Island Barn Reservoir

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Island Barn Reservoir
Islandbarn02.JPG
Sailing Club at Island Barn
Island Barn Reservoir is located in Surrey
Island Barn Reservoir
Island Barn Reservoir
LocationElmbridge, Surrey
Coordinates51°23′26″N 0°21′48″W / 51.39056°N 0.36333°W / 51.39056; -0.36333Coordinates: 51°23′26″N 0°21′48″W / 51.39056°N 0.36333°W / 51.39056; -0.36333
Typereservoir
Basin countriesUnited Kingdom
Surface area122 acres (0.49 km2)
Water volume4.5 Gl (0.99×10^9 imp gal)

The Island Barn Reservoir lies south of the River Thames in England at West Molesey and north of Lower Green, Esher.[1] The reservoir is 122 acres (0.49 km2) large with a capacity of 992 million gallons and is managed by Thames Water. It is within the borough of Elmbridge and is surrounded by the River Mole to the west and the River Ember to the east. Queen Elizabeth II Reservoir is a larger reservoir to the West.

History[]

Island Barn Reservoir was authorized by the Lambeth Water Act 1900 (63 & 64 Vict. c. cxli) .[2] It was built by Sir Robert McAlpine[3] for the Metropolitan Water Board, and opened in 1911.[4] The contract was valued at £152,727.

Construction[]

The embankment walls have a puddle clay core extending down through a gravel layer to the underlying blue London clay. The outside face of the embankment is grassed, the inner face is lined with concrete slabs.[5]

The key dimensions of the Island Barn reservoir are as follows.[6][7][5][8]

Parameter Value
Capacity 900 million gallons (4,091 Ml)
Surface area 121 acres (49 ha)
Perimeter 1 mile 1,200  yards (2,707 m)
Base to top of bank 35 ft (10.7 m)
Base to top water level 30 ft (9.1 m)
Height of bank 24 ft to 34 ft (7.3 to 10.4 m)
Depth of puddle core 15 ft to 25 ft (4.57 to 7.62 m)
Embankment volume 1.27 million tonnes
Maximum height of water 17.59 m AOD

Operation[]

Raw water, from the River Thames, is pumped 2.7 km through a 54 inch (1.34 m) diameter pipeline from the pump house at Walton Water Works adjacent to the Knight reservoir. The reservoir can also be filled by gravity from the Bessborough and Knight reservoirs.[5]

The reservoir allows some settlement of suspended solids; biological cleaning through exposure to sunlight; and provides a buffer storage volume to maintain capacity at times of low flow in the river.

Water is supplied to the Surbiton water treatment works.[5]

For several years leakage through the embankment had been observed.[9] A survey identified three areas of leakage. In 2017 interlocking sheet piling 18.5 m long was driven vertically through the centre of the embankment into the London clay to stop the leakage.[9]

Between 1992 and 1998 1.3 million tonnes of gravel were removed from the base of the reservoir.[5]

Sailing Club[]

Island Barn Reservoir Sailing Club hosts dinghy sailing races and training at the reservoir. Among many successful current and past members has been Fireball world champion and ISO designer John Caig and British Olympic, European Champion and World Cup sailor Nicola Groves.

The reservoir is a bird watching site[10] and Black-necked grebes have been sighted here.[11]

Gallery[]

  • Outlet towers at Island Barn Reservoir

  • Interior from the Sailing Club

See also[]

References[]

  1. ^ Island Barn Reservoir Sailing Club
  2. ^ "Lambeth Water Act 1900". legislation.gov.uk. Retrieved 24 June 2020.
  3. ^ "Opening Ceremony, 4 November 1911". Island Barn Reservoir Sailing Club. Retrieved 25 October 2016.
  4. ^ A Guide to the Industrial Archaeology of the Borough of Elmbridge
  5. ^ a b c d e "Island Barn Reservoir". Engineering timelines.
  6. ^ "London Water Supply". The Times. 13 January 1909.
  7. ^ "New London Storage Reservoir". The Times. 6 November 1911.
  8. ^ There are differences in the data from the various sources
  9. ^ a b "Island Barn Reservoir Remedial Works". Water Projects. Retrieved 24 June 2020.
  10. ^ Surrey Bird Club Recent Sightings, including IB Reservoir
  11. ^ Thames Water official website - Birdwatching
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