Tumut Two Dam
|Tumut Two Dam|
New South Wales
|Location||Snowy Mountains, New South Wales|
|Purpose||Hydro-power, diversion, irrigation|
|Dam and spillways|
|Type of dam||Gravity dam|
|Height||46 m (151 ft)|
|Length||119 m (390 ft)|
|Dam volume||48 m3 (1,700 cu ft)|
|Spillway capacity||2,152 m3/s (76,000 cu ft/s)|
|Creates||Tumut Two Reservoir|
|Total capacity||2,677 ML (94.5×106 cu ft)|
|Catchment area||396 km2 (153 sq mi)|
|Surface area||182 ha (450 acres)|
|Hydraulic head||292.6 m (960 ft)|
|Installed capacity||286 MW (384,000 hp)|
|Annual generation||787 GWh (2,830 TJ)|
Tumut Two Dam or Tumut Two // is a major ungated concrete gravity dam across the upper reaches of the Tumut River in the Snowy Mountains of New South Wales, Australia. The dam's main purpose is for the generation of hydro-power and is one of the sixteen major dams that comprise the Snowy Mountains Scheme, a vast hydroelectricity and irrigation complex constructed in south-east Australia between 1949 and 1974 and now run by Snowy Hydro.
The impounded reservoir is called the Tumut Two Reservoir, or less formally, the Tumut Two Pondage.
Location and features
Completed in 1961, Tumut Two Dam is a major dam, located approximately 3 kilometres (1.9 mi) west of Cabramurra. The dam was constructed by a consortia comprising Kaiser-Walsh-Perini-Raymond based on engineering plans developed by the Snowy Mountains Hydroelectric Authority and the United States Bureau of Reclamation under contract from the Snowy Mountains Hydroelectric Authority.
The dam wall comprising 48 cubic metres (1,700 cu ft) of concrete is 46 metres (151 ft) high and 119 metres (390 ft) long. At 100% capacity the dam wall holds back 2,677 megalitres (94.5×106 cu ft) of water. The surface area of Tumut Two Reservoir is 182 hectares (450 acres) and the catchment area is 396 square kilometres (153 sq mi). The spillway is capable of discharging 2,152 cubic metres per second (76,000 cu ft/s).
Downstream of the dam wall and located underground is Tumut 2, a conventional hydroelectric power station, that has four turbine generators, with a generating capacity of 286 megawatts (384,000 hp) of electricity; and a net generation of 787 gigawatt-hours (2,830 TJ) per annum. The power station has 262.1 metres (860 ft) rated hydraulic head. The underground powerhouse is located 244 metres (801 ft) below ground level.
Tumut Two Reservoir
Tumut Two Reservoir or Tumut Two Pondage (sometimes also Tumut 2 Reservoir/Tumut 2 Pondage) is formed by the Tumut Two Dam. Snowmelt and other runoff enter the reservoir from the upper Tumut River and the dam impounds the river's natural flow above the Tumut Pond Dam wall and the Tumut Pond Reservoir.
Water from the reservoir, after passing over the spillway of the Tumut Pond Dam, flows downstream, above the underground Tumut 1 Power Station, and into the impounded waters of Talbingo Reservoir, formed by the Talbingo Dam; past Tumut 3 Power Station, into Jounama Pondage, formed by Jounama Dam; and then into Blowering Reservoir, formed by Blowering Dam, passing through Blowering Power Stations. The natural flow of the Tumut River continues into the Riverina region.
- List of dams and reservoirs in New South Wales
- Snowy Hydro Limited
- Snowy Mountains Scheme
- Tumut Hydroelectric Power Station
- Macquarie Dictionary, Fourth Edition. Melbourne: The Macquarie Library Pty Ltd. 2005. ISBN 1-876429-14-3.
- "Register of Large Dams in Australia" (Excel (requires download)). Dams information. The Australian National Committee on Large Dams Incorporated. 2010. Retrieved 8 May 2013.
- "Dams". Snowy Mountains Scheme. Snowy Hydro. Retrieved 22 April 2012.
- "Tumut-2 Hydroelectric Power Station Australia". Global Energy Observatory. 11 May 2012. Retrieved 8 May 2013.
- Bevitt, R.; Erskine, W.; Gillespie, G.; Harriss, J.; Lake, P.; Miners, B.; Varley, I. (May 2009). "Expert panel environmental flow assessment of various rivers affected by the Snowy Mountains Scheme" (PDF). NSW Department of Water and Energy. ISBN 978-0-7347-5656-5.