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Rivelin Dams
Rivelin Dams are a pair of water storage reservoirs situated in the upper part of the Rivelin Valley, west of Sheffield in South Yorkshire, England. The dams are owned by Yorkshire Water and provide water to 319,000 people〔( Trenchless International.com. ) 319,000 people supplied by Rivelin system.〕 as well as compensation water for the River Rivelin. They are named Upper and Lower and fall just within the eastern boundary of the Peak District.
==Description==
The Lower reservoir is the larger of the two and has easier public access with a tarmac road giving vehicular access to a small car park at the southern end of the dam wall. Access to the Upper reservoir and the woodland around it is by permit, there is a track with a locked gate which gives access for water board vehicles from the A57 road. The Lower reservoir has a capacity of , with a surface area of , the dam height is and its length is approximately . The Upper reservoir has a capacity of , with a surface area of , the dam height is with an approximate length of 220 metres. Both the dam walls are faced with stone pitching in the upstream direction and have grass banking in the downstream direction. In 2005 the dam wall of the Lower reservoir underwent strengthening work undertaken by the firm Hesselberg Hydro who used open stone asphalt to face the upstream embankment.〔(Hesselberg Hydro. ) Gives details of 2005 dam strengthening.〕
The two reservoirs are fed by streams which drain the Hallam Moors which lie to the immediate west and stretch up to Stanage Edge. The reservoirs have a catchment area of which has an annual average rainfall of . A former reservoir keeper's house stands at the northern end of the Lower reservoir's dam wall; this is now a private dwelling.〔(Peak District View. ) Gives some data on reservoirs.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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