View over Glenbawn Lake, looking south towards Glenbawn Dam embankment wall, 2013
|Location||Hunter region, New South Wales|
|Purpose||Environmental, hydro-electric power, irrigation, water supply and conservation|
|Owner(s)||State Water Corporation|
|Dam and spillways|
|Type of dam||Embankment dam|
|Height||100 m (330 ft)|
|Length||1,125 m (3,691 ft)|
|Spillway type||Concrete chute spillway plus fuse plugs|
|Spillway capacity||11,115 m3/s (392,500 cu ft/s)|
|Total capacity||749,840 ML (26,480×106 cu ft)|
|Catchment area||1,300 km2 (500 sq mi)|
|Surface area||2,614 ha (6,460 acres)|
|Maximum water depth||85 m (279 ft)|
|Normal elevation||276 m (906 ft) AHD|
|Commission date||January 1995|
|Installed capacity||5.5 MW (7,400 hp)|
|Annual generation||4.4 GWh (16 TJ)|
Glenbawn Dam is a major ungated earth and rock fill with clay core embankment dam with concrete chute spillway plus fuse plugs across the Hunter River upstream of Aberdeen in the Hunter region of New South Wales, Australia. The dam's purpose includes flood mitigation, hydro-electric power, irrigation, water supply and conservation. The impounded reservoir is called Lake Glenbawn.
Glenbawn Dam was created through enabling legislation enacted through the passage of the Glenbawn Dam Act, 1946 (NSW). The Act appropriated A£1,500,000 as the estimated cost of construction of the dam.
Location and features
Commenced in late 1947 and completed in late 1957, the Glenbawn Dam is a major dam on the Hunter River and is the fourth largest earth-filled embankment dam in Australia by volume. The dam is located approximately 14 kilometres (8.7 mi) east of the town of Scone on the upper reaches of the river. The dam was built by the New South Wales Water Conservation & Irrigation Commission to supply water for irrigation and flood mitigation.
The dam wall height is 100 metres (330 ft) and is 1,125 metres (3,691 ft) long. The maximum water depth is 85 metres (279 ft) and at 100% capacity the dam wall holds back 749,840 megalitres (26,480×106 cu ft) of water at 276 metres (906 ft) AHD. The dam has an additional reserve capacity of 120,000 megalitres (4,200×106 cu ft) to hold floodwaters that reduce flooding downstream. The surface area of Lake Glenbawn is 2,614 hectares (6,460 acres) and the catchment area is 1,300 square kilometres (500 sq mi). The ungated concrete chute spillway is capable of discharging 11,115 cubic metres per second (392,500 cu ft/s). An upgrade of facilities completed in 1987 took the height of the dam wall from 78 metres (256 ft) to its current height. Glenbawn Dam is operated in conjunction with Glennies Creek Dam. The two dams supply water requirements along 40 kilometres (25 mi) of the Hunter River from Glenbawn to the tidal reaches near Maitland.
The name Glenbawn originates after a riverside property resumed for part of the storage area.
A hydro-electric power station generates up to 5.5 megawatts (7,400 hp) of electricity from the flow of the water leaving Glenbawn Dam with an average output of 4.4 gigawatt-hours (16 TJ) per annum. The station was completed in January 1995. The facility is managed by AGL Energy.
- "Glenbawn Dam Act" (PDF). AustLII database. Australasian Legal Information Institute. 1946. Retrieved 15 April 2013.
- "Glenbawn Dam" (PDF). State Water Corporation. 2009. Archived from the original (PDF brochure) on 20 March 2012. Retrieved 16 April 2013.
- "Register of Large Dams in Australia" (Excel (requires download)). Dams information. The Australian National Committee on Large Dams Incorporated. 2010. Retrieved 16 April 2013.
- "Glenbawn Dam". Water delivery: dams. State Water Corporation. Archived from the original on 10 April 2013. Retrieved 15 April 2013.
- "Glenbawn Dam". Geographical Names Register (GNR) of NSW. Geographical Names Board of New South Wales. Retrieved 15 April 2013.
- "Glenbawn Power Station, New South Wales". Power generation portfolio: Hydro-electric. AGL Energy Limited. Archived from the original on 9 April 2013. Retrieved 16 April 2013.
- "State Parks: Lake Glenbawn". Trade & Investment: Crown Lands. Government of New South Wales. 2010. Retrieved 15 April 2013.