Outer Trial Bank

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Outer Trial Bank
Outer Trial Bank (aerial).jpg
Type Nature reserve
Location The Wash, East Anglia, England
Coordinates 52°50′30″N 0°14′35″E / 52.8418°N 0.2431°E / 52.8418; 0.2431Coordinates: 52°50′30″N 0°14′35″E / 52.8418°N 0.2431°E / 52.8418; 0.2431
Area 4.265 hectares (10.54 acres)

The Outer Trial Bank is a circular artificial island in the Wash, East Anglia, England. It is one of two islands constructed during the 1970s for a governmental water resources scheme.[1]



In 1972, the Government undertook a study to assess the feasibility of building a tidal barrage across half of the Wash. The idea was to capture the freshwater from the River Witham, River Welland, River Nene and Great Ouse to build a freshwater reservoir.[1] The study also intended to establish potential improvements to the navigation of sea locks, provide recreational facilities and develop an area of land for a power station.[2]

Construction of the banks

As part of the test, the approval to build an artificial island 2 miles (3.2 km) off the Lincolnshire coast was given in November 1974.[3][4] Building work began in February 1975.[3] The bank (known locally as "the doughnut" due to its biconcave shape[4]) was constructed of a sand fill protected by limestone riprap.[3] Measuring 250 metres (820 ft) in diameter, the island contained a small reservoir measuring 1 hectare (2.5 acres) in the centre.

The other trial bank, built before the Outer Trial Bank, is connected to Norfolk by a causeway on Terrington Marsh.[3]


The study, which was published in 1976 as "The Wash storage scheme",[5] found that the trial alone proved financially unfeasible (costing £3 million),[4] and that the freshwater was too close to the tidal estuary to ensure low salinity and minimal silt levels.[1] The trial was soon abandoned and the plans for the scheme shelved.[4]

Present use

The outer bank is a nesting ground for seabirds within the National Nature Reserve of the Wash. In 2008, an estimated 3,000 pairs of birds nested on the island.[1]


  1. ^ a b c d Richards, Matt (8 October 2008). "Investigation of Wash Island". BBC Look North. BBC. Retrieved 1 March 2010.
  2. ^ "The Past". The Wash Project. The Wash Estuary Strategy Group. Archived from the original on 11 October 2006. Retrieved 1 March 2010.
  3. ^ a b c d "Wash Water storage scheme" (PDF). News and Views. British National Committee on Large Dams (16): 15–16. 1975. Retrieved 2 March 2010.
  4. ^ a b c d "Abandoned: What's in the Wash?". BBC Lincolnshire. BBC. 15 October 2008. Retrieved 1 March 2010.
  5. ^ "The Wash storage scheme: report on the feasibility study". Central Water Planning Unit. The National Archives. 1976. Retrieved 1 March 2010.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Outer_Trial_Bank&oldid=832333626"
This content was retrieved from Wikipedia : http://en.wikipedia.org/wiki/Outer_Trial_Bank
This page is based on the copyrighted Wikipedia article "Outer Trial Bank"; it is used under the Creative Commons Attribution-ShareAlike 3.0 Unported License (CC-BY-SA). You may redistribute it, verbatim or modified, providing that you comply with the terms of the CC-BY-SA