Edgar Dam | |
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Location of the Edgar Dam in Tasmania | |
Country | Australia |
Location | South West Tasmania |
Coordinates | 43°01′48″S146°20′24″E / 43.03000°S 146.34000°E |
Purpose | Power |
Status | Operational |
Opening date | 1973 |
Owner(s) | Hydro Tasmania |
Dam and spillways | |
Type of dam | Embankment dam |
Impounds | Off stream |
Height | 17 metres (56 ft) |
Length | 460 metres (1,510 ft) |
Dam volume | 96×10 3 m3 (3.4×10 6 cu ft) |
Spillways | 0 |
Reservoir | |
Creates | Lake Pedder |
Total capacity | 2,937,930 ML (103,752×10 6 cu ft) |
Catchment area | 734 km2 (283 sq mi) |
Surface area | 241 km2 (93 sq mi) |
Maximum water depth | 43 m (141 ft) |
Website hydro |
The Edgar Dam is an earthfill embankment saddle dam without a spillway, located offstream in the South West region of Tasmania, Australia.
The impounded reservoir, also formed with the Scotts Peak Dam and the Serpentine Dam, is called Lake Pedder which flooded Lake Edgar, a naturally forming fault scarp pond. The dam was constructed in 1973 by the Hydro Electric Corporation (TAS) as part of the Gordon River Power Development Scheme for the purpose of generating hydro-electric power via the Gordon Power Station. Water from Lake Pedder is diverted to Lake Gordon (formed by the Gordon Dam) via the McPartlan Pass Canal. [1]
The Edgar Dam, together with the Scotts Peak Dam and the Serpentine Dam, are three major dams that form the headwaters for the Gordon River Power Development Scheme. The dam is located near Lake Pedder's most easterly point [2] in the upper reaches of the Huon River where the river descends from the Marsden Range and descends into what is now known as the Huon Basin. Also at the southern end of the Lake Pedder, the Scotts Peak Dam impounds the Huon River. At the northwestern end of the lake is impounded by the Serpentine Dam across the Serpentine River. The water in Lake Pedder provides around 40% of the water used in the Gordon Power Station. The water flows to Lake Gordon via McPartlan Canal. [1] Water from Lake Gordon then exits through the Gordon Dam.
The Edgar Dam wall, constructed with 96 thousand cubic metres (3.4×10 6 cu ft) of earth core, is 17 metres (56 ft) high and 460 metres (1,510 ft) long. At 100% capacity the dam wall holds back 2,937,930 megalitres (103,752×10 6 cu ft) of water. The surface area of Lake Pedder is 241,330 hectares (596,300 acres) and the catchment area is 734 square kilometres (283 sq mi). The dam wall does not have a spillway. [3]
The dam draws its name from the flooded Lake Edgar.
The Lake Edgar Fault is a 30-kilometre (19 mi) long north–south trending scarp that occurs within the boundary of the Southwest National Park. The scarp traverses the button grass of the Huon Plains and is notable because faulting resulted in the defeat of westerly flowing drainage and the consequent formation of the fault-bound sag pond of Lake Edgar. [4] In January 2001 a tremor measuring 3.2 on the Richter magnitude scale occurred near the Lake Edgar fault, which runs adjacent to the Edgar Dam, however damage was negligible. [5] [6] [7] [8] [9]
In 2002 it was reported that a dam safety manager from Hydro Tasmania, was confident that the eventuality of the Edgar dam being destroyed by an earthquake was an extremely remote possibility, with a University of Tasmania Geophysicist agreeing that the risk of collapse was remote. [10]
Lake Pedder, once a glacial outwash lake, is a man-made impoundment and diversion lake located in the southwest of Tasmania, Australia. In addition to its natural catchment from the Frankland Range, the lake is formed by the 1972 damming of the Serpentine and Huon rivers by the Hydro Electric Commission of Tasmania for the purposes of hydroelectric power generation.
Lake Gordon is a man-made reservoir created by the Gordon Dam, located on the upper reaches of the Gordon River in the south-west region of Tasmania, Australia.
The Gordon River is a major perennial river located in the central highlands, south-west, and western regions of Tasmania, Australia.
Hydro Tasmania, known for most of its history as the Hydro-Electric Commission (HEC) or The Hydro, is the trading name of the Hydro-Electric Corporation, a Tasmanian Government business enterprise which is the predominant electricity generator in the state of Tasmania, Australia. The Hydro was originally oriented towards hydro-electricity, due to Tasmania's dramatic topography and relatively high rainfall in the central and western parts of the state. Today Hydro Tasmania operates thirty hydro-electric and one gas power station, and is a joint owner in three wind farms.
The Great Lake, officially yingina / Great Lake, is a natural lake and man-made reservoir that is located in the central northern region of Tasmania, Australia.
Lake Margaret is a concrete-faced gravity dam with an uncontrolled spillway across the Yolande River, located on the north side of Mount Sedgwick, in the West Coast Range, West Coast of Tasmania, Australia.
The Huon River is a perennial river located in the south-west and south-east regions of Tasmania, Australia. At 174 kilometres (108 mi) in length, the Huon River is the fifth-longest in the state, with its course flowing east through the fertile Huon Valley and emptying into the D'Entrecasteaux Channel, before flowing into the Tasman Sea.
The Crotty Dam, also known during construction as the King Dam, or the King River Dam on initial approval, is a rockfill embankment dam with a controlled and uncontrolled spillway across the King River, between Mount Jukes and Mount Huxley, located in Western Tasmania, Australia.
The Darwin Dam is an offstream earthfill embankment saddle dam without a spillway, located in Western Tasmania, Australia. The impounded reservoir, also formed by Crotty Dam, is called Lake Burbury.
The Gordon Power Station is the largest conventional hydroelectric power station in Tasmania, Australia; located in the South West region of the state. The power station is situated on Gordon River. Water from Lake Gordon descends 183 metres (600 ft) underground past the Gordon Dam and into the power station.
The Borumba Dam is a rock-fill embankment dam with an un-gated spillway located across the Yabba Creek, a tributary of the Mary River, in the Wide Bay–Burnett region of Queensland, Australia. The main purposes of the dam are for irrigation and potable water supply. The resultant impounded reservoir is called Lake Borumba.
The Gordon River Road, sometimes called the Strathgordon Road, (B61), is a road in the south western region of Tasmania, Australia.
The Gordon Dam, also known as the Gordon River Dam, is a major gated double curvature concrete arch dam with a controlled spillway across the Gordon River, located in Southwest National Park, Tasmania, Australia. The impounded reservoir is called Lake Gordon.
The Serpentine River is a major perennial river located in the south-west and western regions of Tasmania, Australia.
The Scotts Peak Dam Road is the most southerly point of road access into Southwest National Park, Tasmania, Australia.
The Scotts Peak Dam is a rockfill embankment dam without a spillway across the Huon River, located in the South West region of Tasmania, Australia.
The Serpentine Dam is a rockfill embankment dam with a concrete face and a controlled spillway across the Serpentine River, located in the South West region of Tasmania, Australia.
The Anthony Power Development Scheme, part of the Pieman River power development scheme, was a proposed scheme for damming parts of the upper catchment of the Pieman River in Western Tasmania, Australia.
Lake Edgar was a natural fault scarp pond on the upper reaches of the Huon River in South West Tasmania.
The Meander Dam is a concrete gravity dam across the Upper Meander River, located in northern Tasmania, Australia. The impounded reservoir is called Lake Huntsman.