Glenbawn Dam
| Glenbawn Dam | |
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View over Glenbawn Lake, looking south towards Glenbawn Dam embankment wall, 2013
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 Location of the Glenbawn Dam in
New South Wales |
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| Country | Australia |
| Location | Hunter region, New South Wales |
| Coordinates | 32°5′54″S 150°59′4″E / 32.09833°S 150.98444°ECoordinates: 32°5′54″S 150°59′4″E / 32.09833°S 150.98444°E |
| Purpose | Environmental, hydro-electric power, irrigation, water supply and conservation |
| Status | Operational |
| Construction began | 1948 |
| Opening date | 1958 |
| Construction cost | A£1,500,000 |
| Owner(s) | State Water Corporation |
| Dam and spillways | |
| Type of dam | Embankment dam |
| Impounds | Hunter River |
| Height | 100 m (330 ft) |
| Length | 1,125 m (3,691 ft) |
| Spillways | 2 |
| Spillway type | Concrete chute spillway plus fuse plugs |
| Spillway capacity | 11,115 m3/s (392,500 cu ft/s) |
| Reservoir | |
| Creates | Lake Glenbawn |
| 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 |
| Power station | |
| Operator(s) | AGL Energy |
| Commission date | January 1995 |
| Type | Conventional |
| Turbines | 1 |
| Installed capacity | 5.5 MW (7,400 hp) |
| Annual generation | 4.4 GWh (16 TJ) |
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Website Glenbawn Dam at www.statewater.com.au |
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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.
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.
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