O'Shannassy Reservoir

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O'Shannassy Reservoir - Wikipedia

Coordinates: 37°40′30″S 145°48′20″E / 37.67500°S 145.80556°E

From Wikipedia, the free encyclopedia

O'Shannassy Dam
Location of the O'Shannassy Reservoir in Victoria
Country	Australia
Location	McMahons Creek, Victoria
Coordinates	37°40′30″S 145°48′20″E / 37.67500°S 145.80556°E / -37.67500; 145.80556
Purpose	Water supply
Status	Operational
Construction began	1922^[1]
Opening date	1928
Operator(s)	Melbourne Water
Dam and spillways
Type of dam	Embankment with an internal reinforced concrete wall
Impounds	O'Shannassy River
Height	34 m (112 ft)
Length	226 m (741 ft)
Dam volume	245,000 m³ (8.7 million cu ft)
Spillways	1
Spillway type	Uncontrolled
Spillway capacity	500 cubic metres per second (18,000 cu ft/s)
Reservoir
Creates	O'Shannassy Reservoir
Total capacity	3.123 GL (687 million imp gal; 825 million US gal)
Catchment area	11.9 ha (29 acres)
Surface area	27 ha (67 acres)
^[2]

The O'Shannassy Reservoir is an Australian man-made water supply dammed reservoir. The 3.123 GL (687 million imp gal; 825 million US gal) water store across the O'Shannassy River is located near the locality of McMahons Creek, approximately 80 kilometres (50 mi) east of Melbourne, Victoria. The dam that creates the impoundment is called the O'Shannassy Dam.^[3]^[4]

Location and features

The reservoir is part of Melbourne's water supply system. Water flows under gravity to Silvan Reservoir, then to storage and distribution reservoirs around Melbourne. It is the smallest of the water storage reservoirs managed by Melbourne Water, with a capacity of approximately 3.123 GL (687 million imp gal; 825 million US gal), but it is on a very productive catchment, with stream flow averaging 80 GL (18 billion imp gal; 21 billion US gal) per annum.^[5]^[6]^[7]^[8]

The location was selected as it is at sufficient altitude for gravity supply to the elevated eastern suburbs of Melbourne. A diversion weir on the O'Shannassy River and aqueduct to the Surrey Hills Reservoir in Melbourne were completed in 1914. The weir was complemented by the construction of the dam and its reservoir in 1928, but the weir was still used to divert river flows into the aqueduct. The construction of the Yarra-Silvan conduits in the 1950s resulted in reduced requirements for the aqueduct which was decommissioned in 1997.^[7]^[8]

References

^ "ENORMOUS DAMS BEING BUILT". The Ballarat Star. No. 20235. Victoria, Australia. 28 June 1922. p. 10. Retrieved 7 March 2017 – via National Library of Australia.
^ "Register of Large Dams in Australia". Dams information. Australian National Committee on Large Dams. 2010. Archived from the original (Excel (requires download)) on 12 December 2013. Retrieved 22 March 2014.
^ "METROPOLITAN WATER SUPPLY. : Successful and Comprehensive Scheme. How Engineers Overcame Difficulties. Details and Illustrations. No. 5. 0'Shannassy and Upper Yarra system". The Prahran Telegraph. Vol. 67, no. 3416. Victoria, Australia. 4 February 1927. p. 3. Retrieved 7 March 2017 – via National Library of Australia.
^ "A VISIT TO THE WATERSHEDS: NORTHCOTE COUNCIL INSPECT THE O'SHANNASSY SCHEME". The Advertiser. Vol. 68. Victoria, Australia. 25 October 1929. p. 3 (AFTERNOON). Retrieved 7 March 2017 – via National Library of Australia.
^ O'Shannassy Reservoir, Melbourne Water, retrieved 26 May 2019
^ Balassone, Paul (2006), Pigging of the O'Shannassy Outlet Mains (PDF), 69th Annual Victorian Water Industry Engineers and Operators Conference, retrieved 8 September 2010
^ ^a ^b O'Shannassy Aqueduct Trail, Yarra Ranges National Park (PDF), Parks Victoria, June 2013, retrieved 26 May 2019
^ ^a ^b Ritchie, E. G. (October 1934), "Melbourne's Water Supply Undertaking" (PDF), Journal of Institution of Engineers Australia, 6: 379–382, archived from the original (PDF) on 18 February 2011

v t e Water supply in Victoria, Australia
Greater Metropolitan Melbourne dams / reservoirs by capacity	Thomson 1.123 million ML (247 billion imp gal; 297 billion US gal) Cardinia 287,000 ML (63 billion imp gal; 76 billion US gal) Upper Yarra 200,000 ML (44 billion imp gal; 53 billion US gal) Sugarloaf 96,000 ML (21 billion imp gal; 25 billion US gal) Silvan 40,000 ML (8.8 billion imp gal; 11 billion US gal) Tarago 37,500 ML (8.2 billion imp gal; 9.9 billion US gal) Yan Yean 30,000 ML (6.6 billion imp gal; 7.9 billion US gal) Greenvale 27,000 ML (5.9 billion imp gal; 7.1 billion US gal) Maroondah 22,000 ML (4.8 billion imp gal; 5.8 billion US gal) O'Shannassy 3,000 ML (660 million imp gal; 790 million US gal) Anakie Melton Toorourrong
Regional dams / reservoirs	Allen Blue Rock Bostock Dartmouth Eildon Eppalock Glenmaggie Korweinguboora Laanecoorie Lauriston Malsmbury Marengo Moondara Painkalac Rocklands Stony Creek Upper Coliban Waranga Dam West Barwon West Gellibrand and Olangolah Reservoirs and No.4 & No.5 Basins Wurdee Boluc Boga Cairn Curran Catani Guthridge Mokoan Mulwala Nagambie Narracan William Hovell
Other water sources / facilities	Altona Treatment Plant Eastern Treatment Plant Western Treatment Plant Victorian Desalination Plant
Water companies and government agencies	Barwon Water Central Highlands Water Coliban Water Goulburn–Murray Water Goulburn Valley Water Greater Western Water Melbourne Water South East Water (Australia) Southern Rural Water Yarra Valley Water Catchment Management Authority (Victoria) Corangamite CMA East Gippsland CMA Glenelg Hopkins CMA Mallee CMA Port Phillip and Westernport CMA West Gippsland CMA Minister for Water (Victoria)
Historical	William Davidson William Thwaites Bittern Devilbend Terang City West Water

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References