Rivelin Dams Claimed

Rivelin Dams two water storage reservoirs situated in the upper part of the Rivelin Valley, 5 miles, (8 km) west of Sheffield. They are named Upper and Lower and fall just within the eastern boundary of the Peak District. The Lower reservoir has a capacity of 175 million imperial gallons (800,000 m³), with a surface area of 12 hectares (30 acres), the dam height is 20 metres (66 feet) and its length is approximately 300 metres (980 feet). The Upper reservoir has a capacity of 48.4 million imperial gallons (220,000 m³), with a surface area of 4 hectares (9.9 acres), the dam height is 12 metres (39 feet) 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. 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 765 hectares (1,890 acres) which has an annual average rainfall of 39.5