The dam wall comprising 141,000 cubic metres (5,000,000 cu ft) of concrete is 86 metres (282 ft) high and 218 metres (715 ft) long. At 100% capacity the dam wall holds back 52,793 megalitres (1,864.4×10^6 cu ft) of water. The surface area of Tumut Pond Reservoir is 202.7 hectares (501 acres) and the catchment area is 332 square kilometres (128 sq mi). The gated spillway is capable of discharging 1,926 cubic metres per second (68,000 cu ft/s)[2][3] through two 14.3 m (47 ft) wide by 9.1 m (30 ft) high radial gates.
The crest of the dam wall forms part of the road between Cabramurra and Khancoban. The road is closed to through traffic in winter as it is not routinely cleared of snow and ice.
Downstream of the dam wall and located underground is Tumut 1, a conventional hydroelectric power station, that has four turbinegenerators, with a generating capacity of 330 megawatts (440,000 hp) of electricity; and a net generation of 847 gigawatt-hours (3,050 TJ) per annum. The power station has 262.1 metres (860 ft) rated hydraulic head. The underground powerhouse is located 366 metres (1,201 ft) below ground level.[4]
Tumut Pond Reservoir
Tumut Pond Reservoir or Tumut Pond Pondage (sometimes also Tumut 1 Reservoir/Tumut 1 Pondage) is formed by the Tumut Pond Dam. Snowmelt and other runoff enter the reservoir from the upper Tumut River and the dam impounds the river's natural flow below the Tumut Two Dam wall.
^ ab"Register of Large Dams in Australia". Dams information. The Australian National Committee on Large Dams Incorporated. 2010. Archived from the original(Excel (requires download)) on 12 December 2013. Retrieved 6 May 2013.