Glenmaggie Dam

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Glenmaggie Dam
Glenmaggie Dam 16062017.jpg
Downstream face.
Glenmaggie Dam is located in Victoria
Glenmaggie Dam
Location of the Glenmaggie Dam in Victoria
Country Australia
Location Sale, Central Gippsland, Victoria
Coordinates 37°54′17″S 146°48′00″E / 37.90472°S 146.80000°E / -37.90472; 146.80000Coordinates: 37°54′17″S 146°48′00″E / 37.90472°S 146.80000°E / -37.90472; 146.80000
Purpose Irrigation
Status Operational
Construction began 1919
Opening date 1927
Owner(s) Southern Rural Water
Dam and spillways
Type of dam Gravity dam
Impounds Macalister River
Height 37 m (121 ft)
Length 295 m (968 ft)
Elevation at crest 77 m (253 ft) AHD
Width (crest) 99 m (325 ft)
Dam volume 77×10^3 m3 (2.7×10^6 cu ft)
Spillways 2
Spillway type Uncontrolled
Spillway capacity 3,400 m3/s (120,000 cu ft/s)
Reservoir
Creates Lake Glenmaggie
Total capacity 190,410,000 m3 (6.724×109 cu ft)
Active capacity 177,628,000 m3 (6.2729×109 cu ft)
Inactive capacity 4,860,000 m3 (172,000,000 cu ft)
Catchment area 1,891 km2 (730 sq mi)
Surface area 1,760 ha (4,300 acres)
Glenmaggie Power Station
Commission date 1994
Turbines 2 x Francis-type
Installed capacity 4 MW (5,400 hp)
Annual generation 9 GWh (32 TJ)
Website
Glenmaggie Dam at Southern Rural Water

The Glenmaggie Dam is a concrete rock foundation gravity dam with two uncontrolled spillways across the Macalister River, located near Sale, Central Gippsland, in the Australian state of Victoria. The dam's purpose includes irrigation, the generation of hydro-electric power, water supply and conservation. The impounded reservoir is called Lake Glenmaggie.

Location and features[edit]

Construction of the Glenmaggie Dam commenced in 1919, was completed in 1927 and constructed by the State Rivers and Water Supply Commission of Victoria. When full following its construction, the dam held 132,000 megalitres (4,700×10^6 cu ft)[1] and provided irrigation to approximately 360 square kilometres (140 sq mi) of farming land in the Central Gippsland region; via a gravity irrigation systems to properties in the Macalister Irrigation District, near the towns of Maffra, Heyfield, Stratford and Sale. The Macalister Irrigation District covers about 53,000 hectares (130,000 acres) around the Macalister and Thomson rivers, extending from Lake Glenmaggie to Sale. It comprises two areas: the Maffra-Sale Irrigation Area to the north of the Thomson River and the Central Gippsland Area (including the Nambrok-Denison Soldier Settlement district) to the south.[2]

The Glenmaggie Dam wall, which creates the Glenmaggie Lake, is a mass concrete overfall dam with irrigation outlets on both sides of the river serving irrigation channels. The central portion is an overfall spillway.[2] The dam wall was raised in 1958 by the addition of gates; stabilised using ground anchors in 1989;[3] and upgraded in 2003 to enable it to withstand overtopping.[2]

In 1994, a hydro-electric power station with two Francis turbine-generators was commissioned, with a capacity of 4 megawatts (5,400 hp) and generating 9 gigawatt-hours (32 TJ) per annum.[3][4]

Flooding[edit]

In June 2007, the Macalister catchment experienced record flooding. Inflows into Lake Glenmaggie peaked in excess of 250,000 megalitres (5.5×1010 imp gal; 6.6×1010 US gal) per day and releases peaked at 147,000 megalitres (3.2×1010 imp gal; 3.9×1010 US gal) per day. A second flood occurred in November 2007 with inflows into Lake Glenmaggie peaking at 70,000 megalitres (1.5×1010 imp gal; 1.8×1010 US gal) per day and releases peaking at 59,000 megalitres (1.3×1010 imp gal; 1.6×1010 US gal) per day. Repairs totaling around A$4 million were completed after the June and November 2007 floods.[1]

See also[edit]

References[edit]

  1. ^ a b "Lake Glenmaggie: History". Water resources: Water storages. Southern Rural Water. 2014. Retrieved 4 March 2014. 
  2. ^ a b c "Lake Glenmaggie". Water resources: Water storages. Southern Rural Water. 2014. Retrieved 4 March 2014. 
  3. ^ a b "Register of Large Dams in Australia" (Excel (requires download)). Dams information. The Australian National Committee on Large Dams Incorporated. 2010. Retrieved 4 March 2014. 
  4. ^ Dilawar, Singh (September 1999). "Renewable Energy Technologies in Australia and New Zealand" (PDF). United Nations Educational, Scientific and Cultural Organization. p. 24. Retrieved 5 March 2014.