Edgar Dam
| Edgar Dam | |
|---|---|
 Location of the Edgar Dam in Tasmania
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| Country | Australia |
| Location | South West Tasmania |
| Coordinates | 43°01′48″S 146°20′24″E / 43.03000°S 146.34000°ECoordinates: 43°01′48″S 146°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 | 96×103 m3 (3.4×106 cu ft) |
| Spillways | 0 |
| Reservoir | |
| Creates | Lake Pedder |
| Total capacity | 2,937,930 ML (103,752×106 cu ft) |
| Catchment area | 734 km2 (283 sq mi) |
| Surface area | 241 km2 (93 sq mi) |
| Maximum water depth | 43 m (141 ft) |
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Website hydro |
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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.
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 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. Water from Lake Gordon then exits through the Gordon Dam.
The Edgar Dam wall, constructed with 96 thousand cubic metres (3.4×106 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 (103,752×106 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.
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