River Syfynwy

River Syfynwy is a river within Pembrokeshire, rising in the Preseli Hills, feeding the Rosebush and Llys y Fran reservoirs and joining the Eastern Cleddau to the south. It is a river considered to be important as an ecological indicator and part is in a site of special scientific interest; the river is formed by the confluence of several streams rising in the southern slopes of the Preseli Hills at some 350 metres and flows southwards into Rosebush Reservoir, where it passes through or over the dam. Cascades, Syfynwy Falls, are below the dam and are a visitor attraction when the reservoir is overflowing. Continuing south west, the river flows through a wooded valley - Holmus Wood, Farthing's Hook Wood and Dan-y-Coed under the Grade II-listed Farthing's Hook Bridge, it runs between Pen-yr-Allt Wood and Velindre Wood before entering the northern end of Llys y Fran reservoir. This reservoir's dam produces electricity. After the dam, the river flows in a more southerly direction before turning south east, passing under Step-aside Bridge, near Clarbeston, the 18th century Grade II-listed Gelli Bridge at Gelli Hill to meet the Eastern Cleddau.

The river is 10 miles long. The river has been used by some researchers as an indicator of ecological health and is included in the River Cleddau catchment area's Site of Special Scientific Interest for its wide range of indigenous wild plants and animals, including water crowfoot and otter; the Syfynwy is included in the Eastern Cleddau Special Area of Conservation. In 2009 the Bro Syfynwy Heritage Group were granted £2,750 to produce a leaflet covering rural and historical life around the upper Syfynwy; the Llys y Fran Catchment Project is an ecological study based on the Afon Syfynwy catchment from its source to the Llys y Fran dam. The study, begun in July 2014, is focussed on understanding the blue green algae blooms that have been occurring in the reservoir and, with the support of landowners, will involve soil sampling and nutrient management; the project is being run in collaboration with Natural Resources Wales. As well as farming, the project will consider the impact of sewage and forestry on the study area as well as water quality and invertebrate populations.

Over the winter of 2013-14 Pembrokeshire Rivers Trust monitored riverflies at Gelli Bridge as part of a wider study of the Eastern Cleddau catchment area. They found fewer numbers than usual. A pollution incident in 1999 where trade effluent was discharged into the river causing the death of an estimated 1,000 brown trout resulted in a fine of £2,500 and £13,021 costs when the case went to court the following year. During the war the railway at Glan Syfynwy, near Rosebush, was used for bombing practice by the RAF and USAF. List of rivers of Wales#Cleddau catchment List of bridges in Wales

List of Billboard number-one singles from 1950 to 1958

This article is about the US number-one songs chart from 1950–1958. Billboard number-one singles charts preceding the Billboard Hot 100 were updated weekly by Billboard magazine and the leading indicator of popular music for the American music industry since 1940 and until the Billboard Hot 100 chart was established in 1958. Before the Billboard Hot 100 chart was established in August 1958, Billboard used to publish several weekly charts. Throughout most of the 1950s, the magazine published the following three charts to measure a song's popularity: Best Sellers in Stores – ranked the biggest selling singles in retail stores, as reported by merchants surveyed throughout the country. Most Played by Jockeys – ranked the most played songs on United States radio stations, as reported by radio disc jockeys and radio stations. Most Played in Jukeboxes -- ranked. At that time, this chart used to be one of the most important channels for measuring the popularity of a song among the younger generation of listeners, as many US radio stations resisted adding rock and roll music to their playlists for many years.

The chart shown in this article comes from the Best Sellers in Stores chart only. Key ♪ – Number-one single of the year The following artists achieved three or more number-one hits during the 1950–1958. A number of artists had number-one singles on their own as well as part of a collaboration; the following artists were featured in top of the chart for the highest total number of weeks during the 1950–1958. The following songs were featured in top of the chart for the highest total number of weeks during the 1950–1958. List of Billboard number-one singles 1950s in music