Water Test Facility, used by the
Ministry of Defence
{{unsourced, date=February 2021
A ministry of defence or defense (see spelling differences), also known as a department of defence or defense, is an often-used name for the part of a government responsible for matters of defence, found in state ...
for test and calibration of sonar systems, as well as civilian commercial customers.
It is a biological
Site of Special Scientific Interest
A Site of Special Scientific Interest (SSSI) in Great Britain or an Area of Special Scientific Interest (ASSI) in the Isle of Man and Northern Ireland is a conservation designation denoting a protected area in the United Kingdom and Isle ...
and part of South West London Waterbodies
Ramsar site
A Ramsar site is a wetland site designated to be of international importance under the Ramsar Convention,8 ha (O)
*** Permanent 8 ha (P)
*** Seasonal Intermittent < 8 ha(Ts)
**
Special Protection Area
A Special Protection Area (SPA) is a designation under the European Union Directive on the Conservation of Wild Birds. Under the Directive, Member States of the European Union (EU) have a duty to safeguard the habitats of migratory birds and certa ...
. It has nationally important numbers of wintering
cormorants
Phalacrocoracidae is a family of approximately 40 species of aquatic birds commonly known as cormorants and shags. Several different classifications of the family have been proposed, but in 2021 the IOC adopted a consensus taxonomy of seven gen ...
,
great crested grebe
The great crested grebe (''Podiceps cristatus'') is a member of the grebe family of water birds noted for its elaborate mating display.
Taxonomy
The great crested grebe was formally described by the Swedish naturalist Carl Linnaeus in 1758 in t ...
gadwall
The gadwall (''Mareca strepera'') is a common and widespread dabbling duck in the family Anatidae.
Taxonomy
The gadwall was first described by Carl Linnaeus in his landmark 1758 10th edition of ''Systema Naturae''. DNA studies have shown that ...