SN7987 : Old dam, Llyn Llygad Rheidol

taken 6 months ago, near to Llyn Llygad Rheidol [water Feature], Ceredigion, Great Britain

Old dam, Llyn Llygad Rheidol
Old dam, Llyn Llygad Rheidol
Llyn Llygad Rheidol is a natural glacial lake on the north side of Pumlumon Fawr. It has been dammed several time to provide drinking water for Aberystwyth. During the drought of summer 2018, the water level had dropped enough for the first dam, which is normally submerged, to become visible. The bridge leading, presumably, to the original abstraction valve is also normally under water along with most of the land in the foreground. During the drought, water was taken through a makeshift pipe directly from the middle of the reservoir LinkExternal link .
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
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Date Taken
Thursday, 9 August, 2018   (more nearby)
Submitted
Tuesday, 6 November, 2018
Geographical Context
Uplands  Lakes, Wetland, Bog  Water resources  Air, Sky, Weather  Moorland 
Primary Subject of Photo
Reservoir 
Subject Location
OSGB36: geotagged! SN 7914 8776 [10m precision]
WGS84: 52:28.4609N 3:46.8497W
Camera Location
OSGB36: geotagged! SN 7911 8785
View Direction
South-southeast (about 157 degrees)
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Image Type (about): geograph 
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