Happy Valley Reservoir Totally Explained

Everything about Happy Valley Reservoir totally explained

Happy Valley Reservoir is one of the oldest reservoirs in South Australia, having been built between 1892 and 1897 at a cost of AU$1.8 million. The reservoir supplies over a half a million people, from Adelaide's southern extent to the city-centre itself.
   Initially 15 kilometres from Adelaide, the reservoir is now largely enveloped by the city's southern suburbs, of which the relocated Happy Valley village is one. The Happy Valley Reservoir is relatively small in capacity; holding only 11,500 megalitres, it's dwarfed by Mount Bold Reservoir which is at least four times larger.
   Water from the dam was originally supplied to Adelaide through a tunnel under Black Road. In the early 1960s, the original intake tunnel from the Clarendon Weir was increased in size to allow access by maintenance vehicles, and a second outlet tunnel was constructed under South Road. In the late 1980s, this new tunnel became the outlet for the water filtration plant, and the original outlet was abandoned..
   Between 2002 and 2004, the Reservoir underwent a major renovation as part of AU$22 million rehabilitation project aimed at enhancing the Reservoir to meet guidelines of best practice for dam management at both international and national levels.
   With the lowering of the water level during renovations exposing the original Happy Valley township for the first time, archaeologists took the opportunity to excavate the site. Despite the township being entirely intact and undamaged when flooded in 1896, very little was found apart from scattered bricks and the foundations of several buildings.

Capacity: 11,500 megalitres
Length of wall: 1,155 m
Height of wall: 23.6 m
Type of wall: Earth with clay core
Area of water spread: 1.88 km²

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