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Scrivener Dam
Scrivener Dam is a concrete gravity dam that impounds the Molonglo River in Canberra, Australian Capital Territory. The dam creates Lake Burley Griffin, which was established for recreational and ornamental purposes. Named in honour of surveyor Charles Scrivener, the dam was officially inaugurated on 20 September 1963 and the official filling of the lake commemorated on 17 October 1964 by the Prime Minister, Robert Menzies.
The dam wall is located on Lady Denman Drive and is adjacent to the National Zoo & Aquarium and a viewing area for the official residence of the Governor-General of Australia.
Scrivener Dam, designed in Germany, holds back the waters of the Molonglo River within Lake Burley Griffin. About 55,000 cubic metres (1,900,000 cu ft) of concrete was used in the construction of the dam wall. The dam is 33 metres (108 ft) high and 319 metres (1,047 ft) long with a maximum wall thickness of 19.7 metres (65 ft). The dam is designed to handle a once in 5,000 year flood event.
It utilised state-of-the-art post-tensioning techniques to cope with any problems or movements in the riverbed.
The dam has five bay spillways controlled by 30.5 metres (100 ft) wide, hydraulically operated fish-belly flap gates. Hinge anchors support the flap gates; with six hinges per gate, and four anchors per hinge. The fish-belly gates allow for a precise control of water level, reducing the dead area on the banks between high and low water levels. As at November 2010, the five gates have only been opened simultaneously once in the dam's history, during heavy flooding in 1976.
The dam wall provides a crossing for the lake and consists of a roadway, called Lady Denman Drive, and a bicycle path. The roadway was possible because the dam gates are closed by pushing up from below, unlike most previous designs that wherein the gates were lifted from above.
The National Capital Authority, a statutory authority of the Australian Government, is responsible for the administration and oversight of Scrivener Dam, as the dam lies within the Designated Area, under the Australian Capital Territory (Planning and Land Management) Act, 1988 (Cth). The Authority manages external contractors to deliver services that are competitively tendered.
A routine annual audit of the dam wall undertaken during 2011 revealed that the anchor bolts, which are part of the flap gate hinge mechanism, showed signs of corrosion. These bolts, of which there are 120 in total, are each 50 millimetres (2.0 in) in diameter and 2 metres (6 ft 7 in) long. It was anticipated that work would be completed by the end of 2013, and cost A$20m.
Scrivener Dam
Scrivener Dam is a concrete gravity dam that impounds the Molonglo River in Canberra, Australian Capital Territory. The dam creates Lake Burley Griffin, which was established for recreational and ornamental purposes. Named in honour of surveyor Charles Scrivener, the dam was officially inaugurated on 20 September 1963 and the official filling of the lake commemorated on 17 October 1964 by the Prime Minister, Robert Menzies.
The dam wall is located on Lady Denman Drive and is adjacent to the National Zoo & Aquarium and a viewing area for the official residence of the Governor-General of Australia.
Scrivener Dam, designed in Germany, holds back the waters of the Molonglo River within Lake Burley Griffin. About 55,000 cubic metres (1,900,000 cu ft) of concrete was used in the construction of the dam wall. The dam is 33 metres (108 ft) high and 319 metres (1,047 ft) long with a maximum wall thickness of 19.7 metres (65 ft). The dam is designed to handle a once in 5,000 year flood event.
It utilised state-of-the-art post-tensioning techniques to cope with any problems or movements in the riverbed.
The dam has five bay spillways controlled by 30.5 metres (100 ft) wide, hydraulically operated fish-belly flap gates. Hinge anchors support the flap gates; with six hinges per gate, and four anchors per hinge. The fish-belly gates allow for a precise control of water level, reducing the dead area on the banks between high and low water levels. As at November 2010, the five gates have only been opened simultaneously once in the dam's history, during heavy flooding in 1976.
The dam wall provides a crossing for the lake and consists of a roadway, called Lady Denman Drive, and a bicycle path. The roadway was possible because the dam gates are closed by pushing up from below, unlike most previous designs that wherein the gates were lifted from above.
The National Capital Authority, a statutory authority of the Australian Government, is responsible for the administration and oversight of Scrivener Dam, as the dam lies within the Designated Area, under the Australian Capital Territory (Planning and Land Management) Act, 1988 (Cth). The Authority manages external contractors to deliver services that are competitively tendered.
A routine annual audit of the dam wall undertaken during 2011 revealed that the anchor bolts, which are part of the flap gate hinge mechanism, showed signs of corrosion. These bolts, of which there are 120 in total, are each 50 millimetres (2.0 in) in diameter and 2 metres (6 ft 7 in) long. It was anticipated that work would be completed by the end of 2013, and cost A$20m.
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