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River Giedd
The River Giedd (Welsh: ) is a principal tributary of the River Tawe, Wales. The river runs within the county of Powys and lies almost wholly within the Brecon Beacons National Park (Parc Cenedlaethol Bannau Brycheiniog). This river is perhaps unique in the British Isles in that there are in fact two separate rivers sharing the same name and occupying the same valley but which are not hydrologically connected. The upper Giedd rises on the southern slopes of the Old Red Sandstone mountain, Fan Brycheiniog in the Black Mountain (Y Mynydd Du) and heads south-southwest for about 3 km / 2 mi until, as it enters onto the Carboniferous Limestone outcrop it disappears into its bed. A dry valley continues in the same direction beyond the sinks and, as it crosses the Millstone Grit outcrop, gradually acquires a stream which is joined by others to become the lower Giedd. This separate river flows for about 6 km / 4 miles, passing the small village of Cwmgiedd, to its conflu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Afon Giedd Gorge - Geograph
This is a list of rivers of Wales, organised geographically. It is taken anti-clockwise from the Dee Estuary to the M48 Bridge that separates the estuary of the River Wye from the River Severn. Tributaries are listed down the page in an upstream direction, starting with those closest to the sea. The main stem (or principal) river of a catchment is given, left-bank tributaries are indicated by (L), and right-bank tributaries by (R). Note that, in general usage, the 'left (or right) bank of a river' refers to the left (or right) hand bank as seen when looking downstream. Where a named river is formed by the confluence of two differently named rivers, these are labelled as (Ls) and (Rs) for the left and right forks. A prime example is the formation of the River Taff from the Taf Fawr and the Taf Fechan at Cefn Coed-y-cymmer. The list includes more or less every watercourse named on Ordnance Survey mapping and thus many of the main rivers of Wales (as defined by Natural Resources W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cwmgiedd
Cwmgiedd is a small village beside the River Giedd within the community of Ystradgynlais, Powys, Wales. It lies 22.5 km (15 miles) north-east of Swansea and 253 km (157 miles) west of London. '' The Silent Village'', a 1943 British propaganda film about the destruction by the Nazi occupiers of the Czech village Lidice, was filmed here. See also * John Thomas, Baron Thomas of Cwmgiedd Roger John Laugharne Thomas, Baron Thomas of Cwmgiedd, FLSW (born Carmarthen, 22 October 1947) is a British judge. He served as Lord Chief Justice of England and Wales from 2013 to 2017. He sits in the House of Lords as a crossbencher. Early ... * Swansea Valley References Villages in Powys Ystradgynlais {{Powys-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fforest Fawr
Fforest Fawr (, ) is an extensive upland area in the county of Powys, Wales. Formerly known as the Great Forest of Brecknock in English, it was a royal hunting area for several centuries but is now used primarily for sheep grazing, forestry, water catchment and recreation. It lies within the Brecon Beacons National Park. Extent The area extends from the edge of the Black Mountain (range), Black Mountain in the west eastwards to the A470 road, A470 Brecon to Merthyr Tydfil road, just west of the Brecon Beacons themselves. It includes the peaks of Fan Fawr (734 m), Fan Frynych (629 m), Craig Cerrig-gleisiad (629 m), Fan Llia (632 m), Fan Nedd (663 m), Fan Gyhirych (725 m), Fan Bwlch Chwyth (603 m) and Cefn Cul (562 m). Traditionally Fforest Fawr also included the peaks of Fan Hir and Fan Brycheiniog, although the modern recreational use of the name tends to be restricted to the area east of the Black Mountain of which they form a part. Geology The area is largely underlain b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dye Tracing
Dye tracing is a method of tracking and tracing various flows using dye as a flow tracer when added to a liquid. Dye tracing may be used to analyse the flow of the liquid or the transport of objects within the liquid. Dye tracking may be either qualitative, showing the presence of a particular flow, or quantitative, when the amount of the traced dye is measured by special instruments. Fluorescent dyes Fluorescent dyes are often used in situations where there is insufficient lighting (e.g., sewers or cave waters), and where precise quantitative data are required (measured by a fluorometer). In 1871, fluorescein was among the first fluorescent dyes to be developed. Its disodium salt (under the trademark " uranine") was developed several years later and still remains among the best tracer dyes.An educational website about karst an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swansea Valley
The Swansea Valley (; ) is one of the South Wales Valleys. It is the valley from the Brecon Beacons National Park to the sea at Swansea of the River Tawe in Wales. Administration of the area is divided between the City and County of Swansea, Neath Port Talbot County Borough, and Powys. A distinction may be drawn between the Lower Swansea valley and the Upper Swansea valley; the former was more heavily industrialised during the 19th and 20th centuries. Settlements and transport Towns and villages include Clydach, Pontardawe, Ystradgynlais, Ystalyfera and Abercraf. In its September 2005 document ''Towards a Valleys Strategy'', Neath Port Talbot County Borough Council noted that a marked divide between the more remote communities at Ystalyfera and along the Twrch and Amman valleys and the reasonably prosperous southern communities of Pontardawe, Alltwen, Rhos, and Trebanos. The area has had no rail connection since passenger services on the Swansea Vale Railway line be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ystradgynlais
Ystradgynlais (; ) is a town in southwest Powys, Wales. It is located on the River Tawe, and was within the boundaries of the former county of Brecknockshire. The town has a high proportion of Welsh language-speakers. The community includes Cwmtwrch, Abercraf and Cwmgiedd, with a population of 8,092 in the 2011 census; it is the second-largest town in Powys. It forms part of the Swansea Urban Area where the Ystradgynlais subdivision has a population of 10,248. History The place-name Ystradgynlais, meaning 'vale of the river Cynlais' – Cynlais may be a personal name, or derive from ''cyn'' ('chisel') and ''glais'' ('stream') – is first recorded in 1372. In the 1600s there were only a couple of houses by the church and a pub (now the rectory). In 1801 there were only 993 residents in the town living in only 196 houses. The first documented written evidence of iron working in the area was at Ynyscedwyn and is of a deed of release dated 1729. By 1750 there were seven furnac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Millstone Grit
Millstone Grit is any of a number of coarse-grained sandstones of Carboniferous age which occur in the British Isles. The name derives from its use in earlier times as a source of millstones for use principally in watermills. Geologists refer to the whole suite of rocks that encompass the individual limestone beds and the intervening mudstones as the Millstone Grit Group. The term Millstone Grit Series was formerly used to refer to the rocks now included within the Millstone Grit Group together with the underlying Edale Shale Group. The term gritstone describes any sandstone composed of coarse angular grains, and specifically refers to such sandstones within the Pennines and neighbouring areas of Northern England. Geographical occurrence Rocks assigned to the Millstone Grit Group occur over a wide area of Northern England, where they are a hugely important landscape-forming element of the rock succession. They also occur in parts of northeast Wales and northwest Ireland. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River Tawe
The River Tawe (; ) is a long river in South Wales. Its headwaters flow initially east from its source below Llyn y Fan Fawr south of Glasfynydd Forest, Moel Feity in the Black Mountain (range), Black Mountains, the westernmost range of the Brecon Beacons National Park, before the river turns south and then southwest to its estuary at Swansea. Its main tributaries are the right bank Upper Clydach River, Upper and Lower Clydach Rivers and the Afon Twrch, with Nant-y-fendrod joining on the left bank. The total area of the catchment is some . The Tawe passes through a number of towns and villages including Ystradgynlais, Ystalyfera, Pontardawe, and Clydach, Swansea, Clydach and meets the sea at Swansea Bay below Swansea. The Tawe Valley ( in Welsh language, Welsh) is more commonly known as the Swansea Valley. Ownership of the riverbed was granted to the Duke of Beaufort in the 17th century by Charles II of England, Charles II resulting in exclusive mineral and fishing rights, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
