A view of the impounded Lake Eildon, in 2011
|Location||Victorian Alps, Victoria|
|Dam and spillways|
|Type of dam||Embankment dam|
|Height||84.5 m (277 ft)|
|Length||1,085 m (3,560 ft)|
|Dam volume||10,200×103 m3 (360×106 cu ft)|
|Spillway capacity||3,356 m3/s (118,500 cu ft/s)|
|Total capacity||3,390,000 ML (750,000×106 imp gal; 900,000×106 US gal)|
|Catchment area||3,885 km2 (1,500 sq mi)|
|Surface area||13,832 ha (34,180 acres)|
|Max. water depth||79 m (259 ft)|
|Normal elevation||288.9 m (948 ft) AHD|
|Name||Eildon Hydroelectric Power Station|
|Installed capacity||135 MW (181,000 hp)|
|Annual generation||226 GWh (810 TJ)|
The Eildon Dam or Eildon Weir, a rock and earth-fill embankment dam with a controlled spillway across the Goulburn River, is located between the regional towns of and within Lake Eildon National Park, in the Alpine region of Victoria, Australia. The dam's purpose is for the supply of potable water, irrigation, and the generation of hydroelectricity. The impounded reservoir is called Lake Eildon.
Location and features
Designed by the State Rivers and Water Supply Commission of Victoria, construction of the original water storage, which was known as Sugarloaf Reservoir, took place between 1915 and 1929 to provide irrigation water for what was a vast uncultivated area on Victoria's northern plains. The dam was modified in 1929, and again in 1935 to increase the storage capacity to 377,000 megalitres (83×109 imp gal; 100×109 US gal). However, this reservoir was still limited in its capacity to meet the growing demand for water in the Goulburn Valley and to protect farmers during drought years. Following a detailed feasibility study of all possible storage sites on the Goulburn River, it was decided that the existing dam site was the most suitable for construction of a larger dam. In 1951, work began to enlarge the storage to its present capacity. The enlargement was completed in 1955 and the storage was renamed Lake Eildon.
The embankment dam wall is constructed with an earth core and rock fill, rising to a height of 83 metres (272 ft). The core component materials of the wall include 10,200 thousand cubic metres (360×106 cu ft) of rock and earth. With a catchment area of 3,885 square kilometres (1,500 sq mi) that includes the Goulburn, Delatite, Howqua, Big, and Jamieson rivers and several minor tributaries, the reservoir covers an area of 13,832 hectares (34,180 acres). The reservoir has a capacity of 3,390,000 megalitres (746×109 imp gal; 896×109 US gal) with an average depth of 24 metres (79 ft), and can release a maximum outflow of approximately 3,356 cubic metres per second (118,500 cu ft/s) via its controlled spillway. The crest of the uncontrolled spillway is 288.9 metres (948 ft) AHD and is approximately 1,085 metres (3,560 ft) long.
Lake Eildon is connected to the metropolitan water supply of Melbourne, the state capital, via a pipeline from the Goulburn River. On average, 91% of the water from Lake Eildon goes to the Goulburn Weir and the Waranga Basin before it flows to irrigators in the Goulburn Valley system.
Operated by AGL Energy, a hydro–electric power station operates during the irrigation season from August to May is governed mainly by release of water to meet irrigation demands, but it may also be operated during winter and spring when flood releases can be used to generate electricity. The power station can also be used to meet short term emergency power needs resulting from industrial disputes or plant breakdown elsewhere in the State's power grid. Initially completed as part of the Sugarloaf Reservoir with just 15 megawatts (20,000 hp) of hydro–electric generating power, capacity was increased in 1956 to 120 megawatts (160,000 hp) through the installation of two 60 megawatts (80,000 hp) turbines. The oldest turbines were renovated in 2001 to provide a generation capacity of 135 megawatts (181,000 hp). A 5,200 megalitres (1.1×109 imp gal; 1.4×109 US gal) pondage below the dam temporarily detains water discharged from the power station and regulates releases downstream to minimise variations in flow due to intermittent power generation. In 1995 a small hydro-electric station with 4.5 megawatts (6,000 hp) output was installed on the pondage.
Drought and recovery
During the drought years in Victoria in the 2000s, Lake Eildon rarely filled and the once-thriving holiday destinations around the lake were unable to attract visitors, leading to considerable economic hardship. Although water is in great demand for agriculture, careful regulation has kept outflows fairly static. During November 2006 the lake dropped to a low of only 15% from the previous year level of 48.3%.
After many years with below average rainfall, 2010 saw Lake Eildon receive above average rainfall and rose from 23% of capacity in May 2010 to be 82.5% as of March 2011.
During construction of a new embankment, 1954
- "Lake Eildon". Vicnames. Government of Victoria. 2 May 1966. Retrieved 16 July 2014.
- "Eildon Lake fishing: fishing maps and fishing info for Eildon Lake", Fishing Victoria, retrieved 31 May 2011
- "Lake Eildon". Goulburn–Murray Water. Retrieved 16 July 2014.
- "Register of Large Dams in Australia" (Excel (requires download)). Dams information. Australian National Committee on Large Dams. 2010. Retrieved 16 July 2014.
- "Map of Lake Eildon, VIC". Bonzle Digital Atlas of Australia. Retrieved 16 July 2014.