SN7987 : Llyn Llygad Rheidol dam

taken 4 years ago, near to Llyn Llygad Rheidol [water Feature], Ceredigion, Great Britain

Llyn Llygad Rheidol dam
Llyn Llygad Rheidol dam
As the lake is a natural feature, the dam LinkExternal link is a fairly simple affair intended to top the level up a little to make it suitable as the main source of drinking water for Aberystwyth [1]. The overflow channel is located at the far end. Pen Cerrig Tewion, a northern spur of Pumlumon Fawr, lies ahead.
1. Drinking water supply for north Ceredigion :: SN6886
North Ceredigion is supplied with drinking water through the water works at Bont-goch SN6886, which are fed with raw water from the Llyn Llygad Rheidol LinkExternal link and Llyn Craig-y-pistyll LinkExternal link reservoirs. The supply is supplemented by stream abstractions from the Maesnant LinkExternal link and the Nant y Moch LinkExternal link as well as two groundwater bore holes near Lovesgrove SN6281.

Llyn Llygad Rheidol is a natural lake in a glacial hollow on the north face of Pumlumon Fawr which has been dammed to increase capacity. Aberystwyth Town Council, then responsible for water supply to the town, built a 16-mile pipeline to transport untreated water from Llyn Llygad Rheidol directly to Aberystwyth in the 1870s.

The separate Aberystwyth Rural District Council, serving the villages of north Ceredigion, took a water supply from the Afon Leri, regulated by their dam at Llyn Craig-y-pistyll. They also built the treatment works at Bont-goch in 1939.

The two local authorities had begun to make joint plans when the responsibility for the water supply was transferred to the new Cardiganshire Water Board in 1962. In 1967, the water board built a new pipeline connecting the two reservoirs, siphoned around the base of the Nant-y-moch hydroelectric reservoir, which had been built between 1957 and 1961. This new pipeline replaced the old direct one to Aberystwyth to allow processing of all drinking water at Bont-goch. LinkExternal link

The water from the two small reservoirs is generally sufficient to supply the needs of north Ceredigion. Dŵr Cymru, the publicly owned water company now in charge of water supply to the area, has a drought plan which establishes that the supply would be topped up by transfers from Nant-y-moch directly into the pipeline linking the two drinking water reservoirs using a temporary installation during a severe drought LinkExternal link . This has not been necessary to date.
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SN7987, 66 images   (more nearby )
Photographer
  (find more nearby)
Date Taken
Sunday, 22 March, 2015   (more nearby)
Submitted
Sunday, 29 March, 2015
Geographical Context
Uplands  Rivers, Streams, Drainage  Lakes, Wetland, Bog  Water resources  Moorland 
Primary Subject of Photo
Dam 
Subject Location
OSGB36: geotagged! SN 7917 8786 [10m precision]
WGS84: 52:28.5152N 3:46.8254W
Camera Location
OSGB36: geotagged! SN 7907 8784
View Direction
East-northeast (about 67 degrees)
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Image classification(about): Geograph
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